Update module prometheus/client_golang to v0.9.4 (#245)

Update module prometheus/client_golang to v0.9.4 Reviewed-on: vikunja/api#245
2020-04-07 20:42:06 +00:00 · 2020-04-07 20:42:06 +00:00 · dda558fe1c
parent 76f19db6e7
commit dda558fe1c
51 changed files with 3009 additions and 2248 deletions
--- a/go.mod
+++ b/go.mod
@ -55,7 +55,7 @@ require (
 	github.com/olekukonko/tablewriter v0.0.4
 	github.com/op/go-logging v0.0.0-20160315200505-970db520ece7
 	github.com/pelletier/go-toml v1.4.0 // indirect
-	github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829
+	github.com/prometheus/client_golang v0.9.4
 	github.com/samedi/caldav-go v3.0.0+incompatible
 	github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749
 	github.com/shurcooL/vfsgen v0.0.0-20181202132449-6a9ea43bcacd
--- a/go.sum
+++ b/go.sum
@ -40,6 +40,8 @@ github.com/beevik/etree v1.1.0 h1:T0xke/WvNtMoCqgzPhkX2r4rjY3GDZFi+FjpRZY2Jbs=
 github.com/beevik/etree v1.1.0/go.mod h1:r8Aw8JqVegEf0w2fDnATrX9VpkMcyFeM0FhwO62wh+A=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/c2h5oh/datasize v0.0.0-20171227191756-4eba002a5eae h1:2Zmk+8cNvAGuY8AyvZuWpUdpQUAXwfom4ReVMe/CTIo=
 github.com/c2h5oh/datasize v0.0.0-20171227191756-4eba002a5eae/go.mod h1:S/7n9copUssQ56c7aAgHqftWO4LTf4xY6CGWt8Bc+3M=
 github.com/c2h5oh/datasize v0.0.0-20200112174442-28bbd4740fee h1:BnPxIde0gjtTnc9Er7cxvBk8DHLWhEux0SxayC8dP6I=
@ -277,15 +279,23 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829 h1:D+CiwcpGTW6pL6bv6KI3KbyEyCKyS+1JWS2h8PNDnGA=
 github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829/go.mod h1:p2iRAGwDERtqlqzRXnrOVns+ignqQo//hLXqYxZYVNs=
+github.com/prometheus/client_golang v0.9.4 h1:Y8E/JaaPbmFSW2V81Ab/d8yZFYQQGbni1b1jPcG9Y6A=
+github.com/prometheus/client_golang v0.9.4/go.mod h1:oCXIBxdI62A4cR6aTRJCgetEjecSIYzOEaeAn4iYEpM=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910 h1:idejC8f05m9MGOsuEi1ATq9shN03HrxNkD/luQvxCv8=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190115171406-56726106282f h1:BVwpUVJDADN2ufcGik7W992pyps0wZ888b/y9GXcLTU=
 github.com/prometheus/client_model v0.0.0-20190115171406-56726106282f/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
+github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 h1:S/YWwWx/RA8rT8tKFRuGUZhuA90OyIBpPCXkcbwU8DE=
+github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/common v0.2.0 h1:kUZDBDTdBVBYBj5Tmh2NZLlF60mfjA27rM34b+cVwNU=
 github.com/prometheus/common v0.2.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
+github.com/prometheus/common v0.4.1 h1:K0MGApIoQvMw27RTdJkPbr3JZ7DNbtxQNyi5STVM6Kw=
+github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.0-20190117184657-bf6a532e95b1 h1:/K3IL0Z1quvmJ7X0A1AwNEK7CRkVK3YwfOU/QAL4WGg=
 github.com/prometheus/procfs v0.0.0-20190117184657-bf6a532e95b1/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
+github.com/prometheus/procfs v0.0.2 h1:6LJUbpNm42llc4HRCuvApCSWB/WfhuNo9K98Q9sNGfs=
+github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
 github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
--- a/vendor/github.com/prometheus/client_golang/prometheus/build_info.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/build_info.go
@ -0,0 +1,29 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build go1.12
+
+package prometheus
+
+import "runtime/debug"
+
+// readBuildInfo is a wrapper around debug.ReadBuildInfo for Go 1.12+.
+func readBuildInfo() (path, version, sum string) {
+	path, version, sum = "unknown", "unknown", "unknown"
+	if bi, ok := debug.ReadBuildInfo(); ok {
+		path = bi.Main.Path
+		version = bi.Main.Version
+		sum = bi.Main.Sum
+	}
+	return
+}
--- a/vendor/github.com/prometheus/client_golang/prometheus/build_info_pre_1.12.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/build_info_pre_1.12.go
@ -0,0 +1,22 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !go1.12
+
+package prometheus
+
+// readBuildInfo is a wrapper around debug.ReadBuildInfo for Go versions before
+// 1.12. Remove this whole file once the minimum supported Go version is 1.12.
+func readBuildInfo() (path, version, sum string) {
+	return "unknown", "unknown", "unknown"
+}
--- a/vendor/github.com/prometheus/client_golang/prometheus/go_collector.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/go_collector.go
@ -14,9 +14,9 @@
 package prometheus

 import (
-	"fmt"
 	"runtime"
 	"runtime/debug"
+	"sync"
 	"time"
 )

@ -26,16 +26,41 @@ type goCollector struct {
 	gcDesc         *Desc
 	goInfoDesc     *Desc

-	// metrics to describe and collect
-	metrics memStatsMetrics
+	// ms... are memstats related.
+	msLast          *runtime.MemStats // Previously collected memstats.
+	msLastTimestamp time.Time
+	msMtx           sync.Mutex // Protects msLast and msLastTimestamp.
+	msMetrics       memStatsMetrics
+	msRead          func(*runtime.MemStats) // For mocking in tests.
+	msMaxWait       time.Duration           // Wait time for fresh memstats.
+	msMaxAge        time.Duration           // Maximum allowed age of old memstats.
 }

-// NewGoCollector returns a collector which exports metrics about the current Go
+// NewGoCollector returns a collector that exports metrics about the current Go
 // process. This includes memory stats. To collect those, runtime.ReadMemStats
-// is called. This causes a stop-the-world, which is very short with Go1.9+
-// (~25µs). However, with older Go versions, the stop-the-world duration depends
-// on the heap size and can be quite significant (~1.7 ms/GiB as per
+// is called. This requires to “stop the world”, which usually only happens for
+// garbage collection (GC). Take the following implications into account when
+// deciding whether to use the Go collector:
+//
+// 1. The performance impact of stopping the world is the more relevant the more
+// frequently metrics are collected. However, with Go1.9 or later the
+// stop-the-world time per metrics collection is very short (~25µs) so that the
+// performance impact will only matter in rare cases. However, with older Go
+// versions, the stop-the-world duration depends on the heap size and can be
+// quite significant (~1.7 ms/GiB as per
 // https://go-review.googlesource.com/c/go/+/34937).
+//
+// 2. During an ongoing GC, nothing else can stop the world. Therefore, if the
+// metrics collection happens to coincide with GC, it will only complete after
+// GC has finished. Usually, GC is fast enough to not cause problems. However,
+// with a very large heap, GC might take multiple seconds, which is enough to
+// cause scrape timeouts in common setups. To avoid this problem, the Go
+// collector will use the memstats from a previous collection if
+// runtime.ReadMemStats takes more than 1s. However, if there are no previously
+// collected memstats, or their collection is more than 5m ago, the collection
+// will block until runtime.ReadMemStats succeeds. (The problem might be solved
+// in Go1.13, see https://github.com/golang/go/issues/19812 for the related Go
+// issue.)
 func NewGoCollector() Collector {
 	return &goCollector{
 		goroutinesDesc: NewDesc(
@ -54,7 +79,11 @@ func NewGoCollector() Collector {
 			"go_info",
 			"Information about the Go environment.",
 			nil, Labels{"version": runtime.Version()}),
-		metrics: memStatsMetrics{
+		msLast:    &runtime.MemStats{},
+		msRead:    runtime.ReadMemStats,
+		msMaxWait: time.Second,
+		msMaxAge:  5 * time.Minute,
+		msMetrics: memStatsMetrics{
 			{
 				desc: NewDesc(
 					memstatNamespace("alloc_bytes"),
@ -253,7 +282,7 @@ func NewGoCollector() Collector {
 }

 func memstatNamespace(s string) string {
-	return fmt.Sprintf("go_memstats_%s", s)
+	return "go_memstats_" + s
 }

 // Describe returns all descriptions of the collector.
@ -262,13 +291,27 @@ func (c *goCollector) Describe(ch chan<- *Desc) {
 	ch <- c.threadsDesc
 	ch <- c.gcDesc
 	ch <- c.goInfoDesc
-	for _, i := range c.metrics {
+	for _, i := range c.msMetrics {
 		ch <- i.desc
 	}
 }

 // Collect returns the current state of all metrics of the collector.
 func (c *goCollector) Collect(ch chan<- Metric) {
+	var (
+		ms   = &runtime.MemStats{}
+		done = make(chan struct{})
+	)
+	// Start reading memstats first as it might take a while.
+	go func() {
+		c.msRead(ms)
+		c.msMtx.Lock()
+		c.msLast = ms
+		c.msLastTimestamp = time.Now()
+		c.msMtx.Unlock()
+		close(done)
+	}()
+
 	ch <- MustNewConstMetric(c.goroutinesDesc, GaugeValue, float64(runtime.NumGoroutine()))
 	n, _ := runtime.ThreadCreateProfile(nil)
 	ch <- MustNewConstMetric(c.threadsDesc, GaugeValue, float64(n))
@ -286,9 +329,31 @@ func (c *goCollector) Collect(ch chan<- Metric) {

 	ch <- MustNewConstMetric(c.goInfoDesc, GaugeValue, 1)

-	ms := &runtime.MemStats{}
-	runtime.ReadMemStats(ms)
-	for _, i := range c.metrics {
+	timer := time.NewTimer(c.msMaxWait)
+	select {
+	case <-done: // Our own ReadMemStats succeeded in time. Use it.
+		timer.Stop() // Important for high collection frequencies to not pile up timers.
+		c.msCollect(ch, ms)
+		return
+	case <-timer.C: // Time out, use last memstats if possible. Continue below.
+	}
+	c.msMtx.Lock()
+	if time.Since(c.msLastTimestamp) < c.msMaxAge {
+		// Last memstats are recent enough. Collect from them under the lock.
+		c.msCollect(ch, c.msLast)
+		c.msMtx.Unlock()
+		return
+	}
+	// If we are here, the last memstats are too old or don't exist. We have
+	// to wait until our own ReadMemStats finally completes. For that to
+	// happen, we have to release the lock.
+	c.msMtx.Unlock()
+	<-done
+	c.msCollect(ch, ms)
+}
+
+func (c *goCollector) msCollect(ch chan<- Metric, ms *runtime.MemStats) {
+	for _, i := range c.msMetrics {
 		ch <- MustNewConstMetric(i.desc, i.valType, i.eval(ms))
 	}
 }
@ -299,3 +364,33 @@ type memStatsMetrics []struct {
 	eval    func(*runtime.MemStats) float64
 	valType ValueType
 }
+
+// NewBuildInfoCollector returns a collector collecting a single metric
+// "go_build_info" with the constant value 1 and three labels "path", "version",
+// and "checksum". Their label values contain the main module path, version, and
+// checksum, respectively. The labels will only have meaningful values if the
+// binary is built with Go module support and from source code retrieved from
+// the source repository (rather than the local file system). This is usually
+// accomplished by building from outside of GOPATH, specifying the full address
+// of the main package, e.g. "GO111MODULE=on go run
+// github.com/prometheus/client_golang/examples/random". If built without Go
+// module support, all label values will be "unknown". If built with Go module
+// support but using the source code from the local file system, the "path" will
+// be set appropriately, but "checksum" will be empty and "version" will be
+// "(devel)".
+//
+// This collector uses only the build information for the main module. See
+// https://github.com/povilasv/prommod for an example of a collector for the
+// module dependencies.
+func NewBuildInfoCollector() Collector {
+	path, version, sum := readBuildInfo()
+	c := &selfCollector{MustNewConstMetric(
+		NewDesc(
+			"go_build_info",
+			"Build information about the main Go module.",
+			nil, Labels{"path": path, "version": version, "checksum": sum},
+		),
+		GaugeValue, 1)}
+	c.init(c.self)
+	return c
+}
--- a/vendor/github.com/prometheus/client_golang/prometheus/histogram.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/histogram.go
@ -224,18 +224,21 @@ type histogramCounts struct {
 }

 type histogram struct {
-	// countAndHotIdx is a complicated one. For lock-free yet atomic
-	// observations, we need to save the total count of observations again,
-	// combined with the index of the currently-hot counts struct, so that
-	// we can perform the operation on both values atomically. The least
-	// significant bit defines the hot counts struct. The remaining 63 bits
-	// represent the total count of observations. This happens under the
-	// assumption that the 63bit count will never overflow. Rationale: An
-	// observations takes about 30ns. Let's assume it could happen in
-	// 10ns. Overflowing the counter will then take at least (2^63)*10ns,
-	// which is about 3000 years.
+	// countAndHotIdx enables lock-free writes with use of atomic updates.
+	// The most significant bit is the hot index [0 or 1] of the count field
+	// below. Observe calls update the hot one. All remaining bits count the
+	// number of Observe calls. Observe starts by incrementing this counter,
+	// and finish by incrementing the count field in the respective
+	// histogramCounts, as a marker for completion.
 	//
-	// This has to be first in the struct for 64bit alignment. See
+	// Calls of the Write method (which are non-mutating reads from the
+	// perspective of the histogram) swap the hot–cold under the writeMtx
+	// lock. A cooldown is awaited (while locked) by comparing the number of
+	// observations with the initiation count. Once they match, then the
+	// last observation on the now cool one has completed. All cool fields must
+	// be merged into the new hot before releasing writeMtx.
+	//
+	// Fields with atomic access first! See alignment constraint:
 	// http://golang.org/pkg/sync/atomic/#pkg-note-BUG
 	countAndHotIdx uint64

@ -243,16 +246,14 @@ type histogram struct {
 	desc     *Desc
 	writeMtx sync.Mutex // Only used in the Write method.

-	upperBounds []float64
-
 	// Two counts, one is "hot" for lock-free observations, the other is
 	// "cold" for writing out a dto.Metric. It has to be an array of
 	// pointers to guarantee 64bit alignment of the histogramCounts, see
 	// http://golang.org/pkg/sync/atomic/#pkg-note-BUG.
 	counts [2]*histogramCounts
-	hotIdx int // Index of currently-hot counts. Only used within Write.

-	labelPairs []*dto.LabelPair
+	upperBounds []float64
+	labelPairs  []*dto.LabelPair
 }

 func (h *histogram) Desc() *Desc {
@ -271,11 +272,11 @@ func (h *histogram) Observe(v float64) {
 	// 300 buckets: 154 ns/op linear - binary 61.6 ns/op
 	i := sort.SearchFloat64s(h.upperBounds, v)

-	// We increment h.countAndHotIdx by 2 so that the counter in the upper
-	// 63 bits gets incremented by 1. At the same time, we get the new value
+	// We increment h.countAndHotIdx so that the counter in the lower
+	// 63 bits gets incremented. At the same time, we get the new value
 	// back, which we can use to find the currently-hot counts.
-	n := atomic.AddUint64(&h.countAndHotIdx, 2)
-	hotCounts := h.counts[n%2]
+	n := atomic.AddUint64(&h.countAndHotIdx, 1)
+	hotCounts := h.counts[n>>63]

 	if i < len(h.upperBounds) {
 		atomic.AddUint64(&hotCounts.buckets[i], 1)
@ -293,72 +294,43 @@ func (h *histogram) Observe(v float64) {
 }

 func (h *histogram) Write(out *dto.Metric) error {
-	var (
-		his                   = &dto.Histogram{}
-		buckets               = make([]*dto.Bucket, len(h.upperBounds))
-		hotCounts, coldCounts *histogramCounts
-		count                 uint64
-	)
-
-	// For simplicity, we mutex the rest of this method. It is not in the
-	// hot path, i.e.  Observe is called much more often than Write. The
-	// complication of making Write lock-free isn't worth it.
+	// For simplicity, we protect this whole method by a mutex. It is not in
+	// the hot path, i.e. Observe is called much more often than Write. The
+	// complication of making Write lock-free isn't worth it, if possible at
+	// all.
 	h.writeMtx.Lock()
 	defer h.writeMtx.Unlock()

-	// This is a bit arcane, which is why the following spells out this if
-	// clause in English:
-	//
-	// If the currently-hot counts struct is #0, we atomically increment
-	// h.countAndHotIdx by 1 so that from now on Observe will use the counts
-	// struct #1. Furthermore, the atomic increment gives us the new value,
-	// which, in its most significant 63 bits, tells us the count of
-	// observations done so far up to and including currently ongoing
-	// observations still using the counts struct just changed from hot to
-	// cold. To have a normal uint64 for the count, we bitshift by 1 and
-	// save the result in count. We also set h.hotIdx to 1 for the next
-	// Write call, and we will refer to counts #1 as hotCounts and to counts
-	// #0 as coldCounts.
-	//
-	// If the currently-hot counts struct is #1, we do the corresponding
-	// things the other way round. We have to _decrement_ h.countAndHotIdx
-	// (which is a bit arcane in itself, as we have to express -1 with an
-	// unsigned int...).
-	if h.hotIdx == 0 {
-		count = atomic.AddUint64(&h.countAndHotIdx, 1) >> 1
-		h.hotIdx = 1
-		hotCounts = h.counts[1]
-		coldCounts = h.counts[0]
-	} else {
-		count = atomic.AddUint64(&h.countAndHotIdx, ^uint64(0)) >> 1 // Decrement.
-		h.hotIdx = 0
-		hotCounts = h.counts[0]
-		coldCounts = h.counts[1]
-	}
+	// Adding 1<<63 switches the hot index (from 0 to 1 or from 1 to 0)
+	// without touching the count bits. See the struct comments for a full
+	// description of the algorithm.
+	n := atomic.AddUint64(&h.countAndHotIdx, 1<<63)
+	// count is contained unchanged in the lower 63 bits.
+	count := n & ((1 << 63) - 1)
+	// The most significant bit tells us which counts is hot. The complement
+	// is thus the cold one.
+	hotCounts := h.counts[n>>63]
+	coldCounts := h.counts[(^n)>>63]

-	// Now we have to wait for the now-declared-cold counts to actually cool
-	// down, i.e. wait for all observations still using it to finish. That's
-	// the case once the count in the cold counts struct is the same as the
-	// one atomically retrieved from the upper 63bits of h.countAndHotIdx.
-	for {
-		if count == atomic.LoadUint64(&coldCounts.count) {
-			break
-		}
+	// Await cooldown.
+	for count != atomic.LoadUint64(&coldCounts.count) {
 		runtime.Gosched() // Let observations get work done.
 	}

-	his.SampleCount = proto.Uint64(count)
-	his.SampleSum = proto.Float64(math.Float64frombits(atomic.LoadUint64(&coldCounts.sumBits)))
+	his := &dto.Histogram{
+		Bucket:      make([]*dto.Bucket, len(h.upperBounds)),
+		SampleCount: proto.Uint64(count),
+		SampleSum:   proto.Float64(math.Float64frombits(atomic.LoadUint64(&coldCounts.sumBits))),
+	}
 	var cumCount uint64
 	for i, upperBound := range h.upperBounds {
 		cumCount += atomic.LoadUint64(&coldCounts.buckets[i])
-		buckets[i] = &dto.Bucket{
+		his.Bucket[i] = &dto.Bucket{
 			CumulativeCount: proto.Uint64(cumCount),
 			UpperBound:      proto.Float64(upperBound),
 		}
 	}

-	his.Bucket = buckets
 	out.Histogram = his
 	out.Label = h.labelPairs

--- a/vendor/github.com/prometheus/client_golang/prometheus/http.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/http.go
@ -330,6 +330,8 @@ type fancyResponseWriterDelegator struct {
 }

 func (f *fancyResponseWriterDelegator) CloseNotify() <-chan bool {
+	//lint:ignore SA1019 http.CloseNotifier is deprecated but we don't want to
+	//remove support from client_golang yet.
 	return f.ResponseWriter.(http.CloseNotifier).CloseNotify()
 }

--- a/vendor/github.com/prometheus/client_golang/prometheus/process_collector.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/process_collector.go
@ -126,7 +126,7 @@ func NewProcessCollector(opts ProcessCollectorOpts) Collector {
 	}

 	// Set up process metric collection if supported by the runtime.
-	if _, err := procfs.NewStat(); err == nil {
+	if _, err := procfs.NewDefaultFS(); err == nil {
 		c.collectFn = c.processCollect
 	} else {
 		c.collectFn = func(ch chan<- Metric) {
@ -166,7 +166,7 @@ func (c *processCollector) processCollect(ch chan<- Metric) {
 		return
 	}

-	if stat, err := p.NewStat(); err == nil {
+	if stat, err := p.Stat(); err == nil {
 		ch <- MustNewConstMetric(c.cpuTotal, CounterValue, stat.CPUTime())
 		ch <- MustNewConstMetric(c.vsize, GaugeValue, float64(stat.VirtualMemory()))
 		ch <- MustNewConstMetric(c.rss, GaugeValue, float64(stat.ResidentMemory()))
@ -185,7 +185,7 @@ func (c *processCollector) processCollect(ch chan<- Metric) {
 		c.reportError(ch, c.openFDs, err)
 	}

-	if limits, err := p.NewLimits(); err == nil {
+	if limits, err := p.Limits(); err == nil {
 		ch <- MustNewConstMetric(c.maxFDs, GaugeValue, float64(limits.OpenFiles))
 		ch <- MustNewConstMetric(c.maxVsize, GaugeValue, float64(limits.AddressSpace))
 	} else {
--- a/vendor/github.com/prometheus/client_golang/prometheus/promhttp/delegator.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/promhttp/delegator.go
@ -74,8 +74,11 @@ type closeNotifierDelegator struct{ *responseWriterDelegator }
 type flusherDelegator struct{ *responseWriterDelegator }
 type hijackerDelegator struct{ *responseWriterDelegator }
 type readerFromDelegator struct{ *responseWriterDelegator }
+type pusherDelegator struct{ *responseWriterDelegator }

 func (d closeNotifierDelegator) CloseNotify() <-chan bool {
+	//lint:ignore SA1019 http.CloseNotifier is deprecated but we don't want to
+	//remove support from client_golang yet.
 	return d.ResponseWriter.(http.CloseNotifier).CloseNotify()
 }
 func (d flusherDelegator) Flush() {
@ -92,6 +95,9 @@ func (d readerFromDelegator) ReadFrom(re io.Reader) (int64, error) {
 	d.written += n
 	return n, err
 }
+func (d pusherDelegator) Push(target string, opts *http.PushOptions) error {
+	return d.ResponseWriter.(http.Pusher).Push(target, opts)
+}

 var pickDelegator = make([]func(*responseWriterDelegator) delegator, 32)

@ -195,4 +201,157 @@ func init() {
 			http.CloseNotifier
 		}{d, readerFromDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}}
 	}
+	pickDelegator[pusher] = func(d *responseWriterDelegator) delegator { // 16
+		return pusherDelegator{d}
+	}
+	pickDelegator[pusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 17
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			http.CloseNotifier
+		}{d, pusherDelegator{d}, closeNotifierDelegator{d}}
+	}
+	pickDelegator[pusher+flusher] = func(d *responseWriterDelegator) delegator { // 18
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			http.Flusher
+		}{d, pusherDelegator{d}, flusherDelegator{d}}
+	}
+	pickDelegator[pusher+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 19
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			http.Flusher
+			http.CloseNotifier
+		}{d, pusherDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}}
+	}
+	pickDelegator[pusher+hijacker] = func(d *responseWriterDelegator) delegator { // 20
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			http.Hijacker
+		}{d, pusherDelegator{d}, hijackerDelegator{d}}
+	}
+	pickDelegator[pusher+hijacker+closeNotifier] = func(d *responseWriterDelegator) delegator { // 21
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			http.Hijacker
+			http.CloseNotifier
+		}{d, pusherDelegator{d}, hijackerDelegator{d}, closeNotifierDelegator{d}}
+	}
+	pickDelegator[pusher+hijacker+flusher] = func(d *responseWriterDelegator) delegator { // 22
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			http.Hijacker
+			http.Flusher
+		}{d, pusherDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}}
+	}
+	pickDelegator[pusher+hijacker+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { //23
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			http.Hijacker
+			http.Flusher
+			http.CloseNotifier
+		}{d, pusherDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}}
+	}
+	pickDelegator[pusher+readerFrom] = func(d *responseWriterDelegator) delegator { // 24
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			io.ReaderFrom
+		}{d, pusherDelegator{d}, readerFromDelegator{d}}
+	}
+	pickDelegator[pusher+readerFrom+closeNotifier] = func(d *responseWriterDelegator) delegator { // 25
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			io.ReaderFrom
+			http.CloseNotifier
+		}{d, pusherDelegator{d}, readerFromDelegator{d}, closeNotifierDelegator{d}}
+	}
+	pickDelegator[pusher+readerFrom+flusher] = func(d *responseWriterDelegator) delegator { // 26
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			io.ReaderFrom
+			http.Flusher
+		}{d, pusherDelegator{d}, readerFromDelegator{d}, flusherDelegator{d}}
+	}
+	pickDelegator[pusher+readerFrom+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 27
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			io.ReaderFrom
+			http.Flusher
+			http.CloseNotifier
+		}{d, pusherDelegator{d}, readerFromDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}}
+	}
+	pickDelegator[pusher+readerFrom+hijacker] = func(d *responseWriterDelegator) delegator { // 28
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			io.ReaderFrom
+			http.Hijacker
+		}{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}}
+	}
+	pickDelegator[pusher+readerFrom+hijacker+closeNotifier] = func(d *responseWriterDelegator) delegator { // 29
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			io.ReaderFrom
+			http.Hijacker
+			http.CloseNotifier
+		}{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}, closeNotifierDelegator{d}}
+	}
+	pickDelegator[pusher+readerFrom+hijacker+flusher] = func(d *responseWriterDelegator) delegator { // 30
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			io.ReaderFrom
+			http.Hijacker
+			http.Flusher
+		}{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}}
+	}
+	pickDelegator[pusher+readerFrom+hijacker+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 31
+		return struct {
+			*responseWriterDelegator
+			http.Pusher
+			io.ReaderFrom
+			http.Hijacker
+			http.Flusher
+			http.CloseNotifier
+		}{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}}
+	}
+}
+
+func newDelegator(w http.ResponseWriter, observeWriteHeaderFunc func(int)) delegator {
+	d := &responseWriterDelegator{
+		ResponseWriter:     w,
+		observeWriteHeader: observeWriteHeaderFunc,
+	}
+
+	id := 0
+	//lint:ignore SA1019 http.CloseNotifier is deprecated but we don't want to
+	//remove support from client_golang yet.
+	if _, ok := w.(http.CloseNotifier); ok {
+		id += closeNotifier
+	}
+	if _, ok := w.(http.Flusher); ok {
+		id += flusher
+	}
+	if _, ok := w.(http.Hijacker); ok {
+		id += hijacker
+	}
+	if _, ok := w.(io.ReaderFrom); ok {
+		id += readerFrom
+	}
+	if _, ok := w.(http.Pusher); ok {
+		id += pusher
+	}
+
+	return pickDelegator[id](d)
 }
--- a/vendor/github.com/prometheus/client_golang/prometheus/promhttp/delegator_1_8.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/promhttp/delegator_1_8.go
@ -1,181 +0,0 @@
-// Copyright 2017 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build go1.8
-
-package promhttp
-
-import (
-	"io"
-	"net/http"
-)
-
-type pusherDelegator struct{ *responseWriterDelegator }
-
-func (d pusherDelegator) Push(target string, opts *http.PushOptions) error {
-	return d.ResponseWriter.(http.Pusher).Push(target, opts)
-}
-
-func init() {
-	pickDelegator[pusher] = func(d *responseWriterDelegator) delegator { // 16
-		return pusherDelegator{d}
-	}
-	pickDelegator[pusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 17
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			http.CloseNotifier
-		}{d, pusherDelegator{d}, closeNotifierDelegator{d}}
-	}
-	pickDelegator[pusher+flusher] = func(d *responseWriterDelegator) delegator { // 18
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			http.Flusher
-		}{d, pusherDelegator{d}, flusherDelegator{d}}
-	}
-	pickDelegator[pusher+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 19
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			http.Flusher
-			http.CloseNotifier
-		}{d, pusherDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}}
-	}
-	pickDelegator[pusher+hijacker] = func(d *responseWriterDelegator) delegator { // 20
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			http.Hijacker
-		}{d, pusherDelegator{d}, hijackerDelegator{d}}
-	}
-	pickDelegator[pusher+hijacker+closeNotifier] = func(d *responseWriterDelegator) delegator { // 21
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			http.Hijacker
-			http.CloseNotifier
-		}{d, pusherDelegator{d}, hijackerDelegator{d}, closeNotifierDelegator{d}}
-	}
-	pickDelegator[pusher+hijacker+flusher] = func(d *responseWriterDelegator) delegator { // 22
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			http.Hijacker
-			http.Flusher
-		}{d, pusherDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}}
-	}
-	pickDelegator[pusher+hijacker+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { //23
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			http.Hijacker
-			http.Flusher
-			http.CloseNotifier
-		}{d, pusherDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}}
-	}
-	pickDelegator[pusher+readerFrom] = func(d *responseWriterDelegator) delegator { // 24
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			io.ReaderFrom
-		}{d, pusherDelegator{d}, readerFromDelegator{d}}
-	}
-	pickDelegator[pusher+readerFrom+closeNotifier] = func(d *responseWriterDelegator) delegator { // 25
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			io.ReaderFrom
-			http.CloseNotifier
-		}{d, pusherDelegator{d}, readerFromDelegator{d}, closeNotifierDelegator{d}}
-	}
-	pickDelegator[pusher+readerFrom+flusher] = func(d *responseWriterDelegator) delegator { // 26
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			io.ReaderFrom
-			http.Flusher
-		}{d, pusherDelegator{d}, readerFromDelegator{d}, flusherDelegator{d}}
-	}
-	pickDelegator[pusher+readerFrom+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 27
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			io.ReaderFrom
-			http.Flusher
-			http.CloseNotifier
-		}{d, pusherDelegator{d}, readerFromDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}}
-	}
-	pickDelegator[pusher+readerFrom+hijacker] = func(d *responseWriterDelegator) delegator { // 28
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			io.ReaderFrom
-			http.Hijacker
-		}{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}}
-	}
-	pickDelegator[pusher+readerFrom+hijacker+closeNotifier] = func(d *responseWriterDelegator) delegator { // 29
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			io.ReaderFrom
-			http.Hijacker
-			http.CloseNotifier
-		}{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}, closeNotifierDelegator{d}}
-	}
-	pickDelegator[pusher+readerFrom+hijacker+flusher] = func(d *responseWriterDelegator) delegator { // 30
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			io.ReaderFrom
-			http.Hijacker
-			http.Flusher
-		}{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}}
-	}
-	pickDelegator[pusher+readerFrom+hijacker+flusher+closeNotifier] = func(d *responseWriterDelegator) delegator { // 31
-		return struct {
-			*responseWriterDelegator
-			http.Pusher
-			io.ReaderFrom
-			http.Hijacker
-			http.Flusher
-			http.CloseNotifier
-		}{d, pusherDelegator{d}, readerFromDelegator{d}, hijackerDelegator{d}, flusherDelegator{d}, closeNotifierDelegator{d}}
-	}
-}
-
-func newDelegator(w http.ResponseWriter, observeWriteHeaderFunc func(int)) delegator {
-	d := &responseWriterDelegator{
-		ResponseWriter:     w,
-		observeWriteHeader: observeWriteHeaderFunc,
-	}
-
-	id := 0
-	if _, ok := w.(http.CloseNotifier); ok {
-		id += closeNotifier
-	}
-	if _, ok := w.(http.Flusher); ok {
-		id += flusher
-	}
-	if _, ok := w.(http.Hijacker); ok {
-		id += hijacker
-	}
-	if _, ok := w.(io.ReaderFrom); ok {
-		id += readerFrom
-	}
-	if _, ok := w.(http.Pusher); ok {
-		id += pusher
-	}
-
-	return pickDelegator[id](d)
-}
--- a/vendor/github.com/prometheus/client_golang/prometheus/promhttp/delegator_pre_1_8.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/promhttp/delegator_pre_1_8.go
@ -1,44 +0,0 @@
-// Copyright 2017 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build !go1.8
-
-package promhttp
-
-import (
-	"io"
-	"net/http"
-)
-
-func newDelegator(w http.ResponseWriter, observeWriteHeaderFunc func(int)) delegator {
-	d := &responseWriterDelegator{
-		ResponseWriter:     w,
-		observeWriteHeader: observeWriteHeaderFunc,
-	}
-
-	id := 0
-	if _, ok := w.(http.CloseNotifier); ok {
-		id += closeNotifier
-	}
-	if _, ok := w.(http.Flusher); ok {
-		id += flusher
-	}
-	if _, ok := w.(http.Hijacker); ok {
-		id += hijacker
-	}
-	if _, ok := w.(io.ReaderFrom); ok {
-		id += readerFrom
-	}
-
-	return pickDelegator[id](d)
-}
--- a/vendor/github.com/prometheus/client_golang/prometheus/promhttp/http.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/promhttp/http.go
@ -84,10 +84,32 @@ func Handler() http.Handler {
 // instrumentation. Use the InstrumentMetricHandler function to apply the same
 // kind of instrumentation as it is used by the Handler function.
 func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
-	var inFlightSem chan struct{}
+	var (
+		inFlightSem chan struct{}
+		errCnt      = prometheus.NewCounterVec(
+			prometheus.CounterOpts{
+				Name: "promhttp_metric_handler_errors_total",
+				Help: "Total number of internal errors encountered by the promhttp metric handler.",
+			},
+			[]string{"cause"},
+		)
+	)
+
 	if opts.MaxRequestsInFlight > 0 {
 		inFlightSem = make(chan struct{}, opts.MaxRequestsInFlight)
 	}
+	if opts.Registry != nil {
+		// Initialize all possibilites that can occur below.
+		errCnt.WithLabelValues("gathering")
+		errCnt.WithLabelValues("encoding")
+		if err := opts.Registry.Register(errCnt); err != nil {
+			if are, ok := err.(prometheus.AlreadyRegisteredError); ok {
+				errCnt = are.ExistingCollector.(*prometheus.CounterVec)
+			} else {
+				panic(err)
+			}
+		}
+	}

 	h := http.HandlerFunc(func(rsp http.ResponseWriter, req *http.Request) {
 		if inFlightSem != nil {
@ -106,6 +128,7 @@ func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
 			if opts.ErrorLog != nil {
 				opts.ErrorLog.Println("error gathering metrics:", err)
 			}
+			errCnt.WithLabelValues("gathering").Inc()
 			switch opts.ErrorHandling {
 			case PanicOnError:
 				panic(err)
@ -146,6 +169,7 @@ func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
 				if opts.ErrorLog != nil {
 					opts.ErrorLog.Println("error encoding and sending metric family:", err)
 				}
+				errCnt.WithLabelValues("encoding").Inc()
 				switch opts.ErrorHandling {
 				case PanicOnError:
 					panic(err)
@ -236,9 +260,12 @@ const (
 	// Ignore errors and try to serve as many metrics as possible.  However,
 	// if no metrics can be served, serve an HTTP status code 500 and the
 	// last error message in the body. Only use this in deliberate "best
-	// effort" metrics collection scenarios. It is recommended to at least
-	// log errors (by providing an ErrorLog in HandlerOpts) to not mask
-	// errors completely.
+	// effort" metrics collection scenarios. In this case, it is highly
+	// recommended to provide other means of detecting errors: By setting an
+	// ErrorLog in HandlerOpts, the errors are logged. By providing a
+	// Registry in HandlerOpts, the exposed metrics include an error counter
+	// "promhttp_metric_handler_errors_total", which can be used for
+	// alerts.
 	ContinueOnError
 	// Panic upon the first error encountered (useful for "crash only" apps).
 	PanicOnError
@ -261,6 +288,18 @@ type HandlerOpts struct {
 	// logged regardless of the configured ErrorHandling provided ErrorLog
 	// is not nil.
 	ErrorHandling HandlerErrorHandling
+	// If Registry is not nil, it is used to register a metric
+	// "promhttp_metric_handler_errors_total", partitioned by "cause". A
+	// failed registration causes a panic. Note that this error counter is
+	// different from the instrumentation you get from the various
+	// InstrumentHandler... helpers. It counts errors that don't necessarily
+	// result in a non-2xx HTTP status code. There are two typical cases:
+	// (1) Encoding errors that only happen after streaming of the HTTP body
+	// has already started (and the status code 200 has been sent). This
+	// should only happen with custom collectors. (2) Collection errors with
+	// no effect on the HTTP status code because ErrorHandling is set to
+	// ContinueOnError.
+	Registry prometheus.Registerer
 	// If DisableCompression is true, the handler will never compress the
 	// response, even if requested by the client.
 	DisableCompression bool
--- a/vendor/github.com/prometheus/client_golang/prometheus/promhttp/instrument_client.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/promhttp/instrument_client.go
@ -14,7 +14,9 @@
 package promhttp

 import (
+	"crypto/tls"
 	"net/http"
+	"net/http/httptrace"
 	"time"

 	"github.com/prometheus/client_golang/prometheus"
@ -95,3 +97,123 @@ func InstrumentRoundTripperDuration(obs prometheus.ObserverVec, next http.RoundT
 		return resp, err
 	})
 }
+
+// InstrumentTrace is used to offer flexibility in instrumenting the available
+// httptrace.ClientTrace hook functions. Each function is passed a float64
+// representing the time in seconds since the start of the http request. A user
+// may choose to use separately buckets Histograms, or implement custom
+// instance labels on a per function basis.
+type InstrumentTrace struct {
+	GotConn              func(float64)
+	PutIdleConn          func(float64)
+	GotFirstResponseByte func(float64)
+	Got100Continue       func(float64)
+	DNSStart             func(float64)
+	DNSDone              func(float64)
+	ConnectStart         func(float64)
+	ConnectDone          func(float64)
+	TLSHandshakeStart    func(float64)
+	TLSHandshakeDone     func(float64)
+	WroteHeaders         func(float64)
+	Wait100Continue      func(float64)
+	WroteRequest         func(float64)
+}
+
+// InstrumentRoundTripperTrace is a middleware that wraps the provided
+// RoundTripper and reports times to hook functions provided in the
+// InstrumentTrace struct. Hook functions that are not present in the provided
+// InstrumentTrace struct are ignored. Times reported to the hook functions are
+// time since the start of the request. Only with Go1.9+, those times are
+// guaranteed to never be negative. (Earlier Go versions are not using a
+// monotonic clock.) Note that partitioning of Histograms is expensive and
+// should be used judiciously.
+//
+// For hook functions that receive an error as an argument, no observations are
+// made in the event of a non-nil error value.
+//
+// See the example for ExampleInstrumentRoundTripperDuration for example usage.
+func InstrumentRoundTripperTrace(it *InstrumentTrace, next http.RoundTripper) RoundTripperFunc {
+	return RoundTripperFunc(func(r *http.Request) (*http.Response, error) {
+		start := time.Now()
+
+		trace := &httptrace.ClientTrace{
+			GotConn: func(_ httptrace.GotConnInfo) {
+				if it.GotConn != nil {
+					it.GotConn(time.Since(start).Seconds())
+				}
+			},
+			PutIdleConn: func(err error) {
+				if err != nil {
+					return
+				}
+				if it.PutIdleConn != nil {
+					it.PutIdleConn(time.Since(start).Seconds())
+				}
+			},
+			DNSStart: func(_ httptrace.DNSStartInfo) {
+				if it.DNSStart != nil {
+					it.DNSStart(time.Since(start).Seconds())
+				}
+			},
+			DNSDone: func(_ httptrace.DNSDoneInfo) {
+				if it.DNSDone != nil {
+					it.DNSDone(time.Since(start).Seconds())
+				}
+			},
+			ConnectStart: func(_, _ string) {
+				if it.ConnectStart != nil {
+					it.ConnectStart(time.Since(start).Seconds())
+				}
+			},
+			ConnectDone: func(_, _ string, err error) {
+				if err != nil {
+					return
+				}
+				if it.ConnectDone != nil {
+					it.ConnectDone(time.Since(start).Seconds())
+				}
+			},
+			GotFirstResponseByte: func() {
+				if it.GotFirstResponseByte != nil {
+					it.GotFirstResponseByte(time.Since(start).Seconds())
+				}
+			},
+			Got100Continue: func() {
+				if it.Got100Continue != nil {
+					it.Got100Continue(time.Since(start).Seconds())
+				}
+			},
+			TLSHandshakeStart: func() {
+				if it.TLSHandshakeStart != nil {
+					it.TLSHandshakeStart(time.Since(start).Seconds())
+				}
+			},
+			TLSHandshakeDone: func(_ tls.ConnectionState, err error) {
+				if err != nil {
+					return
+				}
+				if it.TLSHandshakeDone != nil {
+					it.TLSHandshakeDone(time.Since(start).Seconds())
+				}
+			},
+			WroteHeaders: func() {
+				if it.WroteHeaders != nil {
+					it.WroteHeaders(time.Since(start).Seconds())
+				}
+			},
+			Wait100Continue: func() {
+				if it.Wait100Continue != nil {
+					it.Wait100Continue(time.Since(start).Seconds())
+				}
+			},
+			WroteRequest: func(_ httptrace.WroteRequestInfo) {
+				if it.WroteRequest != nil {
+					it.WroteRequest(time.Since(start).Seconds())
+				}
+			},
+		}
+		r = r.WithContext(httptrace.WithClientTrace(r.Context(), trace))
+
+		return next.RoundTrip(r)
+	})
+}
--- a/vendor/github.com/prometheus/client_golang/prometheus/promhttp/instrument_client_1_8.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/promhttp/instrument_client_1_8.go
@ -1,144 +0,0 @@
-// Copyright 2017 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build go1.8
-
-package promhttp
-
-import (
-	"context"
-	"crypto/tls"
-	"net/http"
-	"net/http/httptrace"
-	"time"
-)
-
-// InstrumentTrace is used to offer flexibility in instrumenting the available
-// httptrace.ClientTrace hook functions. Each function is passed a float64
-// representing the time in seconds since the start of the http request. A user
-// may choose to use separately buckets Histograms, or implement custom
-// instance labels on a per function basis.
-type InstrumentTrace struct {
-	GotConn              func(float64)
-	PutIdleConn          func(float64)
-	GotFirstResponseByte func(float64)
-	Got100Continue       func(float64)
-	DNSStart             func(float64)
-	DNSDone              func(float64)
-	ConnectStart         func(float64)
-	ConnectDone          func(float64)
-	TLSHandshakeStart    func(float64)
-	TLSHandshakeDone     func(float64)
-	WroteHeaders         func(float64)
-	Wait100Continue      func(float64)
-	WroteRequest         func(float64)
-}
-
-// InstrumentRoundTripperTrace is a middleware that wraps the provided
-// RoundTripper and reports times to hook functions provided in the
-// InstrumentTrace struct. Hook functions that are not present in the provided
-// InstrumentTrace struct are ignored. Times reported to the hook functions are
-// time since the start of the request. Only with Go1.9+, those times are
-// guaranteed to never be negative. (Earlier Go versions are not using a
-// monotonic clock.) Note that partitioning of Histograms is expensive and
-// should be used judiciously.
-//
-// For hook functions that receive an error as an argument, no observations are
-// made in the event of a non-nil error value.
-//
-// See the example for ExampleInstrumentRoundTripperDuration for example usage.
-func InstrumentRoundTripperTrace(it *InstrumentTrace, next http.RoundTripper) RoundTripperFunc {
-	return RoundTripperFunc(func(r *http.Request) (*http.Response, error) {
-		start := time.Now()
-
-		trace := &httptrace.ClientTrace{
-			GotConn: func(_ httptrace.GotConnInfo) {
-				if it.GotConn != nil {
-					it.GotConn(time.Since(start).Seconds())
-				}
-			},
-			PutIdleConn: func(err error) {
-				if err != nil {
-					return
-				}
-				if it.PutIdleConn != nil {
-					it.PutIdleConn(time.Since(start).Seconds())
-				}
-			},
-			DNSStart: func(_ httptrace.DNSStartInfo) {
-				if it.DNSStart != nil {
-					it.DNSStart(time.Since(start).Seconds())
-				}
-			},
-			DNSDone: func(_ httptrace.DNSDoneInfo) {
-				if it.DNSDone != nil {
-					it.DNSDone(time.Since(start).Seconds())
-				}
-			},
-			ConnectStart: func(_, _ string) {
-				if it.ConnectStart != nil {
-					it.ConnectStart(time.Since(start).Seconds())
-				}
-			},
-			ConnectDone: func(_, _ string, err error) {
-				if err != nil {
-					return
-				}
-				if it.ConnectDone != nil {
-					it.ConnectDone(time.Since(start).Seconds())
-				}
-			},
-			GotFirstResponseByte: func() {
-				if it.GotFirstResponseByte != nil {
-					it.GotFirstResponseByte(time.Since(start).Seconds())
-				}
-			},
-			Got100Continue: func() {
-				if it.Got100Continue != nil {
-					it.Got100Continue(time.Since(start).Seconds())
-				}
-			},
-			TLSHandshakeStart: func() {
-				if it.TLSHandshakeStart != nil {
-					it.TLSHandshakeStart(time.Since(start).Seconds())
-				}
-			},
-			TLSHandshakeDone: func(_ tls.ConnectionState, err error) {
-				if err != nil {
-					return
-				}
-				if it.TLSHandshakeDone != nil {
-					it.TLSHandshakeDone(time.Since(start).Seconds())
-				}
-			},
-			WroteHeaders: func() {
-				if it.WroteHeaders != nil {
-					it.WroteHeaders(time.Since(start).Seconds())
-				}
-			},
-			Wait100Continue: func() {
-				if it.Wait100Continue != nil {
-					it.Wait100Continue(time.Since(start).Seconds())
-				}
-			},
-			WroteRequest: func(_ httptrace.WroteRequestInfo) {
-				if it.WroteRequest != nil {
-					it.WroteRequest(time.Since(start).Seconds())
-				}
-			},
-		}
-		r = r.WithContext(httptrace.WithClientTrace(context.Background(), trace))
-
-		return next.RoundTrip(r)
-	})
-}
--- a/vendor/github.com/prometheus/client_golang/prometheus/summary.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/summary.go
@ -39,7 +39,7 @@ const quantileLabel = "quantile"
 // A typical use-case is the observation of request latencies. By default, a
 // Summary provides the median, the 90th and the 99th percentile of the latency
 // as rank estimations. However, the default behavior will change in the
-// upcoming v0.10 of the library. There will be no rank estimations at all by
+// upcoming v1.0.0 of the library. There will be no rank estimations at all by
 // default. For a sane transition, it is recommended to set the desired rank
 // estimations explicitly.
 //
@ -61,7 +61,7 @@ type Summary interface {
 // DefObjectives are the default Summary quantile values.
 //
 // Deprecated: DefObjectives will not be used as the default objectives in
-// v0.10 of the library. The default Summary will have no quantiles then.
+// v1.0.0 of the library. The default Summary will have no quantiles then.
 var (
 	DefObjectives = map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001}

@ -86,7 +86,7 @@ const (
 // mandatory to set Name to a non-empty string. While all other fields are
 // optional and can safely be left at their zero value, it is recommended to set
 // a help string and to explicitly set the Objectives field to the desired value
-// as the default value will change in the upcoming v0.10 of the library.
+// as the default value will change in the upcoming v1.0.0 of the library.
 type SummaryOpts struct {
 	// Namespace, Subsystem, and Name are components of the fully-qualified
 	// name of the Summary (created by joining these components with
@ -127,9 +127,10 @@ type SummaryOpts struct {
 	// its zero value (i.e. nil). To create a Summary without Objectives,
 	// set it to an empty map (i.e. map[float64]float64{}).
 	//
-	// Deprecated: Note that the current value of DefObjectives is
-	// deprecated. It will be replaced by an empty map in v0.10 of the
-	// library. Please explicitly set Objectives to the desired value.
+	// Note that the current value of DefObjectives is deprecated. It will
+	// be replaced by an empty map in v1.0.0 of the library. Please
+	// explicitly set Objectives to the desired value to avoid problems
+	// during the transition.
 	Objectives map[float64]float64

 	// MaxAge defines the duration for which an observation stays relevant
@ -405,18 +406,21 @@ type summaryCounts struct {
 }

 type noObjectivesSummary struct {
-	// countAndHotIdx is a complicated one. For lock-free yet atomic
-	// observations, we need to save the total count of observations again,
-	// combined with the index of the currently-hot counts struct, so that
-	// we can perform the operation on both values atomically. The least
-	// significant bit defines the hot counts struct. The remaining 63 bits
-	// represent the total count of observations. This happens under the
-	// assumption that the 63bit count will never overflow. Rationale: An
-	// observations takes about 30ns. Let's assume it could happen in
-	// 10ns. Overflowing the counter will then take at least (2^63)*10ns,
-	// which is about 3000 years.
+	// countAndHotIdx enables lock-free writes with use of atomic updates.
+	// The most significant bit is the hot index [0 or 1] of the count field
+	// below. Observe calls update the hot one. All remaining bits count the
+	// number of Observe calls. Observe starts by incrementing this counter,
+	// and finish by incrementing the count field in the respective
+	// summaryCounts, as a marker for completion.
 	//
-	// This has to be first in the struct for 64bit alignment. See
+	// Calls of the Write method (which are non-mutating reads from the
+	// perspective of the summary) swap the hot–cold under the writeMtx
+	// lock. A cooldown is awaited (while locked) by comparing the number of
+	// observations with the initiation count. Once they match, then the
+	// last observation on the now cool one has completed. All cool fields must
+	// be merged into the new hot before releasing writeMtx.
+
+	// Fields with atomic access first! See alignment constraint:
 	// http://golang.org/pkg/sync/atomic/#pkg-note-BUG
 	countAndHotIdx uint64

@ -429,7 +433,6 @@ type noObjectivesSummary struct {
 	// pointers to guarantee 64bit alignment of the histogramCounts, see
 	// http://golang.org/pkg/sync/atomic/#pkg-note-BUG.
 	counts [2]*summaryCounts
-	hotIdx int // Index of currently-hot counts. Only used within Write.

 	labelPairs []*dto.LabelPair
 }
@ -439,11 +442,11 @@ func (s *noObjectivesSummary) Desc() *Desc {
 }

 func (s *noObjectivesSummary) Observe(v float64) {
-	// We increment s.countAndHotIdx by 2 so that the counter in the upper
-	// 63 bits gets incremented by 1. At the same time, we get the new value
+	// We increment h.countAndHotIdx so that the counter in the lower
+	// 63 bits gets incremented. At the same time, we get the new value
 	// back, which we can use to find the currently-hot counts.
-	n := atomic.AddUint64(&s.countAndHotIdx, 2)
-	hotCounts := s.counts[n%2]
+	n := atomic.AddUint64(&s.countAndHotIdx, 1)
+	hotCounts := s.counts[n>>63]

 	for {
 		oldBits := atomic.LoadUint64(&hotCounts.sumBits)
@ -458,61 +461,33 @@ func (s *noObjectivesSummary) Observe(v float64) {
 }

 func (s *noObjectivesSummary) Write(out *dto.Metric) error {
-	var (
-		sum                   = &dto.Summary{}
-		hotCounts, coldCounts *summaryCounts
-		count                 uint64
-	)
-
-	// For simplicity, we mutex the rest of this method. It is not in the
-	// hot path, i.e.  Observe is called much more often than Write. The
-	// complication of making Write lock-free isn't worth it.
+	// For simplicity, we protect this whole method by a mutex. It is not in
+	// the hot path, i.e. Observe is called much more often than Write. The
+	// complication of making Write lock-free isn't worth it, if possible at
+	// all.
 	s.writeMtx.Lock()
 	defer s.writeMtx.Unlock()

-	// This is a bit arcane, which is why the following spells out this if
-	// clause in English:
-	//
-	// If the currently-hot counts struct is #0, we atomically increment
-	// s.countAndHotIdx by 1 so that from now on Observe will use the counts
-	// struct #1. Furthermore, the atomic increment gives us the new value,
-	// which, in its most significant 63 bits, tells us the count of
-	// observations done so far up to and including currently ongoing
-	// observations still using the counts struct just changed from hot to
-	// cold. To have a normal uint64 for the count, we bitshift by 1 and
-	// save the result in count. We also set s.hotIdx to 1 for the next
-	// Write call, and we will refer to counts #1 as hotCounts and to counts
-	// #0 as coldCounts.
-	//
-	// If the currently-hot counts struct is #1, we do the corresponding
-	// things the other way round. We have to _decrement_ s.countAndHotIdx
-	// (which is a bit arcane in itself, as we have to express -1 with an
-	// unsigned int...).
-	if s.hotIdx == 0 {
-		count = atomic.AddUint64(&s.countAndHotIdx, 1) >> 1
-		s.hotIdx = 1
-		hotCounts = s.counts[1]
-		coldCounts = s.counts[0]
-	} else {
-		count = atomic.AddUint64(&s.countAndHotIdx, ^uint64(0)) >> 1 // Decrement.
-		s.hotIdx = 0
-		hotCounts = s.counts[0]
-		coldCounts = s.counts[1]
-	}
+	// Adding 1<<63 switches the hot index (from 0 to 1 or from 1 to 0)
+	// without touching the count bits. See the struct comments for a full
+	// description of the algorithm.
+	n := atomic.AddUint64(&s.countAndHotIdx, 1<<63)
+	// count is contained unchanged in the lower 63 bits.
+	count := n & ((1 << 63) - 1)
+	// The most significant bit tells us which counts is hot. The complement
+	// is thus the cold one.
+	hotCounts := s.counts[n>>63]
+	coldCounts := s.counts[(^n)>>63]

-	// Now we have to wait for the now-declared-cold counts to actually cool
-	// down, i.e. wait for all observations still using it to finish. That's
-	// the case once the count in the cold counts struct is the same as the
-	// one atomically retrieved from the upper 63bits of s.countAndHotIdx.
-	for {
-		if count == atomic.LoadUint64(&coldCounts.count) {
-			break
-		}
+	// Await cooldown.
+	for count != atomic.LoadUint64(&coldCounts.count) {
 		runtime.Gosched() // Let observations get work done.
 	}

-	sum.SampleCount = proto.Uint64(count)
-	sum.SampleSum = proto.Float64(math.Float64frombits(atomic.LoadUint64(&coldCounts.sumBits)))
+	sum := &dto.Summary{
+		SampleCount: proto.Uint64(count),
+		SampleSum:   proto.Float64(math.Float64frombits(atomic.LoadUint64(&coldCounts.sumBits))),
+	}

 	out.Summary = sum
 	out.Label = s.labelPairs
--- a/vendor/github.com/prometheus/common/model/time.go
+++ b/vendor/github.com/prometheus/common/model/time.go
@ -150,7 +150,13 @@ func (t *Time) UnmarshalJSON(b []byte) error {
 			return err
 		}

-		*t = Time(v + va)
+		// If the value was something like -0.1 the negative is lost in the
+		// parsing because of the leading zero, this ensures that we capture it.
+		if len(p[0]) > 0 && p[0][0] == '-' && v+va > 0 {
+			*t = Time(v+va) * -1
+		} else {
+			*t = Time(v + va)
+		}

 	default:
 		return fmt.Errorf("invalid time %q", string(b))
--- a/vendor/github.com/prometheus/procfs/.golangci.yml
+++ b/vendor/github.com/prometheus/procfs/.golangci.yml
@ -0,0 +1,6 @@
+# Run only staticcheck for now. Additional linters will be enabled one-by-one.
+linters:
+  enable:
+  - staticcheck
+  - govet
+  disable-all: true
--- a/vendor/github.com/prometheus/procfs/MAINTAINERS.md
+++ b/vendor/github.com/prometheus/procfs/MAINTAINERS.md
@ -1,2 +1,2 @@
-* Tobias Schmidt <tobidt@gmail.com> @grobie
 * Johannes 'fish' Ziemke <github@freigeist.org> @discordianfish
+* Paul Gier <pgier@redhat.com> @pgier
--- a/vendor/github.com/prometheus/procfs/Makefile
+++ b/vendor/github.com/prometheus/procfs/Makefile
@ -14,17 +14,16 @@
 include Makefile.common

 %/.unpacked: %.ttar
+	@echo ">> extracting fixtures"
 	./ttar -C $(dir $*) -x -f $*.ttar
 	touch $@

-update_fixtures: fixtures.ttar sysfs/fixtures.ttar
-
-%fixtures.ttar: %/fixtures
-	rm -v $(dir $*)fixtures/.unpacked
-	./ttar -C $(dir $*) -c -f $*fixtures.ttar fixtures/
+update_fixtures:
+	rm -vf fixtures/.unpacked
+	./ttar -c -f fixtures.ttar fixtures/

 .PHONY: build
 build:

 .PHONY: test
-test: fixtures/.unpacked sysfs/fixtures/.unpacked common-test
+test: fixtures/.unpacked common-test
--- a/vendor/github.com/prometheus/procfs/Makefile.common
+++ b/vendor/github.com/prometheus/procfs/Makefile.common
@ -29,12 +29,15 @@ GO           ?= go
 GOFMT        ?= $(GO)fmt
 FIRST_GOPATH := $(firstword $(subst :, ,$(shell $(GO) env GOPATH)))
 GOOPTS       ?=
+GOHOSTOS     ?= $(shell $(GO) env GOHOSTOS)
+GOHOSTARCH   ?= $(shell $(GO) env GOHOSTARCH)

 GO_VERSION        ?= $(shell $(GO) version)
 GO_VERSION_NUMBER ?= $(word 3, $(GO_VERSION))
 PRE_GO_111        ?= $(shell echo $(GO_VERSION_NUMBER) | grep -E 'go1\.(10|[0-9])\.')

-unexport GOVENDOR
+GOVENDOR :=
+GO111MODULE :=
 ifeq (, $(PRE_GO_111))
 	ifneq (,$(wildcard go.mod))
 		# Enforce Go modules support just in case the directory is inside GOPATH (and for Travis CI).
@ -55,32 +58,57 @@ $(warning Some recipes may not work as expected as the current Go runtime is '$(
 		# This repository isn't using Go modules (yet).
 		GOVENDOR := $(FIRST_GOPATH)/bin/govendor
 	endif
-
-	unexport GO111MODULE
 endif
 PROMU        := $(FIRST_GOPATH)/bin/promu
-STATICCHECK  := $(FIRST_GOPATH)/bin/staticcheck
 pkgs          = ./...

-GO_VERSION        ?= $(shell $(GO) version)
-GO_BUILD_PLATFORM ?= $(subst /,-,$(lastword $(GO_VERSION)))
+ifeq (arm, $(GOHOSTARCH))
+	GOHOSTARM ?= $(shell GOARM= $(GO) env GOARM)
+	GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)v$(GOHOSTARM)
+else
+	GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)
+endif

-PROMU_VERSION ?= 0.2.0
+PROMU_VERSION ?= 0.4.0
 PROMU_URL     := https://github.com/prometheus/promu/releases/download/v$(PROMU_VERSION)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM).tar.gz

+GOLANGCI_LINT :=
+GOLANGCI_LINT_OPTS ?=
+GOLANGCI_LINT_VERSION ?= v1.16.0
+# golangci-lint only supports linux, darwin and windows platforms on i386/amd64.
+# windows isn't included here because of the path separator being different.
+ifeq ($(GOHOSTOS),$(filter $(GOHOSTOS),linux darwin))
+	ifeq ($(GOHOSTARCH),$(filter $(GOHOSTARCH),amd64 i386))
+		GOLANGCI_LINT := $(FIRST_GOPATH)/bin/golangci-lint
+	endif
+endif
+
 PREFIX                  ?= $(shell pwd)
 BIN_DIR                 ?= $(shell pwd)
 DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
 DOCKER_REPO             ?= prom

-.PHONY: all
-all: precheck style staticcheck unused build test
+DOCKER_ARCHS            ?= amd64
+
+BUILD_DOCKER_ARCHS = $(addprefix common-docker-,$(DOCKER_ARCHS))
+PUBLISH_DOCKER_ARCHS = $(addprefix common-docker-publish-,$(DOCKER_ARCHS))
+TAG_DOCKER_ARCHS = $(addprefix common-docker-tag-latest-,$(DOCKER_ARCHS))
+
+ifeq ($(GOHOSTARCH),amd64)
+        ifeq ($(GOHOSTOS),$(filter $(GOHOSTOS),linux freebsd darwin windows))
+                # Only supported on amd64
+                test-flags := -race
+        endif
+endif

 # This rule is used to forward a target like "build" to "common-build".  This
 # allows a new "build" target to be defined in a Makefile which includes this
 # one and override "common-build" without override warnings.
 %: common-% ;

+.PHONY: common-all
+common-all: precheck style check_license lint unused build test
+
 .PHONY: common-style
 common-style:
 	@echo ">> checking code style"
@ -102,6 +130,15 @@ common-check_license:
               exit 1; \
       fi

+.PHONY: common-deps
+common-deps:
+	@echo ">> getting dependencies"
+ifdef GO111MODULE
+	GO111MODULE=$(GO111MODULE) $(GO) mod download
+else
+	$(GO) get $(GOOPTS) -t ./...
+endif
+
 .PHONY: common-test-short
 common-test-short:
 	@echo ">> running short tests"
@ -110,26 +147,35 @@ common-test-short:
 .PHONY: common-test
 common-test:
 	@echo ">> running all tests"
-	GO111MODULE=$(GO111MODULE) $(GO) test -race $(GOOPTS) $(pkgs)
+	GO111MODULE=$(GO111MODULE) $(GO) test $(test-flags) $(GOOPTS) $(pkgs)

 .PHONY: common-format
 common-format:
 	@echo ">> formatting code"
-	GO111MODULE=$(GO111MODULE) $(GO) fmt $(GOOPTS) $(pkgs)
+	GO111MODULE=$(GO111MODULE) $(GO) fmt $(pkgs)

 .PHONY: common-vet
 common-vet:
 	@echo ">> vetting code"
 	GO111MODULE=$(GO111MODULE) $(GO) vet $(GOOPTS) $(pkgs)

-.PHONY: common-staticcheck
-common-staticcheck: $(STATICCHECK)
-	@echo ">> running staticcheck"
+.PHONY: common-lint
+common-lint: $(GOLANGCI_LINT)
+ifdef GOLANGCI_LINT
+	@echo ">> running golangci-lint"
 ifdef GO111MODULE
-	GO111MODULE=$(GO111MODULE) $(STATICCHECK) -ignore "$(STATICCHECK_IGNORE)" -checks "SA*" $(pkgs)
+# 'go list' needs to be executed before staticcheck to prepopulate the modules cache.
+# Otherwise staticcheck might fail randomly for some reason not yet explained.
+	GO111MODULE=$(GO111MODULE) $(GO) list -e -compiled -test=true -export=false -deps=true -find=false -tags= -- ./... > /dev/null
+	GO111MODULE=$(GO111MODULE) $(GOLANGCI_LINT) run $(GOLANGCI_LINT_OPTS) $(pkgs)
 else
-	$(STATICCHECK) -ignore "$(STATICCHECK_IGNORE)" $(pkgs)
+	$(GOLANGCI_LINT) run $(pkgs)
 endif
+endif
+
+# For backward-compatibility.
+.PHONY: common-staticcheck
+common-staticcheck: lint

 .PHONY: common-unused
 common-unused: $(GOVENDOR)
@ -140,8 +186,9 @@ else
 ifdef GO111MODULE
 	@echo ">> running check for unused/missing packages in go.mod"
 	GO111MODULE=$(GO111MODULE) $(GO) mod tidy
+ifeq (,$(wildcard vendor))
 	@git diff --exit-code -- go.sum go.mod
-ifneq (,$(wildcard vendor))
+else
 	@echo ">> running check for unused packages in vendor/"
 	GO111MODULE=$(GO111MODULE) $(GO) mod vendor
 	@git diff --exit-code -- go.sum go.mod vendor/
@ -159,45 +206,48 @@ common-tarball: promu
 	@echo ">> building release tarball"
 	$(PROMU) tarball --prefix $(PREFIX) $(BIN_DIR)

-.PHONY: common-docker
-common-docker:
-	docker build -t "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" .
+.PHONY: common-docker $(BUILD_DOCKER_ARCHS)
+common-docker: $(BUILD_DOCKER_ARCHS)
+$(BUILD_DOCKER_ARCHS): common-docker-%:
+	docker build -t "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:$(DOCKER_IMAGE_TAG)" \
+		--build-arg ARCH="$*" \
+		--build-arg OS="linux" \
+		.

-.PHONY: common-docker-publish
-common-docker-publish:
-	docker push "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)"
+.PHONY: common-docker-publish $(PUBLISH_DOCKER_ARCHS)
+common-docker-publish: $(PUBLISH_DOCKER_ARCHS)
+$(PUBLISH_DOCKER_ARCHS): common-docker-publish-%:
+	docker push "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:$(DOCKER_IMAGE_TAG)"

-.PHONY: common-docker-tag-latest
-common-docker-tag-latest:
-	docker tag "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):latest"
+.PHONY: common-docker-tag-latest $(TAG_DOCKER_ARCHS)
+common-docker-tag-latest: $(TAG_DOCKER_ARCHS)
+$(TAG_DOCKER_ARCHS): common-docker-tag-latest-%:
+	docker tag "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:$(DOCKER_IMAGE_TAG)" "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:latest"
+
+.PHONY: common-docker-manifest
+common-docker-manifest:
+	DOCKER_CLI_EXPERIMENTAL=enabled docker manifest create -a "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" $(foreach ARCH,$(DOCKER_ARCHS),$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$(ARCH):$(DOCKER_IMAGE_TAG))
+	DOCKER_CLI_EXPERIMENTAL=enabled docker manifest push "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)"

 .PHONY: promu
 promu: $(PROMU)

 $(PROMU):
-	curl -s -L $(PROMU_URL) | tar -xvz -C /tmp
-	mkdir -v -p $(FIRST_GOPATH)/bin
-	cp -v /tmp/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM)/promu $(PROMU)
+	$(eval PROMU_TMP := $(shell mktemp -d))
+	curl -s -L $(PROMU_URL) | tar -xvzf - -C $(PROMU_TMP)
+	mkdir -p $(FIRST_GOPATH)/bin
+	cp $(PROMU_TMP)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM)/promu $(FIRST_GOPATH)/bin/promu
+	rm -r $(PROMU_TMP)

 .PHONY: proto
 proto:
 	@echo ">> generating code from proto files"
 	@./scripts/genproto.sh

-.PHONY: $(STATICCHECK)
-$(STATICCHECK):
-ifdef GO111MODULE
-# Get staticcheck from a temporary directory to avoid modifying the local go.{mod,sum}.
-# See https://github.com/golang/go/issues/27643.
-# For now, we are using the next branch of staticcheck because master isn't compatible yet with Go modules.
-	tmpModule=$$(mktemp -d 2>&1) && \
-	mkdir -p $${tmpModule}/staticcheck && \
-	cd "$${tmpModule}"/staticcheck && \
-	GO111MODULE=on $(GO) mod init example.com/staticcheck && \
-	GO111MODULE=on GOOS= GOARCH= $(GO) get -u honnef.co/go/tools/cmd/staticcheck@next && \
-	rm -rf $${tmpModule};
-else
-	GOOS= GOARCH= GO111MODULE=off $(GO) get -u honnef.co/go/tools/cmd/staticcheck
+ifdef GOLANGCI_LINT
+$(GOLANGCI_LINT):
+	mkdir -p $(FIRST_GOPATH)/bin
+	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(FIRST_GOPATH)/bin $(GOLANGCI_LINT_VERSION)
 endif

 ifdef GOVENDOR
@ -212,7 +262,6 @@ precheck::
 define PRECHECK_COMMAND_template =
 precheck:: $(1)_precheck

-
 PRECHECK_COMMAND_$(1) ?= $(1) $$(strip $$(PRECHECK_OPTIONS_$(1)))
 .PHONY: $(1)_precheck
 $(1)_precheck:
--- a/vendor/github.com/prometheus/procfs/README.md
+++ b/vendor/github.com/prometheus/procfs/README.md
@ -1,7 +1,7 @@
 # procfs

 This procfs package provides functions to retrieve system, kernel and process
-metrics from the pseudo-filesystem proc.
+metrics from the pseudo-filesystems /proc and /sys.

 *WARNING*: This package is a work in progress. Its API may still break in
 backwards-incompatible ways without warnings. Use it at your own risk.
@ -9,3 +9,45 @@ backwards-incompatible ways without warnings. Use it at your own risk.
 [![GoDoc](https://godoc.org/github.com/prometheus/procfs?status.png)](https://godoc.org/github.com/prometheus/procfs)
 [![Build Status](https://travis-ci.org/prometheus/procfs.svg?branch=master)](https://travis-ci.org/prometheus/procfs)
 [![Go Report Card](https://goreportcard.com/badge/github.com/prometheus/procfs)](https://goreportcard.com/report/github.com/prometheus/procfs)
+
+## Usage
+
+The procfs library is organized by packages based on whether the gathered data is coming from
+/proc, /sys, or both.  Each package contains an `FS` type which represents the path to either /proc, /sys, or both.  For example, current cpu statistics are gathered from
+`/proc/stat` and are available via the root procfs package.  First, the proc filesystem mount
+point is initialized, and then the stat information is read.
+
+```go
+fs, err := procfs.NewFS("/proc")
+stats, err := fs.Stat()
+```
+
+Some sub-packages such as `blockdevice`, require access to both the proc and sys filesystems.
+
+```go
+    fs, err := blockdevice.NewFS("/proc", "/sys")
+    stats, err := fs.ProcDiskstats()
+```
+
+## Building and Testing
+
+The procfs library is normally built as part of another application.  However, when making
+changes to the library, the `make test` command can be used to run the API test suite.
+
+### Updating Test Fixtures
+
+The procfs library includes a set of test fixtures which include many example files from
+the `/proc` and `/sys` filesystems.  These fixtures are included as a [ttar](https://github.com/ideaship/ttar) file
+which is extracted automatically during testing.  To add/update the test fixtures, first
+ensure the `fixtures` directory is up to date by removing the existing directory and then
+extracting the ttar file using `make fixtures/.unpacked` or just `make test`.
+
+```bash
+rm -rf fixtures
+make test
+```
+
+Next, make the required changes to the extracted files in the `fixtures` directory.  When
+the changes are complete, run `make update_fixtures` to create a new `fixtures.ttar` file
+based on the updated `fixtures` directory.  And finally, verify the changes using
+`git diff fixtures.ttar`.
--- a/vendor/github.com/prometheus/procfs/buddyinfo.go
+++ b/vendor/github.com/prometheus/procfs/buddyinfo.go
@ -31,19 +31,9 @@ type BuddyInfo struct {
 	Sizes []float64
 }

-// NewBuddyInfo reads the buddyinfo statistics.
-func NewBuddyInfo() ([]BuddyInfo, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return nil, err
-	}
-
-	return fs.NewBuddyInfo()
-}
-
 // NewBuddyInfo reads the buddyinfo statistics from the specified `proc` filesystem.
-func (fs FS) NewBuddyInfo() ([]BuddyInfo, error) {
-	file, err := os.Open(fs.Path("buddyinfo"))
+func (fs FS) BuddyInfo() ([]BuddyInfo, error) {
+	file, err := os.Open(fs.proc.Path("buddyinfo"))
 	if err != nil {
 		return nil, err
 	}
--- a/vendor/github.com/prometheus/procfs/fixtures.ttar
+++ b/vendor/github.com/prometheus/procfs/fixtures.ttar
--- a/vendor/github.com/prometheus/procfs/fs.go
+++ b/vendor/github.com/prometheus/procfs/fs.go
@ -14,69 +14,30 @@
 package procfs

 import (
-	"fmt"
-	"os"
-	"path"
-
-	"github.com/prometheus/procfs/nfs"
-	"github.com/prometheus/procfs/xfs"
+	"github.com/prometheus/procfs/internal/fs"
 )

-// FS represents the pseudo-filesystem proc, which provides an interface to
+// FS represents the pseudo-filesystem sys, which provides an interface to
 // kernel data structures.
-type FS string
+type FS struct {
+	proc fs.FS
+}

 // DefaultMountPoint is the common mount point of the proc filesystem.
-const DefaultMountPoint = "/proc"
+const DefaultMountPoint = fs.DefaultProcMountPoint

-// NewFS returns a new FS mounted under the given mountPoint. It will error
-// if the mount point can't be read.
+// NewDefaultFS returns a new proc FS mounted under the default proc mountPoint.
+// It will error if the mount point directory can't be read or is a file.
+func NewDefaultFS() (FS, error) {
+	return NewFS(DefaultMountPoint)
+}
+
+// NewFS returns a new proc FS mounted under the given proc mountPoint. It will error
+// if the mount point directory can't be read or is a file.
 func NewFS(mountPoint string) (FS, error) {
-	info, err := os.Stat(mountPoint)
+	fs, err := fs.NewFS(mountPoint)
 	if err != nil {
-		return "", fmt.Errorf("could not read %s: %s", mountPoint, err)
+		return FS{}, err
 	}
-	if !info.IsDir() {
-		return "", fmt.Errorf("mount point %s is not a directory", mountPoint)
-	}
-
-	return FS(mountPoint), nil
-}
-
-// Path returns the path of the given subsystem relative to the procfs root.
-func (fs FS) Path(p ...string) string {
-	return path.Join(append([]string{string(fs)}, p...)...)
-}
-
-// XFSStats retrieves XFS filesystem runtime statistics.
-func (fs FS) XFSStats() (*xfs.Stats, error) {
-	f, err := os.Open(fs.Path("fs/xfs/stat"))
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	return xfs.ParseStats(f)
-}
-
-// NFSClientRPCStats retrieves NFS client RPC statistics.
-func (fs FS) NFSClientRPCStats() (*nfs.ClientRPCStats, error) {
-	f, err := os.Open(fs.Path("net/rpc/nfs"))
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	return nfs.ParseClientRPCStats(f)
-}
-
-// NFSdServerRPCStats retrieves NFS daemon RPC statistics.
-func (fs FS) NFSdServerRPCStats() (*nfs.ServerRPCStats, error) {
-	f, err := os.Open(fs.Path("net/rpc/nfsd"))
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	return nfs.ParseServerRPCStats(f)
+	return FS{fs}, nil
 }
--- a/vendor/github.com/prometheus/procfs/go.mod
+++ b/vendor/github.com/prometheus/procfs/go.mod
@ -1 +1,3 @@
 module github.com/prometheus/procfs
+
+require golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4
--- a/vendor/github.com/prometheus/procfs/go.sum
+++ b/vendor/github.com/prometheus/procfs/go.sum
@ -0,0 +1,2 @@
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 h1:YUO/7uOKsKeq9UokNS62b8FYywz3ker1l1vDZRCRefw=
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
--- a/vendor/github.com/prometheus/procfs/internal/fs/fs.go
+++ b/vendor/github.com/prometheus/procfs/internal/fs/fs.go
@ -0,0 +1,52 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fs
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+const (
+	// DefaultProcMountPoint is the common mount point of the proc filesystem.
+	DefaultProcMountPoint = "/proc"
+
+	// DefaultSysMountPoint is the common mount point of the sys filesystem.
+	DefaultSysMountPoint = "/sys"
+)
+
+// FS represents a pseudo-filesystem, normally /proc or /sys, which provides an
+// interface to kernel data structures.
+type FS string
+
+// NewFS returns a new FS mounted under the given mountPoint. It will error
+// if the mount point can't be read.
+func NewFS(mountPoint string) (FS, error) {
+	info, err := os.Stat(mountPoint)
+	if err != nil {
+		return "", fmt.Errorf("could not read %s: %s", mountPoint, err)
+	}
+	if !info.IsDir() {
+		return "", fmt.Errorf("mount point %s is not a directory", mountPoint)
+	}
+
+	return FS(mountPoint), nil
+}
+
+// Path appends the given path elements to the filesystem path, adding separators
+// as necessary.
+func (fs FS) Path(p ...string) string {
+	return filepath.Join(append([]string{string(fs)}, p...)...)
+}
--- a/vendor/github.com/prometheus/procfs/internal/util/parse.go
+++ b/vendor/github.com/prometheus/procfs/internal/util/parse.go
@ -1,59 +0,0 @@
-// Copyright 2018 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package util
-
-import (
-	"io/ioutil"
-	"strconv"
-	"strings"
-)
-
-// ParseUint32s parses a slice of strings into a slice of uint32s.
-func ParseUint32s(ss []string) ([]uint32, error) {
-	us := make([]uint32, 0, len(ss))
-	for _, s := range ss {
-		u, err := strconv.ParseUint(s, 10, 32)
-		if err != nil {
-			return nil, err
-		}
-
-		us = append(us, uint32(u))
-	}
-
-	return us, nil
-}
-
-// ParseUint64s parses a slice of strings into a slice of uint64s.
-func ParseUint64s(ss []string) ([]uint64, error) {
-	us := make([]uint64, 0, len(ss))
-	for _, s := range ss {
-		u, err := strconv.ParseUint(s, 10, 64)
-		if err != nil {
-			return nil, err
-		}
-
-		us = append(us, u)
-	}
-
-	return us, nil
-}
-
-// ReadUintFromFile reads a file and attempts to parse a uint64 from it.
-func ReadUintFromFile(path string) (uint64, error) {
-	data, err := ioutil.ReadFile(path)
-	if err != nil {
-		return 0, err
-	}
-	return strconv.ParseUint(strings.TrimSpace(string(data)), 10, 64)
-}
--- a/vendor/github.com/prometheus/procfs/internal/util/sysreadfile_linux.go
+++ b/vendor/github.com/prometheus/procfs/internal/util/sysreadfile_linux.go
@ -1,45 +0,0 @@
-// Copyright 2018 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build !windows
-
-package util
-
-import (
-	"bytes"
-	"os"
-	"syscall"
-)
-
-// SysReadFile is a simplified ioutil.ReadFile that invokes syscall.Read directly.
-// https://github.com/prometheus/node_exporter/pull/728/files
-func SysReadFile(file string) (string, error) {
-	f, err := os.Open(file)
-	if err != nil {
-		return "", err
-	}
-	defer f.Close()
-
-	// On some machines, hwmon drivers are broken and return EAGAIN.  This causes
-	// Go's ioutil.ReadFile implementation to poll forever.
-	//
-	// Since we either want to read data or bail immediately, do the simplest
-	// possible read using syscall directly.
-	b := make([]byte, 128)
-	n, err := syscall.Read(int(f.Fd()), b)
-	if err != nil {
-		return "", err
-	}
-
-	return string(bytes.TrimSpace(b[:n])), nil
-}
--- a/vendor/github.com/prometheus/procfs/ipvs.go
+++ b/vendor/github.com/prometheus/procfs/ipvs.go
@ -62,19 +62,9 @@ type IPVSBackendStatus struct {
 	Weight uint64
 }

-// NewIPVSStats reads the IPVS statistics.
-func NewIPVSStats() (IPVSStats, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return IPVSStats{}, err
-	}
-
-	return fs.NewIPVSStats()
-}
-
-// NewIPVSStats reads the IPVS statistics from the specified `proc` filesystem.
-func (fs FS) NewIPVSStats() (IPVSStats, error) {
-	file, err := os.Open(fs.Path("net/ip_vs_stats"))
+// IPVSStats reads the IPVS statistics from the specified `proc` filesystem.
+func (fs FS) IPVSStats() (IPVSStats, error) {
+	file, err := os.Open(fs.proc.Path("net/ip_vs_stats"))
 	if err != nil {
 		return IPVSStats{}, err
 	}
@ -131,19 +121,9 @@ func parseIPVSStats(file io.Reader) (IPVSStats, error) {
 	return stats, nil
 }

-// NewIPVSBackendStatus reads and returns the status of all (virtual,real) server pairs.
-func NewIPVSBackendStatus() ([]IPVSBackendStatus, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return []IPVSBackendStatus{}, err
-	}
-
-	return fs.NewIPVSBackendStatus()
-}
-
-// NewIPVSBackendStatus reads and returns the status of all (virtual,real) server pairs from the specified `proc` filesystem.
-func (fs FS) NewIPVSBackendStatus() ([]IPVSBackendStatus, error) {
-	file, err := os.Open(fs.Path("net/ip_vs"))
+// IPVSBackendStatus reads and returns the status of all (virtual,real) server pairs from the specified `proc` filesystem.
+func (fs FS) IPVSBackendStatus() ([]IPVSBackendStatus, error) {
+	file, err := os.Open(fs.proc.Path("net/ip_vs"))
 	if err != nil {
 		return nil, err
 	}
--- a/vendor/github.com/prometheus/procfs/mdstat.go
+++ b/vendor/github.com/prometheus/procfs/mdstat.go
@ -42,64 +42,64 @@ type MDStat struct {
 	BlocksSynced int64
 }

-// ParseMDStat parses an mdstat-file and returns a struct with the relevant infos.
-func (fs FS) ParseMDStat() (mdstates []MDStat, err error) {
-	mdStatusFilePath := fs.Path("mdstat")
-	content, err := ioutil.ReadFile(mdStatusFilePath)
+// MDStat parses an mdstat-file (/proc/mdstat) and returns a slice of
+// structs containing the relevant info.  More information available here:
+// https://raid.wiki.kernel.org/index.php/Mdstat
+func (fs FS) MDStat() ([]MDStat, error) {
+	data, err := ioutil.ReadFile(fs.proc.Path("mdstat"))
 	if err != nil {
-		return []MDStat{}, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
+		return nil, fmt.Errorf("error parsing mdstat %s: %s", fs.proc.Path("mdstat"), err)
 	}
+	mdstat, err := parseMDStat(data)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing mdstat %s: %s", fs.proc.Path("mdstat"), err)
+	}
+	return mdstat, nil
+}

-	mdStates := []MDStat{}
-	lines := strings.Split(string(content), "\n")
+// parseMDStat parses data from mdstat file (/proc/mdstat) and returns a slice of
+// structs containing the relevant info.
+func parseMDStat(mdstatData []byte) ([]MDStat, error) {
+	mdStats := []MDStat{}
+	lines := strings.Split(string(mdstatData), "\n")
 	for i, l := range lines {
-		if l == "" {
-			continue
-		}
-		if l[0] == ' ' {
-			continue
-		}
-		if strings.HasPrefix(l, "Personalities") || strings.HasPrefix(l, "unused") {
+		if strings.TrimSpace(l) == "" || l[0] == ' ' ||
+			strings.HasPrefix(l, "Personalities") || strings.HasPrefix(l, "unused") {
 			continue
 		}

-		mainLine := strings.Split(l, " ")
-		if len(mainLine) < 3 {
-			return mdStates, fmt.Errorf("error parsing mdline: %s", l)
+		deviceFields := strings.Fields(l)
+		if len(deviceFields) < 3 {
+			return nil, fmt.Errorf("not enough fields in mdline (expected at least 3): %s", l)
 		}
-		mdName := mainLine[0]
-		activityState := mainLine[2]
+		mdName := deviceFields[0]
+		activityState := deviceFields[2]

 		if len(lines) <= i+3 {
-			return mdStates, fmt.Errorf(
-				"error parsing %s: too few lines for md device %s",
-				mdStatusFilePath,
-				mdName,
-			)
+			return mdStats, fmt.Errorf("missing lines for md device %s", mdName)
 		}

-		active, total, size, err := evalStatusline(lines[i+1])
+		active, total, size, err := evalStatusLine(lines[i+1])
 		if err != nil {
-			return mdStates, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
+			return nil, err
 		}

-		// j is the line number of the syncing-line.
-		j := i + 2
+		syncLineIdx := i + 2
 		if strings.Contains(lines[i+2], "bitmap") { // skip bitmap line
-			j = i + 3
+			syncLineIdx++
 		}

-		// If device is syncing at the moment, get the number of currently
+		// If device is recovering/syncing at the moment, get the number of currently
 		// synced bytes, otherwise that number equals the size of the device.
 		syncedBlocks := size
-		if strings.Contains(lines[j], "recovery") || strings.Contains(lines[j], "resync") {
-			syncedBlocks, err = evalBuildline(lines[j])
+		if strings.Contains(lines[syncLineIdx], "recovery") || strings.Contains(lines[syncLineIdx], "resync") {
+			syncedBlocks, err = evalRecoveryLine(lines[syncLineIdx])
 			if err != nil {
-				return mdStates, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
+				return nil, err
 			}
 		}

-		mdStates = append(mdStates, MDStat{
+		mdStats = append(mdStats, MDStat{
 			Name:          mdName,
 			ActivityState: activityState,
 			DisksActive:   active,
@ -109,10 +109,10 @@ func (fs FS) ParseMDStat() (mdstates []MDStat, err error) {
 		})
 	}

-	return mdStates, nil
+	return mdStats, nil
 }

-func evalStatusline(statusline string) (active, total, size int64, err error) {
+func evalStatusLine(statusline string) (active, total, size int64, err error) {
 	matches := statuslineRE.FindStringSubmatch(statusline)
 	if len(matches) != 4 {
 		return 0, 0, 0, fmt.Errorf("unexpected statusline: %s", statusline)
@ -136,7 +136,7 @@ func evalStatusline(statusline string) (active, total, size int64, err error) {
 	return active, total, size, nil
 }

-func evalBuildline(buildline string) (syncedBlocks int64, err error) {
+func evalRecoveryLine(buildline string) (syncedBlocks int64, err error) {
 	matches := buildlineRE.FindStringSubmatch(buildline)
 	if len(matches) != 2 {
 		return 0, fmt.Errorf("unexpected buildline: %s", buildline)
--- a/vendor/github.com/prometheus/procfs/mountstats.go
+++ b/vendor/github.com/prometheus/procfs/mountstats.go
@ -69,6 +69,8 @@ type MountStats interface {
 type MountStatsNFS struct {
 	// The version of statistics provided.
 	StatVersion string
+	// The mount options of the NFS mount.
+	Opts map[string]string
 	// The age of the NFS mount.
 	Age time.Duration
 	// Statistics related to byte counters for various operations.
@ -179,11 +181,11 @@ type NFSOperationStats struct {
 	// Number of bytes received for this operation, including RPC headers and payload.
 	BytesReceived uint64
 	// Duration all requests spent queued for transmission before they were sent.
-	CumulativeQueueTime time.Duration
+	CumulativeQueueMilliseconds uint64
 	// Duration it took to get a reply back after the request was transmitted.
-	CumulativeTotalResponseTime time.Duration
+	CumulativeTotalResponseMilliseconds uint64
 	// Duration from when a request was enqueued to when it was completely handled.
-	CumulativeTotalRequestTime time.Duration
+	CumulativeTotalRequestMilliseconds uint64
 }

 // A NFSTransportStats contains statistics for the NFS mount RPC requests and
@ -202,7 +204,7 @@ type NFSTransportStats struct {
 	// spent waiting for connections to the server to be established.
 	ConnectIdleTime uint64
 	// Duration since the NFS mount last saw any RPC traffic.
-	IdleTime time.Duration
+	IdleTimeSeconds uint64
 	// Number of RPC requests for this mount sent to the NFS server.
 	Sends uint64
 	// Number of RPC responses for this mount received from the NFS server.
@ -317,6 +319,7 @@ func parseMount(ss []string) (*Mount, error) {
 func parseMountStatsNFS(s *bufio.Scanner, statVersion string) (*MountStatsNFS, error) {
 	// Field indicators for parsing specific types of data
 	const (
+		fieldOpts       = "opts:"
 		fieldAge        = "age:"
 		fieldBytes      = "bytes:"
 		fieldEvents     = "events:"
@ -338,6 +341,18 @@ func parseMountStatsNFS(s *bufio.Scanner, statVersion string) (*MountStatsNFS, e
 		}

 		switch ss[0] {
+		case fieldOpts:
+			if stats.Opts == nil {
+				stats.Opts = map[string]string{}
+			}
+			for _, opt := range strings.Split(ss[1], ",") {
+				split := strings.Split(opt, "=")
+				if len(split) == 2 {
+					stats.Opts[split[0]] = split[1]
+				} else {
+					stats.Opts[opt] = ""
+				}
+			}
 		case fieldAge:
 			// Age integer is in seconds
 			d, err := time.ParseDuration(ss[1] + "s")
@ -509,15 +524,15 @@ func parseNFSOperationStats(s *bufio.Scanner) ([]NFSOperationStats, error) {
 		}

 		ops = append(ops, NFSOperationStats{
-			Operation:                   strings.TrimSuffix(ss[0], ":"),
-			Requests:                    ns[0],
-			Transmissions:               ns[1],
-			MajorTimeouts:               ns[2],
-			BytesSent:                   ns[3],
-			BytesReceived:               ns[4],
-			CumulativeQueueTime:         time.Duration(ns[5]) * time.Millisecond,
-			CumulativeTotalResponseTime: time.Duration(ns[6]) * time.Millisecond,
-			CumulativeTotalRequestTime:  time.Duration(ns[7]) * time.Millisecond,
+			Operation:                           strings.TrimSuffix(ss[0], ":"),
+			Requests:                            ns[0],
+			Transmissions:                       ns[1],
+			MajorTimeouts:                       ns[2],
+			BytesSent:                           ns[3],
+			BytesReceived:                       ns[4],
+			CumulativeQueueMilliseconds:         ns[5],
+			CumulativeTotalResponseMilliseconds: ns[6],
+			CumulativeTotalRequestMilliseconds:  ns[7],
 		})
 	}

@ -593,7 +608,7 @@ func parseNFSTransportStats(ss []string, statVersion string) (*NFSTransportStats
 		Bind:                     ns[1],
 		Connect:                  ns[2],
 		ConnectIdleTime:          ns[3],
-		IdleTime:                 time.Duration(ns[4]) * time.Second,
+		IdleTimeSeconds:          ns[4],
 		Sends:                    ns[5],
 		Receives:                 ns[6],
 		BadTransactionIDs:        ns[7],
--- a/vendor/github.com/prometheus/procfs/net_dev.go
+++ b/vendor/github.com/prometheus/procfs/net_dev.go
@ -47,23 +47,13 @@ type NetDevLine struct {
 // are interface names.
 type NetDev map[string]NetDevLine

-// NewNetDev returns kernel/system statistics read from /proc/net/dev.
-func NewNetDev() (NetDev, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return nil, err
-	}
-
-	return fs.NewNetDev()
+// NetDev returns kernel/system statistics read from /proc/net/dev.
+func (fs FS) NetDev() (NetDev, error) {
+	return newNetDev(fs.proc.Path("net/dev"))
 }

-// NewNetDev returns kernel/system statistics read from /proc/net/dev.
-func (fs FS) NewNetDev() (NetDev, error) {
-	return newNetDev(fs.Path("net/dev"))
-}
-
-// NewNetDev returns kernel/system statistics read from /proc/[pid]/net/dev.
-func (p Proc) NewNetDev() (NetDev, error) {
+// NetDev returns kernel/system statistics read from /proc/[pid]/net/dev.
+func (p Proc) NetDev() (NetDev, error) {
 	return newNetDev(p.path("net/dev"))
 }

@ -75,7 +65,7 @@ func newNetDev(file string) (NetDev, error) {
 	}
 	defer f.Close()

-	nd := NetDev{}
+	netDev := NetDev{}
 	s := bufio.NewScanner(f)
 	for n := 0; s.Scan(); n++ {
 		// Skip the 2 header lines.
@ -83,20 +73,20 @@ func newNetDev(file string) (NetDev, error) {
 			continue
 		}

-		line, err := nd.parseLine(s.Text())
+		line, err := netDev.parseLine(s.Text())
 		if err != nil {
-			return nd, err
+			return netDev, err
 		}

-		nd[line.Name] = *line
+		netDev[line.Name] = *line
 	}

-	return nd, s.Err()
+	return netDev, s.Err()
 }

 // parseLine parses a single line from the /proc/net/dev file. Header lines
 // must be filtered prior to calling this method.
-func (nd NetDev) parseLine(rawLine string) (*NetDevLine, error) {
+func (netDev NetDev) parseLine(rawLine string) (*NetDevLine, error) {
 	parts := strings.SplitN(rawLine, ":", 2)
 	if len(parts) != 2 {
 		return nil, errors.New("invalid net/dev line, missing colon")
@ -185,11 +175,11 @@ func (nd NetDev) parseLine(rawLine string) (*NetDevLine, error) {

 // Total aggregates the values across interfaces and returns a new NetDevLine.
 // The Name field will be a sorted comma separated list of interface names.
-func (nd NetDev) Total() NetDevLine {
+func (netDev NetDev) Total() NetDevLine {
 	total := NetDevLine{}

-	names := make([]string, 0, len(nd))
-	for _, ifc := range nd {
+	names := make([]string, 0, len(netDev))
+	for _, ifc := range netDev {
 		names = append(names, ifc.Name)
 		total.RxBytes += ifc.RxBytes
 		total.RxPackets += ifc.RxPackets
--- a/vendor/github.com/prometheus/procfs/net_unix.go
+++ b/vendor/github.com/prometheus/procfs/net_unix.go
@ -0,0 +1,275 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package procfs
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// For the proc file format details,
+// see https://elixir.bootlin.com/linux/v4.17/source/net/unix/af_unix.c#L2815
+// and https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/net.h#L48.
+
+const (
+	netUnixKernelPtrIdx = iota
+	netUnixRefCountIdx
+	_
+	netUnixFlagsIdx
+	netUnixTypeIdx
+	netUnixStateIdx
+	netUnixInodeIdx
+
+	// Inode and Path are optional.
+	netUnixStaticFieldsCnt = 6
+)
+
+const (
+	netUnixTypeStream    = 1
+	netUnixTypeDgram     = 2
+	netUnixTypeSeqpacket = 5
+
+	netUnixFlagListen = 1 << 16
+
+	netUnixStateUnconnected  = 1
+	netUnixStateConnecting   = 2
+	netUnixStateConnected    = 3
+	netUnixStateDisconnected = 4
+)
+
+var errInvalidKernelPtrFmt = errors.New("Invalid Num(the kernel table slot number) format")
+
+// NetUnixType is the type of the type field.
+type NetUnixType uint64
+
+// NetUnixFlags is the type of the flags field.
+type NetUnixFlags uint64
+
+// NetUnixState is the type of the state field.
+type NetUnixState uint64
+
+// NetUnixLine represents a line of /proc/net/unix.
+type NetUnixLine struct {
+	KernelPtr string
+	RefCount  uint64
+	Protocol  uint64
+	Flags     NetUnixFlags
+	Type      NetUnixType
+	State     NetUnixState
+	Inode     uint64
+	Path      string
+}
+
+// NetUnix holds the data read from /proc/net/unix.
+type NetUnix struct {
+	Rows []*NetUnixLine
+}
+
+// NewNetUnix returns data read from /proc/net/unix.
+func NewNetUnix() (*NetUnix, error) {
+	fs, err := NewFS(DefaultMountPoint)
+	if err != nil {
+		return nil, err
+	}
+
+	return fs.NewNetUnix()
+}
+
+// NewNetUnix returns data read from /proc/net/unix.
+func (fs FS) NewNetUnix() (*NetUnix, error) {
+	return NewNetUnixByPath(fs.proc.Path("net/unix"))
+}
+
+// NewNetUnixByPath returns data read from /proc/net/unix by file path.
+// It might returns an error with partial parsed data, if an error occur after some data parsed.
+func NewNetUnixByPath(path string) (*NetUnix, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	return NewNetUnixByReader(f)
+}
+
+// NewNetUnixByReader returns data read from /proc/net/unix by a reader.
+// It might returns an error with partial parsed data, if an error occur after some data parsed.
+func NewNetUnixByReader(reader io.Reader) (*NetUnix, error) {
+	nu := &NetUnix{
+		Rows: make([]*NetUnixLine, 0, 32),
+	}
+	scanner := bufio.NewScanner(reader)
+	// Omit the header line.
+	scanner.Scan()
+	header := scanner.Text()
+	// From the man page of proc(5), it does not contain an Inode field,
+	// but in actually it exists.
+	// This code works for both cases.
+	hasInode := strings.Contains(header, "Inode")
+
+	minFieldsCnt := netUnixStaticFieldsCnt
+	if hasInode {
+		minFieldsCnt++
+	}
+	for scanner.Scan() {
+		line := scanner.Text()
+		item, err := nu.parseLine(line, hasInode, minFieldsCnt)
+		if err != nil {
+			return nu, err
+		}
+		nu.Rows = append(nu.Rows, item)
+	}
+
+	return nu, scanner.Err()
+}
+
+func (u *NetUnix) parseLine(line string, hasInode bool, minFieldsCnt int) (*NetUnixLine, error) {
+	fields := strings.Fields(line)
+	fieldsLen := len(fields)
+	if fieldsLen < minFieldsCnt {
+		return nil, fmt.Errorf(
+			"Parse Unix domain failed: expect at least %d fields but got %d",
+			minFieldsCnt, fieldsLen)
+	}
+	kernelPtr, err := u.parseKernelPtr(fields[netUnixKernelPtrIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain num(%s) failed: %s", fields[netUnixKernelPtrIdx], err)
+	}
+	users, err := u.parseUsers(fields[netUnixRefCountIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain ref count(%s) failed: %s", fields[netUnixRefCountIdx], err)
+	}
+	flags, err := u.parseFlags(fields[netUnixFlagsIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain flags(%s) failed: %s", fields[netUnixFlagsIdx], err)
+	}
+	typ, err := u.parseType(fields[netUnixTypeIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain type(%s) failed: %s", fields[netUnixTypeIdx], err)
+	}
+	state, err := u.parseState(fields[netUnixStateIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain state(%s) failed: %s", fields[netUnixStateIdx], err)
+	}
+	var inode uint64
+	if hasInode {
+		inodeStr := fields[netUnixInodeIdx]
+		inode, err = u.parseInode(inodeStr)
+		if err != nil {
+			return nil, fmt.Errorf("Parse Unix domain inode(%s) failed: %s", inodeStr, err)
+		}
+	}
+
+	nuLine := &NetUnixLine{
+		KernelPtr: kernelPtr,
+		RefCount:  users,
+		Type:      typ,
+		Flags:     flags,
+		State:     state,
+		Inode:     inode,
+	}
+
+	// Path field is optional.
+	if fieldsLen > minFieldsCnt {
+		pathIdx := netUnixInodeIdx + 1
+		if !hasInode {
+			pathIdx--
+		}
+		nuLine.Path = fields[pathIdx]
+	}
+
+	return nuLine, nil
+}
+
+func (u NetUnix) parseKernelPtr(str string) (string, error) {
+	if !strings.HasSuffix(str, ":") {
+		return "", errInvalidKernelPtrFmt
+	}
+	return str[:len(str)-1], nil
+}
+
+func (u NetUnix) parseUsers(hexStr string) (uint64, error) {
+	return strconv.ParseUint(hexStr, 16, 32)
+}
+
+func (u NetUnix) parseProtocol(hexStr string) (uint64, error) {
+	return strconv.ParseUint(hexStr, 16, 32)
+}
+
+func (u NetUnix) parseType(hexStr string) (NetUnixType, error) {
+	typ, err := strconv.ParseUint(hexStr, 16, 16)
+	if err != nil {
+		return 0, err
+	}
+	return NetUnixType(typ), nil
+}
+
+func (u NetUnix) parseFlags(hexStr string) (NetUnixFlags, error) {
+	flags, err := strconv.ParseUint(hexStr, 16, 32)
+	if err != nil {
+		return 0, err
+	}
+	return NetUnixFlags(flags), nil
+}
+
+func (u NetUnix) parseState(hexStr string) (NetUnixState, error) {
+	st, err := strconv.ParseInt(hexStr, 16, 8)
+	if err != nil {
+		return 0, err
+	}
+	return NetUnixState(st), nil
+}
+
+func (u NetUnix) parseInode(inodeStr string) (uint64, error) {
+	return strconv.ParseUint(inodeStr, 10, 64)
+}
+
+func (t NetUnixType) String() string {
+	switch t {
+	case netUnixTypeStream:
+		return "stream"
+	case netUnixTypeDgram:
+		return "dgram"
+	case netUnixTypeSeqpacket:
+		return "seqpacket"
+	}
+	return "unknown"
+}
+
+func (f NetUnixFlags) String() string {
+	switch f {
+	case netUnixFlagListen:
+		return "listen"
+	default:
+		return "default"
+	}
+}
+
+func (s NetUnixState) String() string {
+	switch s {
+	case netUnixStateUnconnected:
+		return "unconnected"
+	case netUnixStateConnecting:
+		return "connecting"
+	case netUnixStateConnected:
+		return "connected"
+	case netUnixStateDisconnected:
+		return "disconnected"
+	}
+	return "unknown"
+}
--- a/vendor/github.com/prometheus/procfs/nfs/nfs.go
+++ b/vendor/github.com/prometheus/procfs/nfs/nfs.go
@ -1,263 +0,0 @@
-// Copyright 2018 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// Package nfs implements parsing of /proc/net/rpc/nfsd.
-// Fields are documented in https://www.svennd.be/nfsd-stats-explained-procnetrpcnfsd/
-package nfs
-
-// ReplyCache models the "rc" line.
-type ReplyCache struct {
-	Hits    uint64
-	Misses  uint64
-	NoCache uint64
-}
-
-// FileHandles models the "fh" line.
-type FileHandles struct {
-	Stale        uint64
-	TotalLookups uint64
-	AnonLookups  uint64
-	DirNoCache   uint64
-	NoDirNoCache uint64
-}
-
-// InputOutput models the "io" line.
-type InputOutput struct {
-	Read  uint64
-	Write uint64
-}
-
-// Threads models the "th" line.
-type Threads struct {
-	Threads uint64
-	FullCnt uint64
-}
-
-// ReadAheadCache models the "ra" line.
-type ReadAheadCache struct {
-	CacheSize      uint64
-	CacheHistogram []uint64
-	NotFound       uint64
-}
-
-// Network models the "net" line.
-type Network struct {
-	NetCount   uint64
-	UDPCount   uint64
-	TCPCount   uint64
-	TCPConnect uint64
-}
-
-// ClientRPC models the nfs "rpc" line.
-type ClientRPC struct {
-	RPCCount        uint64
-	Retransmissions uint64
-	AuthRefreshes   uint64
-}
-
-// ServerRPC models the nfsd "rpc" line.
-type ServerRPC struct {
-	RPCCount uint64
-	BadCnt   uint64
-	BadFmt   uint64
-	BadAuth  uint64
-	BadcInt  uint64
-}
-
-// V2Stats models the "proc2" line.
-type V2Stats struct {
-	Null     uint64
-	GetAttr  uint64
-	SetAttr  uint64
-	Root     uint64
-	Lookup   uint64
-	ReadLink uint64
-	Read     uint64
-	WrCache  uint64
-	Write    uint64
-	Create   uint64
-	Remove   uint64
-	Rename   uint64
-	Link     uint64
-	SymLink  uint64
-	MkDir    uint64
-	RmDir    uint64
-	ReadDir  uint64
-	FsStat   uint64
-}
-
-// V3Stats models the "proc3" line.
-type V3Stats struct {
-	Null        uint64
-	GetAttr     uint64
-	SetAttr     uint64
-	Lookup      uint64
-	Access      uint64
-	ReadLink    uint64
-	Read        uint64
-	Write       uint64
-	Create      uint64
-	MkDir       uint64
-	SymLink     uint64
-	MkNod       uint64
-	Remove      uint64
-	RmDir       uint64
-	Rename      uint64
-	Link        uint64
-	ReadDir     uint64
-	ReadDirPlus uint64
-	FsStat      uint64
-	FsInfo      uint64
-	PathConf    uint64
-	Commit      uint64
-}
-
-// ClientV4Stats models the nfs "proc4" line.
-type ClientV4Stats struct {
-	Null               uint64
-	Read               uint64
-	Write              uint64
-	Commit             uint64
-	Open               uint64
-	OpenConfirm        uint64
-	OpenNoattr         uint64
-	OpenDowngrade      uint64
-	Close              uint64
-	Setattr            uint64
-	FsInfo             uint64
-	Renew              uint64
-	SetClientID        uint64
-	SetClientIDConfirm uint64
-	Lock               uint64
-	Lockt              uint64
-	Locku              uint64
-	Access             uint64
-	Getattr            uint64
-	Lookup             uint64
-	LookupRoot         uint64
-	Remove             uint64
-	Rename             uint64
-	Link               uint64
-	Symlink            uint64
-	Create             uint64
-	Pathconf           uint64
-	StatFs             uint64
-	ReadLink           uint64
-	ReadDir            uint64
-	ServerCaps         uint64
-	DelegReturn        uint64
-	GetACL             uint64
-	SetACL             uint64
-	FsLocations        uint64
-	ReleaseLockowner   uint64
-	Secinfo            uint64
-	FsidPresent        uint64
-	ExchangeID         uint64
-	CreateSession      uint64
-	DestroySession     uint64
-	Sequence           uint64
-	GetLeaseTime       uint64
-	ReclaimComplete    uint64
-	LayoutGet          uint64
-	GetDeviceInfo      uint64
-	LayoutCommit       uint64
-	LayoutReturn       uint64
-	SecinfoNoName      uint64
-	TestStateID        uint64
-	FreeStateID        uint64
-	GetDeviceList      uint64
-	BindConnToSession  uint64
-	DestroyClientID    uint64
-	Seek               uint64
-	Allocate           uint64
-	DeAllocate         uint64
-	LayoutStats        uint64
-	Clone              uint64
-}
-
-// ServerV4Stats models the nfsd "proc4" line.
-type ServerV4Stats struct {
-	Null     uint64
-	Compound uint64
-}
-
-// V4Ops models the "proc4ops" line: NFSv4 operations
-// Variable list, see:
-// v4.0 https://tools.ietf.org/html/rfc3010 (38 operations)
-// v4.1 https://tools.ietf.org/html/rfc5661 (58 operations)
-// v4.2 https://tools.ietf.org/html/draft-ietf-nfsv4-minorversion2-41 (71 operations)
-type V4Ops struct {
-	//Values       uint64 // Variable depending on v4.x sub-version. TODO: Will this always at least include the fields in this struct?
-	Op0Unused    uint64
-	Op1Unused    uint64
-	Op2Future    uint64
-	Access       uint64
-	Close        uint64
-	Commit       uint64
-	Create       uint64
-	DelegPurge   uint64
-	DelegReturn  uint64
-	GetAttr      uint64
-	GetFH        uint64
-	Link         uint64
-	Lock         uint64
-	Lockt        uint64
-	Locku        uint64
-	Lookup       uint64
-	LookupRoot   uint64
-	Nverify      uint64
-	Open         uint64
-	OpenAttr     uint64
-	OpenConfirm  uint64
-	OpenDgrd     uint64
-	PutFH        uint64
-	PutPubFH     uint64
-	PutRootFH    uint64
-	Read         uint64
-	ReadDir      uint64
-	ReadLink     uint64
-	Remove       uint64
-	Rename       uint64
-	Renew        uint64
-	RestoreFH    uint64
-	SaveFH       uint64
-	SecInfo      uint64
-	SetAttr      uint64
-	Verify       uint64
-	Write        uint64
-	RelLockOwner uint64
-}
-
-// ClientRPCStats models all stats from /proc/net/rpc/nfs.
-type ClientRPCStats struct {
-	Network       Network
-	ClientRPC     ClientRPC
-	V2Stats       V2Stats
-	V3Stats       V3Stats
-	ClientV4Stats ClientV4Stats
-}
-
-// ServerRPCStats models all stats from /proc/net/rpc/nfsd.
-type ServerRPCStats struct {
-	ReplyCache     ReplyCache
-	FileHandles    FileHandles
-	InputOutput    InputOutput
-	Threads        Threads
-	ReadAheadCache ReadAheadCache
-	Network        Network
-	ServerRPC      ServerRPC
-	V2Stats        V2Stats
-	V3Stats        V3Stats
-	ServerV4Stats  ServerV4Stats
-	V4Ops          V4Ops
-}
--- a/vendor/github.com/prometheus/procfs/nfs/parse.go
+++ b/vendor/github.com/prometheus/procfs/nfs/parse.go
@ -1,317 +0,0 @@
-// Copyright 2018 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package nfs
-
-import (
-	"fmt"
-)
-
-func parseReplyCache(v []uint64) (ReplyCache, error) {
-	if len(v) != 3 {
-		return ReplyCache{}, fmt.Errorf("invalid ReplyCache line %q", v)
-	}
-
-	return ReplyCache{
-		Hits:    v[0],
-		Misses:  v[1],
-		NoCache: v[2],
-	}, nil
-}
-
-func parseFileHandles(v []uint64) (FileHandles, error) {
-	if len(v) != 5 {
-		return FileHandles{}, fmt.Errorf("invalid FileHandles, line %q", v)
-	}
-
-	return FileHandles{
-		Stale:        v[0],
-		TotalLookups: v[1],
-		AnonLookups:  v[2],
-		DirNoCache:   v[3],
-		NoDirNoCache: v[4],
-	}, nil
-}
-
-func parseInputOutput(v []uint64) (InputOutput, error) {
-	if len(v) != 2 {
-		return InputOutput{}, fmt.Errorf("invalid InputOutput line %q", v)
-	}
-
-	return InputOutput{
-		Read:  v[0],
-		Write: v[1],
-	}, nil
-}
-
-func parseThreads(v []uint64) (Threads, error) {
-	if len(v) != 2 {
-		return Threads{}, fmt.Errorf("invalid Threads line %q", v)
-	}
-
-	return Threads{
-		Threads: v[0],
-		FullCnt: v[1],
-	}, nil
-}
-
-func parseReadAheadCache(v []uint64) (ReadAheadCache, error) {
-	if len(v) != 12 {
-		return ReadAheadCache{}, fmt.Errorf("invalid ReadAheadCache line %q", v)
-	}
-
-	return ReadAheadCache{
-		CacheSize:      v[0],
-		CacheHistogram: v[1:11],
-		NotFound:       v[11],
-	}, nil
-}
-
-func parseNetwork(v []uint64) (Network, error) {
-	if len(v) != 4 {
-		return Network{}, fmt.Errorf("invalid Network line %q", v)
-	}
-
-	return Network{
-		NetCount:   v[0],
-		UDPCount:   v[1],
-		TCPCount:   v[2],
-		TCPConnect: v[3],
-	}, nil
-}
-
-func parseServerRPC(v []uint64) (ServerRPC, error) {
-	if len(v) != 5 {
-		return ServerRPC{}, fmt.Errorf("invalid RPC line %q", v)
-	}
-
-	return ServerRPC{
-		RPCCount: v[0],
-		BadCnt:   v[1],
-		BadFmt:   v[2],
-		BadAuth:  v[3],
-		BadcInt:  v[4],
-	}, nil
-}
-
-func parseClientRPC(v []uint64) (ClientRPC, error) {
-	if len(v) != 3 {
-		return ClientRPC{}, fmt.Errorf("invalid RPC line %q", v)
-	}
-
-	return ClientRPC{
-		RPCCount:        v[0],
-		Retransmissions: v[1],
-		AuthRefreshes:   v[2],
-	}, nil
-}
-
-func parseV2Stats(v []uint64) (V2Stats, error) {
-	values := int(v[0])
-	if len(v[1:]) != values || values != 18 {
-		return V2Stats{}, fmt.Errorf("invalid V2Stats line %q", v)
-	}
-
-	return V2Stats{
-		Null:     v[1],
-		GetAttr:  v[2],
-		SetAttr:  v[3],
-		Root:     v[4],
-		Lookup:   v[5],
-		ReadLink: v[6],
-		Read:     v[7],
-		WrCache:  v[8],
-		Write:    v[9],
-		Create:   v[10],
-		Remove:   v[11],
-		Rename:   v[12],
-		Link:     v[13],
-		SymLink:  v[14],
-		MkDir:    v[15],
-		RmDir:    v[16],
-		ReadDir:  v[17],
-		FsStat:   v[18],
-	}, nil
-}
-
-func parseV3Stats(v []uint64) (V3Stats, error) {
-	values := int(v[0])
-	if len(v[1:]) != values || values != 22 {
-		return V3Stats{}, fmt.Errorf("invalid V3Stats line %q", v)
-	}
-
-	return V3Stats{
-		Null:        v[1],
-		GetAttr:     v[2],
-		SetAttr:     v[3],
-		Lookup:      v[4],
-		Access:      v[5],
-		ReadLink:    v[6],
-		Read:        v[7],
-		Write:       v[8],
-		Create:      v[9],
-		MkDir:       v[10],
-		SymLink:     v[11],
-		MkNod:       v[12],
-		Remove:      v[13],
-		RmDir:       v[14],
-		Rename:      v[15],
-		Link:        v[16],
-		ReadDir:     v[17],
-		ReadDirPlus: v[18],
-		FsStat:      v[19],
-		FsInfo:      v[20],
-		PathConf:    v[21],
-		Commit:      v[22],
-	}, nil
-}
-
-func parseClientV4Stats(v []uint64) (ClientV4Stats, error) {
-	values := int(v[0])
-	if len(v[1:]) != values {
-		return ClientV4Stats{}, fmt.Errorf("invalid ClientV4Stats line %q", v)
-	}
-
-	// This function currently supports mapping 59 NFS v4 client stats.  Older
-	// kernels may emit fewer stats, so we must detect this and pad out the
-	// values to match the expected slice size.
-	if values < 59 {
-		newValues := make([]uint64, 60)
-		copy(newValues, v)
-		v = newValues
-	}
-
-	return ClientV4Stats{
-		Null:               v[1],
-		Read:               v[2],
-		Write:              v[3],
-		Commit:             v[4],
-		Open:               v[5],
-		OpenConfirm:        v[6],
-		OpenNoattr:         v[7],
-		OpenDowngrade:      v[8],
-		Close:              v[9],
-		Setattr:            v[10],
-		FsInfo:             v[11],
-		Renew:              v[12],
-		SetClientID:        v[13],
-		SetClientIDConfirm: v[14],
-		Lock:               v[15],
-		Lockt:              v[16],
-		Locku:              v[17],
-		Access:             v[18],
-		Getattr:            v[19],
-		Lookup:             v[20],
-		LookupRoot:         v[21],
-		Remove:             v[22],
-		Rename:             v[23],
-		Link:               v[24],
-		Symlink:            v[25],
-		Create:             v[26],
-		Pathconf:           v[27],
-		StatFs:             v[28],
-		ReadLink:           v[29],
-		ReadDir:            v[30],
-		ServerCaps:         v[31],
-		DelegReturn:        v[32],
-		GetACL:             v[33],
-		SetACL:             v[34],
-		FsLocations:        v[35],
-		ReleaseLockowner:   v[36],
-		Secinfo:            v[37],
-		FsidPresent:        v[38],
-		ExchangeID:         v[39],
-		CreateSession:      v[40],
-		DestroySession:     v[41],
-		Sequence:           v[42],
-		GetLeaseTime:       v[43],
-		ReclaimComplete:    v[44],
-		LayoutGet:          v[45],
-		GetDeviceInfo:      v[46],
-		LayoutCommit:       v[47],
-		LayoutReturn:       v[48],
-		SecinfoNoName:      v[49],
-		TestStateID:        v[50],
-		FreeStateID:        v[51],
-		GetDeviceList:      v[52],
-		BindConnToSession:  v[53],
-		DestroyClientID:    v[54],
-		Seek:               v[55],
-		Allocate:           v[56],
-		DeAllocate:         v[57],
-		LayoutStats:        v[58],
-		Clone:              v[59],
-	}, nil
-}
-
-func parseServerV4Stats(v []uint64) (ServerV4Stats, error) {
-	values := int(v[0])
-	if len(v[1:]) != values || values != 2 {
-		return ServerV4Stats{}, fmt.Errorf("invalid V4Stats line %q", v)
-	}
-
-	return ServerV4Stats{
-		Null:     v[1],
-		Compound: v[2],
-	}, nil
-}
-
-func parseV4Ops(v []uint64) (V4Ops, error) {
-	values := int(v[0])
-	if len(v[1:]) != values || values < 39 {
-		return V4Ops{}, fmt.Errorf("invalid V4Ops line %q", v)
-	}
-
-	stats := V4Ops{
-		Op0Unused:    v[1],
-		Op1Unused:    v[2],
-		Op2Future:    v[3],
-		Access:       v[4],
-		Close:        v[5],
-		Commit:       v[6],
-		Create:       v[7],
-		DelegPurge:   v[8],
-		DelegReturn:  v[9],
-		GetAttr:      v[10],
-		GetFH:        v[11],
-		Link:         v[12],
-		Lock:         v[13],
-		Lockt:        v[14],
-		Locku:        v[15],
-		Lookup:       v[16],
-		LookupRoot:   v[17],
-		Nverify:      v[18],
-		Open:         v[19],
-		OpenAttr:     v[20],
-		OpenConfirm:  v[21],
-		OpenDgrd:     v[22],
-		PutFH:        v[23],
-		PutPubFH:     v[24],
-		PutRootFH:    v[25],
-		Read:         v[26],
-		ReadDir:      v[27],
-		ReadLink:     v[28],
-		Remove:       v[29],
-		Rename:       v[30],
-		Renew:        v[31],
-		RestoreFH:    v[32],
-		SaveFH:       v[33],
-		SecInfo:      v[34],
-		SetAttr:      v[35],
-		Verify:       v[36],
-		Write:        v[37],
-		RelLockOwner: v[38],
-	}
-
-	return stats, nil
-}
--- a/vendor/github.com/prometheus/procfs/nfs/parse_nfs.go
+++ b/vendor/github.com/prometheus/procfs/nfs/parse_nfs.go
@ -1,67 +0,0 @@
-// Copyright 2018 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package nfs
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-	"strings"
-
-	"github.com/prometheus/procfs/internal/util"
-)
-
-// ParseClientRPCStats returns stats read from /proc/net/rpc/nfs
-func ParseClientRPCStats(r io.Reader) (*ClientRPCStats, error) {
-	stats := &ClientRPCStats{}
-
-	scanner := bufio.NewScanner(r)
-	for scanner.Scan() {
-		line := scanner.Text()
-		parts := strings.Fields(scanner.Text())
-		// require at least <key> <value>
-		if len(parts) < 2 {
-			return nil, fmt.Errorf("invalid NFS metric line %q", line)
-		}
-
-		values, err := util.ParseUint64s(parts[1:])
-		if err != nil {
-			return nil, fmt.Errorf("error parsing NFS metric line: %s", err)
-		}
-
-		switch metricLine := parts[0]; metricLine {
-		case "net":
-			stats.Network, err = parseNetwork(values)
-		case "rpc":
-			stats.ClientRPC, err = parseClientRPC(values)
-		case "proc2":
-			stats.V2Stats, err = parseV2Stats(values)
-		case "proc3":
-			stats.V3Stats, err = parseV3Stats(values)
-		case "proc4":
-			stats.ClientV4Stats, err = parseClientV4Stats(values)
-		default:
-			return nil, fmt.Errorf("unknown NFS metric line %q", metricLine)
-		}
-		if err != nil {
-			return nil, fmt.Errorf("errors parsing NFS metric line: %s", err)
-		}
-	}
-
-	if err := scanner.Err(); err != nil {
-		return nil, fmt.Errorf("error scanning NFS file: %s", err)
-	}
-
-	return stats, nil
-}
--- a/vendor/github.com/prometheus/procfs/nfs/parse_nfsd.go
+++ b/vendor/github.com/prometheus/procfs/nfs/parse_nfsd.go
@ -1,89 +0,0 @@
-// Copyright 2018 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package nfs
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-	"strings"
-
-	"github.com/prometheus/procfs/internal/util"
-)
-
-// ParseServerRPCStats returns stats read from /proc/net/rpc/nfsd
-func ParseServerRPCStats(r io.Reader) (*ServerRPCStats, error) {
-	stats := &ServerRPCStats{}
-
-	scanner := bufio.NewScanner(r)
-	for scanner.Scan() {
-		line := scanner.Text()
-		parts := strings.Fields(scanner.Text())
-		// require at least <key> <value>
-		if len(parts) < 2 {
-			return nil, fmt.Errorf("invalid NFSd metric line %q", line)
-		}
-		label := parts[0]
-
-		var values []uint64
-		var err error
-		if label == "th" {
-			if len(parts) < 3 {
-				return nil, fmt.Errorf("invalid NFSd th metric line %q", line)
-			}
-			values, err = util.ParseUint64s(parts[1:3])
-		} else {
-			values, err = util.ParseUint64s(parts[1:])
-		}
-		if err != nil {
-			return nil, fmt.Errorf("error parsing NFSd metric line: %s", err)
-		}
-
-		switch metricLine := parts[0]; metricLine {
-		case "rc":
-			stats.ReplyCache, err = parseReplyCache(values)
-		case "fh":
-			stats.FileHandles, err = parseFileHandles(values)
-		case "io":
-			stats.InputOutput, err = parseInputOutput(values)
-		case "th":
-			stats.Threads, err = parseThreads(values)
-		case "ra":
-			stats.ReadAheadCache, err = parseReadAheadCache(values)
-		case "net":
-			stats.Network, err = parseNetwork(values)
-		case "rpc":
-			stats.ServerRPC, err = parseServerRPC(values)
-		case "proc2":
-			stats.V2Stats, err = parseV2Stats(values)
-		case "proc3":
-			stats.V3Stats, err = parseV3Stats(values)
-		case "proc4":
-			stats.ServerV4Stats, err = parseServerV4Stats(values)
-		case "proc4ops":
-			stats.V4Ops, err = parseV4Ops(values)
-		default:
-			return nil, fmt.Errorf("unknown NFSd metric line %q", metricLine)
-		}
-		if err != nil {
-			return nil, fmt.Errorf("errors parsing NFSd metric line: %s", err)
-		}
-	}
-
-	if err := scanner.Err(); err != nil {
-		return nil, fmt.Errorf("error scanning NFSd file: %s", err)
-	}
-
-	return stats, nil
-}
--- a/vendor/github.com/prometheus/procfs/proc.go
+++ b/vendor/github.com/prometheus/procfs/proc.go
@ -20,6 +20,8 @@ import (
 	"os"
 	"strconv"
 	"strings"
+
+	"github.com/prometheus/procfs/internal/fs"
 )

 // Proc provides information about a running process.
@ -27,7 +29,7 @@ type Proc struct {
 	// The process ID.
 	PID int

-	fs FS
+	fs fs.FS
 }

 // Procs represents a list of Proc structs.
@ -52,7 +54,7 @@ func NewProc(pid int) (Proc, error) {
 	if err != nil {
 		return Proc{}, err
 	}
-	return fs.NewProc(pid)
+	return fs.Proc(pid)
 }

 // AllProcs returns a list of all currently available processes under /proc.
@ -66,28 +68,35 @@ func AllProcs() (Procs, error) {

 // Self returns a process for the current process.
 func (fs FS) Self() (Proc, error) {
-	p, err := os.Readlink(fs.Path("self"))
+	p, err := os.Readlink(fs.proc.Path("self"))
 	if err != nil {
 		return Proc{}, err
 	}
-	pid, err := strconv.Atoi(strings.Replace(p, string(fs), "", -1))
+	pid, err := strconv.Atoi(strings.Replace(p, string(fs.proc), "", -1))
 	if err != nil {
 		return Proc{}, err
 	}
-	return fs.NewProc(pid)
+	return fs.Proc(pid)
 }

 // NewProc returns a process for the given pid.
+//
+// Deprecated: use fs.Proc() instead
 func (fs FS) NewProc(pid int) (Proc, error) {
-	if _, err := os.Stat(fs.Path(strconv.Itoa(pid))); err != nil {
+	return fs.Proc(pid)
+}
+
+// Proc returns a process for the given pid.
+func (fs FS) Proc(pid int) (Proc, error) {
+	if _, err := os.Stat(fs.proc.Path(strconv.Itoa(pid))); err != nil {
 		return Proc{}, err
 	}
-	return Proc{PID: pid, fs: fs}, nil
+	return Proc{PID: pid, fs: fs.proc}, nil
 }

 // AllProcs returns a list of all currently available processes.
 func (fs FS) AllProcs() (Procs, error) {
-	d, err := os.Open(fs.Path())
+	d, err := os.Open(fs.proc.Path())
 	if err != nil {
 		return Procs{}, err
 	}
@ -104,7 +113,7 @@ func (fs FS) AllProcs() (Procs, error) {
 		if err != nil {
 			continue
 		}
-		p = append(p, Proc{PID: int(pid), fs: fs})
+		p = append(p, Proc{PID: int(pid), fs: fs.proc})
 	}

 	return p, nil
--- a/vendor/github.com/prometheus/procfs/proc_io.go
+++ b/vendor/github.com/prometheus/procfs/proc_io.go
@ -39,8 +39,8 @@ type ProcIO struct {
 	CancelledWriteBytes int64
 }

-// NewIO creates a new ProcIO instance from a given Proc instance.
-func (p Proc) NewIO() (ProcIO, error) {
+// IO creates a new ProcIO instance from a given Proc instance.
+func (p Proc) IO() (ProcIO, error) {
 	pio := ProcIO{}

 	f, err := os.Open(p.path("io"))
--- a/vendor/github.com/prometheus/procfs/proc_limits.go
+++ b/vendor/github.com/prometheus/procfs/proc_limits.go
@ -78,7 +78,14 @@ var (
 )

 // NewLimits returns the current soft limits of the process.
+//
+// Deprecated: use p.Limits() instead
 func (p Proc) NewLimits() (ProcLimits, error) {
+	return p.Limits()
+}
+
+// Limits returns the current soft limits of the process.
+func (p Proc) Limits() (ProcLimits, error) {
 	f, err := os.Open(p.path("limits"))
 	if err != nil {
 		return ProcLimits{}, err
--- a/vendor/github.com/prometheus/procfs/proc_ns.go
+++ b/vendor/github.com/prometheus/procfs/proc_ns.go
@ -29,9 +29,9 @@ type Namespace struct {
 // Namespaces contains all of the namespaces that the process is contained in.
 type Namespaces map[string]Namespace

-// NewNamespaces reads from /proc/[pid/ns/* to get the namespaces of which the
+// Namespaces reads from /proc/<pid>/ns/* to get the namespaces of which the
 // process is a member.
-func (p Proc) NewNamespaces() (Namespaces, error) {
+func (p Proc) Namespaces() (Namespaces, error) {
 	d, err := os.Open(p.path("ns"))
 	if err != nil {
 		return nil, err
--- a/vendor/github.com/prometheus/procfs/proc_psi.go
+++ b/vendor/github.com/prometheus/procfs/proc_psi.go
@ -0,0 +1,101 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package procfs
+
+// The PSI / pressure interface is described at
+//   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/accounting/psi.txt
+// Each resource (cpu, io, memory, ...) is exposed as a single file.
+// Each file may contain up to two lines, one for "some" pressure and one for "full" pressure.
+// Each line contains several averages (over n seconds) and a total in µs.
+//
+// Example io pressure file:
+// > some avg10=0.06 avg60=0.21 avg300=0.99 total=8537362
+// > full avg10=0.00 avg60=0.13 avg300=0.96 total=8183134
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+const lineFormat = "avg10=%f avg60=%f avg300=%f total=%d"
+
+// PSILine is a single line of values as returned by /proc/pressure/*
+// The Avg entries are averages over n seconds, as a percentage
+// The Total line is in microseconds
+type PSILine struct {
+	Avg10  float64
+	Avg60  float64
+	Avg300 float64
+	Total  uint64
+}
+
+// PSIStats represent pressure stall information from /proc/pressure/*
+// Some indicates the share of time in which at least some tasks are stalled
+// Full indicates the share of time in which all non-idle tasks are stalled simultaneously
+type PSIStats struct {
+	Some *PSILine
+	Full *PSILine
+}
+
+// PSIStatsForResource reads pressure stall information for the specified
+// resource from /proc/pressure/<resource>. At time of writing this can be
+// either "cpu", "memory" or "io".
+func (fs FS) PSIStatsForResource(resource string) (PSIStats, error) {
+	file, err := os.Open(fs.proc.Path(fmt.Sprintf("%s/%s", "pressure", resource)))
+	if err != nil {
+		return PSIStats{}, fmt.Errorf("psi_stats: unavailable for %s", resource)
+	}
+
+	defer file.Close()
+	return parsePSIStats(resource, file)
+}
+
+// parsePSIStats parses the specified file for pressure stall information
+func parsePSIStats(resource string, file io.Reader) (PSIStats, error) {
+	psiStats := PSIStats{}
+	stats, err := ioutil.ReadAll(file)
+	if err != nil {
+		return psiStats, fmt.Errorf("psi_stats: unable to read data for %s", resource)
+	}
+
+	for _, l := range strings.Split(string(stats), "\n") {
+		prefix := strings.Split(l, " ")[0]
+		switch prefix {
+		case "some":
+			psi := PSILine{}
+			_, err := fmt.Sscanf(l, fmt.Sprintf("some %s", lineFormat), &psi.Avg10, &psi.Avg60, &psi.Avg300, &psi.Total)
+			if err != nil {
+				return PSIStats{}, err
+			}
+			psiStats.Some = &psi
+		case "full":
+			psi := PSILine{}
+			_, err := fmt.Sscanf(l, fmt.Sprintf("full %s", lineFormat), &psi.Avg10, &psi.Avg60, &psi.Avg300, &psi.Total)
+			if err != nil {
+				return PSIStats{}, err
+			}
+			psiStats.Full = &psi
+		default:
+			// If we encounter a line with an unknown prefix, ignore it and move on
+			// Should new measurement types be added in the future we'll simply ignore them instead
+			// of erroring on retrieval
+			continue
+		}
+	}
+
+	return psiStats, nil
+}
--- a/vendor/github.com/prometheus/procfs/proc_stat.go
+++ b/vendor/github.com/prometheus/procfs/proc_stat.go
@ -18,6 +18,8 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+
+	"github.com/prometheus/procfs/internal/fs"
 )

 // Originally, this USER_HZ value was dynamically retrieved via a sysconf call
@ -95,15 +97,22 @@ type ProcStat struct {
 	// in clock ticks.
 	Starttime uint64
 	// Virtual memory size in bytes.
-	VSize int
+	VSize uint
 	// Resident set size in pages.
 	RSS int

-	fs FS
+	proc fs.FS
 }

 // NewStat returns the current status information of the process.
+//
+// Deprecated: use NewStat() instead
 func (p Proc) NewStat() (ProcStat, error) {
+	return p.Stat()
+}
+
+// Stat returns the current status information of the process.
+func (p Proc) Stat() (ProcStat, error) {
 	f, err := os.Open(p.path("stat"))
 	if err != nil {
 		return ProcStat{}, err
@ -118,7 +127,7 @@ func (p Proc) NewStat() (ProcStat, error) {
 	var (
 		ignore int

-		s = ProcStat{PID: p.PID, fs: p.fs}
+		s = ProcStat{PID: p.PID, proc: p.fs}
 		l = bytes.Index(data, []byte("("))
 		r = bytes.LastIndex(data, []byte(")"))
 	)
@ -164,7 +173,7 @@ func (p Proc) NewStat() (ProcStat, error) {
 }

 // VirtualMemory returns the virtual memory size in bytes.
-func (s ProcStat) VirtualMemory() int {
+func (s ProcStat) VirtualMemory() uint {
 	return s.VSize
 }

@ -175,7 +184,8 @@ func (s ProcStat) ResidentMemory() int {

 // StartTime returns the unix timestamp of the process in seconds.
 func (s ProcStat) StartTime() (float64, error) {
-	stat, err := s.fs.NewStat()
+	fs := FS{proc: s.proc}
+	stat, err := fs.Stat()
 	if err != nil {
 		return 0, err
 	}
--- a/vendor/github.com/prometheus/procfs/proc_status.go
+++ b/vendor/github.com/prometheus/procfs/proc_status.go
@ -0,0 +1,162 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package procfs
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// ProcStat provides status information about the process,
+// read from /proc/[pid]/stat.
+type ProcStatus struct {
+	// The process ID.
+	PID int
+	// The process name.
+	Name string
+
+	// Peak virtual memory size.
+	VmPeak uint64
+	// Virtual memory size.
+	VmSize uint64
+	// Locked memory size.
+	VmLck uint64
+	// Pinned memory size.
+	VmPin uint64
+	// Peak resident set size.
+	VmHWM uint64
+	// Resident set size (sum of RssAnnon RssFile and RssShmem).
+	VmRSS uint64
+	// Size of resident anonymous memory.
+	RssAnon uint64
+	// Size of resident file mappings.
+	RssFile uint64
+	// Size of resident shared memory.
+	RssShmem uint64
+	// Size of data segments.
+	VmData uint64
+	// Size of stack segments.
+	VmStk uint64
+	// Size of text segments.
+	VmExe uint64
+	// Shared library code size.
+	VmLib uint64
+	// Page table entries size.
+	VmPTE uint64
+	// Size of second-level page tables.
+	VmPMD uint64
+	// Swapped-out virtual memory size by anonymous private.
+	VmSwap uint64
+	// Size of hugetlb memory portions
+	HugetlbPages uint64
+
+	// Number of voluntary context switches.
+	VoluntaryCtxtSwitches uint64
+	// Number of involuntary context switches.
+	NonVoluntaryCtxtSwitches uint64
+}
+
+// NewStatus returns the current status information of the process.
+func (p Proc) NewStatus() (ProcStatus, error) {
+	f, err := os.Open(p.path("status"))
+	if err != nil {
+		return ProcStatus{}, err
+	}
+	defer f.Close()
+
+	data, err := ioutil.ReadAll(f)
+	if err != nil {
+		return ProcStatus{}, err
+	}
+
+	s := ProcStatus{PID: p.PID}
+
+	lines := strings.Split(string(data), "\n")
+	for _, line := range lines {
+		if !bytes.Contains([]byte(line), []byte(":")) {
+			continue
+		}
+
+		kv := strings.SplitN(line, ":", 2)
+
+		// removes spaces
+		k := string(strings.TrimSpace(kv[0]))
+		v := string(strings.TrimSpace(kv[1]))
+		// removes "kB"
+		v = string(bytes.Trim([]byte(v), " kB"))
+
+		// value to int when possible
+		// we can skip error check here, 'cause vKBytes is not used when value is a string
+		vKBytes, _ := strconv.ParseUint(v, 10, 64)
+		// convert kB to B
+		vBytes := vKBytes * 1024
+
+		s.fillStatus(k, v, vKBytes, vBytes)
+	}
+
+	return s, nil
+}
+
+func (s *ProcStatus) fillStatus(k string, vString string, vUint uint64, vUintBytes uint64) {
+	switch k {
+	case "Name":
+		s.Name = vString
+	case "VmPeak":
+		s.VmPeak = vUintBytes
+	case "VmSize":
+		s.VmSize = vUintBytes
+	case "VmLck":
+		s.VmLck = vUintBytes
+	case "VmPin":
+		s.VmPin = vUintBytes
+	case "VmHWM":
+		s.VmHWM = vUintBytes
+	case "VmRSS":
+		s.VmRSS = vUintBytes
+	case "RssAnon":
+		s.RssAnon = vUintBytes
+	case "RssFile":
+		s.RssFile = vUintBytes
+	case "RssShmem":
+		s.RssShmem = vUintBytes
+	case "VmData":
+		s.VmData = vUintBytes
+	case "VmStk":
+		s.VmStk = vUintBytes
+	case "VmExe":
+		s.VmExe = vUintBytes
+	case "VmLib":
+		s.VmLib = vUintBytes
+	case "VmPTE":
+		s.VmPTE = vUintBytes
+	case "VmPMD":
+		s.VmPMD = vUintBytes
+	case "VmSwap":
+		s.VmSwap = vUintBytes
+	case "HugetlbPages":
+		s.HugetlbPages = vUintBytes
+	case "voluntary_ctxt_switches":
+		s.VoluntaryCtxtSwitches = vUint
+	case "nonvoluntary_ctxt_switches":
+		s.NonVoluntaryCtxtSwitches = vUint
+	}
+}
+
+// TotalCtxtSwitches returns the total context switch.
+func (s ProcStatus) TotalCtxtSwitches() uint64 {
+	return s.VoluntaryCtxtSwitches + s.NonVoluntaryCtxtSwitches
+}
--- a/vendor/github.com/prometheus/procfs/stat.go
+++ b/vendor/github.com/prometheus/procfs/stat.go
@ -20,6 +20,8 @@ import (
 	"os"
 	"strconv"
 	"strings"
+
+	"github.com/prometheus/procfs/internal/fs"
 )

 // CPUStat shows how much time the cpu spend in various stages.
@ -78,16 +80,6 @@ type Stat struct {
 	SoftIRQ SoftIRQStat
 }

-// NewStat returns kernel/system statistics read from /proc/stat.
-func NewStat() (Stat, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return Stat{}, err
-	}
-
-	return fs.NewStat()
-}
-
 // Parse a cpu statistics line and returns the CPUStat struct plus the cpu id (or -1 for the overall sum).
 func parseCPUStat(line string) (CPUStat, int64, error) {
 	cpuStat := CPUStat{}
@ -149,11 +141,31 @@ func parseSoftIRQStat(line string) (SoftIRQStat, uint64, error) {
 	return softIRQStat, total, nil
 }

-// NewStat returns an information about current kernel/system statistics.
-func (fs FS) NewStat() (Stat, error) {
-	// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
+// NewStat returns information about current cpu/process statistics.
+// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
+//
+// Deprecated: use fs.Stat() instead
+func NewStat() (Stat, error) {
+	fs, err := NewFS(fs.DefaultProcMountPoint)
+	if err != nil {
+		return Stat{}, err
+	}
+	return fs.Stat()
+}

-	f, err := os.Open(fs.Path("stat"))
+// NewStat returns information about current cpu/process statistics.
+// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
+//
+// Deprecated: use fs.Stat() instead
+func (fs FS) NewStat() (Stat, error) {
+	return fs.Stat()
+}
+
+// Stat returns information about current cpu/process statistics.
+// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
+func (fs FS) Stat() (Stat, error) {
+
+	f, err := os.Open(fs.proc.Path("stat"))
 	if err != nil {
 		return Stat{}, err
 	}
--- a/vendor/github.com/prometheus/procfs/ttar
+++ b/vendor/github.com/prometheus/procfs/ttar
@ -86,8 +86,10 @@ Usage:   $bname [-C <DIR>] -c -f <ARCHIVE> <FILE...> (create archive)
         $bname [-C <DIR>] -x -f <ARCHIVE>           (extract archive)

 Options:
-         -C <DIR>                                    (change directory)
-         -v                                          (verbose)
+         -C <DIR>           (change directory)
+         -v                 (verbose)
+         --recursive-unlink (recursively delete existing directory if path
+                             collides with file or directory to extract)

 Example: Change to sysfs directory, create ttar file from fixtures directory
         $bname -C sysfs -c -f sysfs/fixtures.ttar fixtures/
@ -111,8 +113,9 @@ function set_cmd {
 }

 unset VERBOSE
+unset RECURSIVE_UNLINK

-while getopts :cf:htxvC: opt; do
+while getopts :cf:-:htxvC: opt; do
    case $opt in
        c)
            set_cmd "create"
@ -136,6 +139,18 @@ while getopts :cf:htxvC: opt; do
        C)
            CDIR=$OPTARG
            ;;
+        -)
+            case $OPTARG in
+                recursive-unlink)
+                    RECURSIVE_UNLINK="yes"
+                    ;;
+                *)
+                    echo -e "Error: invalid option -$OPTARG"
+                    echo
+                    usage 1
+                    ;;
+            esac
+            ;;
        *)
            echo >&2 "ERROR: invalid option -$OPTARG"
            echo
@ -212,16 +227,16 @@ function extract {
        local eof_without_newline
        if [ "$size" -gt 0 ]; then
            if [[ "$line" =~ [^\\]EOF ]]; then
-                # An EOF not preceeded by a backslash indicates that the line
+                # An EOF not preceded by a backslash indicates that the line
                # does not end with a newline
                eof_without_newline=1
            else
                eof_without_newline=0
            fi
            # Replace NULLBYTE with null byte if at beginning of line
-            # Replace NULLBYTE with null byte unless preceeded by backslash
+            # Replace NULLBYTE with null byte unless preceded by backslash
            # Remove one backslash in front of NULLBYTE (if any)
-            # Remove EOF unless preceeded by backslash
+            # Remove EOF unless preceded by backslash
            # Remove one backslash in front of EOF
            if [ $USE_PYTHON -eq 1 ]; then
                echo -n "$line" | python -c "$PYTHON_EXTRACT_FILTER" >> "$path"
@ -245,7 +260,16 @@ function extract {
        fi
        if [[ $line =~ ^Path:\ (.*)$ ]]; then
            path=${BASH_REMATCH[1]}
-            if [ -e "$path" ] || [ -L "$path" ]; then
+            if [ -L "$path" ]; then
+                rm "$path"
+            elif [ -d "$path" ]; then
+                if [ "${RECURSIVE_UNLINK:-}" == "yes" ]; then
+                    rm -r "$path"
+                else
+                    # Safe because symlinks to directories are dealt with above
+                    rmdir "$path"
+                fi
+            elif [ -e "$path" ]; then
                rm "$path"
            fi
        elif [[ $line =~ ^Lines:\ (.*)$ ]]; then
@ -338,8 +362,8 @@ function _create {
            else
                < "$file" \
                    sed 's/EOF/\\EOF/g;
-                         s/NULLBYTE/\\NULLBYTE/g;
-                         s/\x0/NULLBYTE/g;
+                            s/NULLBYTE/\\NULLBYTE/g;
+                            s/\x0/NULLBYTE/g;
                    '
            fi
            if [[ "$eof_without_newline" -eq 1 ]]; then
--- a/vendor/github.com/prometheus/procfs/xfrm.go
+++ b/vendor/github.com/prometheus/procfs/xfrm.go
@ -97,7 +97,7 @@ func NewXfrmStat() (XfrmStat, error) {

 // NewXfrmStat reads the xfrm_stat statistics from the 'proc' filesystem.
 func (fs FS) NewXfrmStat() (XfrmStat, error) {
-	file, err := os.Open(fs.Path("net/xfrm_stat"))
+	file, err := os.Open(fs.proc.Path("net/xfrm_stat"))
 	if err != nil {
 		return XfrmStat{}, err
 	}
--- a/vendor/github.com/prometheus/procfs/xfs/parse.go
+++ b/vendor/github.com/prometheus/procfs/xfs/parse.go
@ -1,330 +0,0 @@
-// Copyright 2017 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package xfs
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-	"strings"
-
-	"github.com/prometheus/procfs/internal/util"
-)
-
-// ParseStats parses a Stats from an input io.Reader, using the format
-// found in /proc/fs/xfs/stat.
-func ParseStats(r io.Reader) (*Stats, error) {
-	const (
-		// Fields parsed into stats structures.
-		fieldExtentAlloc = "extent_alloc"
-		fieldAbt         = "abt"
-		fieldBlkMap      = "blk_map"
-		fieldBmbt        = "bmbt"
-		fieldDir         = "dir"
-		fieldTrans       = "trans"
-		fieldIg          = "ig"
-		fieldLog         = "log"
-		fieldRw          = "rw"
-		fieldAttr        = "attr"
-		fieldIcluster    = "icluster"
-		fieldVnodes      = "vnodes"
-		fieldBuf         = "buf"
-		fieldXpc         = "xpc"
-
-		// Unimplemented at this time due to lack of documentation.
-		// fieldPushAil = "push_ail"
-		// fieldXstrat  = "xstrat"
-		// fieldAbtb2   = "abtb2"
-		// fieldAbtc2   = "abtc2"
-		// fieldBmbt2   = "bmbt2"
-		// fieldIbt2    = "ibt2"
-		// fieldFibt2   = "fibt2"
-		// fieldQm      = "qm"
-		// fieldDebug   = "debug"
-	)
-
-	var xfss Stats
-
-	s := bufio.NewScanner(r)
-	for s.Scan() {
-		// Expect at least a string label and a single integer value, ex:
-		//   - abt 0
-		//   - rw 1 2
-		ss := strings.Fields(string(s.Bytes()))
-		if len(ss) < 2 {
-			continue
-		}
-		label := ss[0]
-
-		// Extended precision counters are uint64 values.
-		if label == fieldXpc {
-			us, err := util.ParseUint64s(ss[1:])
-			if err != nil {
-				return nil, err
-			}
-
-			xfss.ExtendedPrecision, err = extendedPrecisionStats(us)
-			if err != nil {
-				return nil, err
-			}
-
-			continue
-		}
-
-		// All other counters are uint32 values.
-		us, err := util.ParseUint32s(ss[1:])
-		if err != nil {
-			return nil, err
-		}
-
-		switch label {
-		case fieldExtentAlloc:
-			xfss.ExtentAllocation, err = extentAllocationStats(us)
-		case fieldAbt:
-			xfss.AllocationBTree, err = btreeStats(us)
-		case fieldBlkMap:
-			xfss.BlockMapping, err = blockMappingStats(us)
-		case fieldBmbt:
-			xfss.BlockMapBTree, err = btreeStats(us)
-		case fieldDir:
-			xfss.DirectoryOperation, err = directoryOperationStats(us)
-		case fieldTrans:
-			xfss.Transaction, err = transactionStats(us)
-		case fieldIg:
-			xfss.InodeOperation, err = inodeOperationStats(us)
-		case fieldLog:
-			xfss.LogOperation, err = logOperationStats(us)
-		case fieldRw:
-			xfss.ReadWrite, err = readWriteStats(us)
-		case fieldAttr:
-			xfss.AttributeOperation, err = attributeOperationStats(us)
-		case fieldIcluster:
-			xfss.InodeClustering, err = inodeClusteringStats(us)
-		case fieldVnodes:
-			xfss.Vnode, err = vnodeStats(us)
-		case fieldBuf:
-			xfss.Buffer, err = bufferStats(us)
-		}
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return &xfss, s.Err()
-}
-
-// extentAllocationStats builds an ExtentAllocationStats from a slice of uint32s.
-func extentAllocationStats(us []uint32) (ExtentAllocationStats, error) {
-	if l := len(us); l != 4 {
-		return ExtentAllocationStats{}, fmt.Errorf("incorrect number of values for XFS extent allocation stats: %d", l)
-	}
-
-	return ExtentAllocationStats{
-		ExtentsAllocated: us[0],
-		BlocksAllocated:  us[1],
-		ExtentsFreed:     us[2],
-		BlocksFreed:      us[3],
-	}, nil
-}
-
-// btreeStats builds a BTreeStats from a slice of uint32s.
-func btreeStats(us []uint32) (BTreeStats, error) {
-	if l := len(us); l != 4 {
-		return BTreeStats{}, fmt.Errorf("incorrect number of values for XFS btree stats: %d", l)
-	}
-
-	return BTreeStats{
-		Lookups:         us[0],
-		Compares:        us[1],
-		RecordsInserted: us[2],
-		RecordsDeleted:  us[3],
-	}, nil
-}
-
-// BlockMappingStat builds a BlockMappingStats from a slice of uint32s.
-func blockMappingStats(us []uint32) (BlockMappingStats, error) {
-	if l := len(us); l != 7 {
-		return BlockMappingStats{}, fmt.Errorf("incorrect number of values for XFS block mapping stats: %d", l)
-	}
-
-	return BlockMappingStats{
-		Reads:                us[0],
-		Writes:               us[1],
-		Unmaps:               us[2],
-		ExtentListInsertions: us[3],
-		ExtentListDeletions:  us[4],
-		ExtentListLookups:    us[5],
-		ExtentListCompares:   us[6],
-	}, nil
-}
-
-// DirectoryOperationStats builds a DirectoryOperationStats from a slice of uint32s.
-func directoryOperationStats(us []uint32) (DirectoryOperationStats, error) {
-	if l := len(us); l != 4 {
-		return DirectoryOperationStats{}, fmt.Errorf("incorrect number of values for XFS directory operation stats: %d", l)
-	}
-
-	return DirectoryOperationStats{
-		Lookups:  us[0],
-		Creates:  us[1],
-		Removes:  us[2],
-		Getdents: us[3],
-	}, nil
-}
-
-// TransactionStats builds a TransactionStats from a slice of uint32s.
-func transactionStats(us []uint32) (TransactionStats, error) {
-	if l := len(us); l != 3 {
-		return TransactionStats{}, fmt.Errorf("incorrect number of values for XFS transaction stats: %d", l)
-	}
-
-	return TransactionStats{
-		Sync:  us[0],
-		Async: us[1],
-		Empty: us[2],
-	}, nil
-}
-
-// InodeOperationStats builds an InodeOperationStats from a slice of uint32s.
-func inodeOperationStats(us []uint32) (InodeOperationStats, error) {
-	if l := len(us); l != 7 {
-		return InodeOperationStats{}, fmt.Errorf("incorrect number of values for XFS inode operation stats: %d", l)
-	}
-
-	return InodeOperationStats{
-		Attempts:        us[0],
-		Found:           us[1],
-		Recycle:         us[2],
-		Missed:          us[3],
-		Duplicate:       us[4],
-		Reclaims:        us[5],
-		AttributeChange: us[6],
-	}, nil
-}
-
-// LogOperationStats builds a LogOperationStats from a slice of uint32s.
-func logOperationStats(us []uint32) (LogOperationStats, error) {
-	if l := len(us); l != 5 {
-		return LogOperationStats{}, fmt.Errorf("incorrect number of values for XFS log operation stats: %d", l)
-	}
-
-	return LogOperationStats{
-		Writes:            us[0],
-		Blocks:            us[1],
-		NoInternalBuffers: us[2],
-		Force:             us[3],
-		ForceSleep:        us[4],
-	}, nil
-}
-
-// ReadWriteStats builds a ReadWriteStats from a slice of uint32s.
-func readWriteStats(us []uint32) (ReadWriteStats, error) {
-	if l := len(us); l != 2 {
-		return ReadWriteStats{}, fmt.Errorf("incorrect number of values for XFS read write stats: %d", l)
-	}
-
-	return ReadWriteStats{
-		Read:  us[0],
-		Write: us[1],
-	}, nil
-}
-
-// AttributeOperationStats builds an AttributeOperationStats from a slice of uint32s.
-func attributeOperationStats(us []uint32) (AttributeOperationStats, error) {
-	if l := len(us); l != 4 {
-		return AttributeOperationStats{}, fmt.Errorf("incorrect number of values for XFS attribute operation stats: %d", l)
-	}
-
-	return AttributeOperationStats{
-		Get:    us[0],
-		Set:    us[1],
-		Remove: us[2],
-		List:   us[3],
-	}, nil
-}
-
-// InodeClusteringStats builds an InodeClusteringStats from a slice of uint32s.
-func inodeClusteringStats(us []uint32) (InodeClusteringStats, error) {
-	if l := len(us); l != 3 {
-		return InodeClusteringStats{}, fmt.Errorf("incorrect number of values for XFS inode clustering stats: %d", l)
-	}
-
-	return InodeClusteringStats{
-		Iflush:     us[0],
-		Flush:      us[1],
-		FlushInode: us[2],
-	}, nil
-}
-
-// VnodeStats builds a VnodeStats from a slice of uint32s.
-func vnodeStats(us []uint32) (VnodeStats, error) {
-	// The attribute "Free" appears to not be available on older XFS
-	// stats versions.  Therefore, 7 or 8 elements may appear in
-	// this slice.
-	l := len(us)
-	if l != 7 && l != 8 {
-		return VnodeStats{}, fmt.Errorf("incorrect number of values for XFS vnode stats: %d", l)
-	}
-
-	s := VnodeStats{
-		Active:   us[0],
-		Allocate: us[1],
-		Get:      us[2],
-		Hold:     us[3],
-		Release:  us[4],
-		Reclaim:  us[5],
-		Remove:   us[6],
-	}
-
-	// Skip adding free, unless it is present. The zero value will
-	// be used in place of an actual count.
-	if l == 7 {
-		return s, nil
-	}
-
-	s.Free = us[7]
-	return s, nil
-}
-
-// BufferStats builds a BufferStats from a slice of uint32s.
-func bufferStats(us []uint32) (BufferStats, error) {
-	if l := len(us); l != 9 {
-		return BufferStats{}, fmt.Errorf("incorrect number of values for XFS buffer stats: %d", l)
-	}
-
-	return BufferStats{
-		Get:             us[0],
-		Create:          us[1],
-		GetLocked:       us[2],
-		GetLockedWaited: us[3],
-		BusyLocked:      us[4],
-		MissLocked:      us[5],
-		PageRetries:     us[6],
-		PageFound:       us[7],
-		GetRead:         us[8],
-	}, nil
-}
-
-// ExtendedPrecisionStats builds an ExtendedPrecisionStats from a slice of uint32s.
-func extendedPrecisionStats(us []uint64) (ExtendedPrecisionStats, error) {
-	if l := len(us); l != 3 {
-		return ExtendedPrecisionStats{}, fmt.Errorf("incorrect number of values for XFS extended precision stats: %d", l)
-	}
-
-	return ExtendedPrecisionStats{
-		FlushBytes: us[0],
-		WriteBytes: us[1],
-		ReadBytes:  us[2],
-	}, nil
-}
--- a/vendor/github.com/prometheus/procfs/xfs/xfs.go
+++ b/vendor/github.com/prometheus/procfs/xfs/xfs.go
@ -1,163 +0,0 @@
-// Copyright 2017 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// Package xfs provides access to statistics exposed by the XFS filesystem.
-package xfs
-
-// Stats contains XFS filesystem runtime statistics, parsed from
-// /proc/fs/xfs/stat.
-//
-// The names and meanings of each statistic were taken from
-// http://xfs.org/index.php/Runtime_Stats and xfs_stats.h in the Linux
-// kernel source. Most counters are uint32s (same data types used in
-// xfs_stats.h), but some of the "extended precision stats" are uint64s.
-type Stats struct {
-	// The name of the filesystem used to source these statistics.
-	// If empty, this indicates aggregated statistics for all XFS
-	// filesystems on the host.
-	Name string
-
-	ExtentAllocation   ExtentAllocationStats
-	AllocationBTree    BTreeStats
-	BlockMapping       BlockMappingStats
-	BlockMapBTree      BTreeStats
-	DirectoryOperation DirectoryOperationStats
-	Transaction        TransactionStats
-	InodeOperation     InodeOperationStats
-	LogOperation       LogOperationStats
-	ReadWrite          ReadWriteStats
-	AttributeOperation AttributeOperationStats
-	InodeClustering    InodeClusteringStats
-	Vnode              VnodeStats
-	Buffer             BufferStats
-	ExtendedPrecision  ExtendedPrecisionStats
-}
-
-// ExtentAllocationStats contains statistics regarding XFS extent allocations.
-type ExtentAllocationStats struct {
-	ExtentsAllocated uint32
-	BlocksAllocated  uint32
-	ExtentsFreed     uint32
-	BlocksFreed      uint32
-}
-
-// BTreeStats contains statistics regarding an XFS internal B-tree.
-type BTreeStats struct {
-	Lookups         uint32
-	Compares        uint32
-	RecordsInserted uint32
-	RecordsDeleted  uint32
-}
-
-// BlockMappingStats contains statistics regarding XFS block maps.
-type BlockMappingStats struct {
-	Reads                uint32
-	Writes               uint32
-	Unmaps               uint32
-	ExtentListInsertions uint32
-	ExtentListDeletions  uint32
-	ExtentListLookups    uint32
-	ExtentListCompares   uint32
-}
-
-// DirectoryOperationStats contains statistics regarding XFS directory entries.
-type DirectoryOperationStats struct {
-	Lookups  uint32
-	Creates  uint32
-	Removes  uint32
-	Getdents uint32
-}
-
-// TransactionStats contains statistics regarding XFS metadata transactions.
-type TransactionStats struct {
-	Sync  uint32
-	Async uint32
-	Empty uint32
-}
-
-// InodeOperationStats contains statistics regarding XFS inode operations.
-type InodeOperationStats struct {
-	Attempts        uint32
-	Found           uint32
-	Recycle         uint32
-	Missed          uint32
-	Duplicate       uint32
-	Reclaims        uint32
-	AttributeChange uint32
-}
-
-// LogOperationStats contains statistics regarding the XFS log buffer.
-type LogOperationStats struct {
-	Writes            uint32
-	Blocks            uint32
-	NoInternalBuffers uint32
-	Force             uint32
-	ForceSleep        uint32
-}
-
-// ReadWriteStats contains statistics regarding the number of read and write
-// system calls for XFS filesystems.
-type ReadWriteStats struct {
-	Read  uint32
-	Write uint32
-}
-
-// AttributeOperationStats contains statistics regarding manipulation of
-// XFS extended file attributes.
-type AttributeOperationStats struct {
-	Get    uint32
-	Set    uint32
-	Remove uint32
-	List   uint32
-}
-
-// InodeClusteringStats contains statistics regarding XFS inode clustering
-// operations.
-type InodeClusteringStats struct {
-	Iflush     uint32
-	Flush      uint32
-	FlushInode uint32
-}
-
-// VnodeStats contains statistics regarding XFS vnode operations.
-type VnodeStats struct {
-	Active   uint32
-	Allocate uint32
-	Get      uint32
-	Hold     uint32
-	Release  uint32
-	Reclaim  uint32
-	Remove   uint32
-	Free     uint32
-}
-
-// BufferStats contains statistics regarding XFS read/write I/O buffers.
-type BufferStats struct {
-	Get             uint32
-	Create          uint32
-	GetLocked       uint32
-	GetLockedWaited uint32
-	BusyLocked      uint32
-	MissLocked      uint32
-	PageRetries     uint32
-	PageFound       uint32
-	GetRead         uint32
-}
-
-// ExtendedPrecisionStats contains high precision counters used to track the
-// total number of bytes read, written, or flushed, during XFS operations.
-type ExtendedPrecisionStats struct {
-	FlushBytes uint64
-	WriteBytes uint64
-	ReadBytes  uint64
-}
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@ -22,7 +22,7 @@ github.com/alecthomas/template/parse
 github.com/asaskevich/govalidator
 # github.com/beevik/etree v1.1.0
 github.com/beevik/etree
-# github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973
+# github.com/beorn7/perks v1.0.0
 github.com/beorn7/perks/quantile
 # github.com/c2h5oh/datasize v0.0.0-20200112174442-28bbd4740fee
 github.com/c2h5oh/datasize
@ -138,22 +138,20 @@ github.com/pelletier/go-toml
 github.com/pkg/errors
 # github.com/pmezard/go-difflib v1.0.0
 github.com/pmezard/go-difflib/difflib
-# github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829
+# github.com/prometheus/client_golang v0.9.4
 github.com/prometheus/client_golang/prometheus
 github.com/prometheus/client_golang/prometheus/internal
 github.com/prometheus/client_golang/prometheus/promauto
 github.com/prometheus/client_golang/prometheus/promhttp
-# github.com/prometheus/client_model v0.0.0-20190115171406-56726106282f
+# github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90
 github.com/prometheus/client_model/go
-# github.com/prometheus/common v0.2.0
+# github.com/prometheus/common v0.4.1
 github.com/prometheus/common/expfmt
 github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg
 github.com/prometheus/common/model
-# github.com/prometheus/procfs v0.0.0-20190117184657-bf6a532e95b1
+# github.com/prometheus/procfs v0.0.2
 github.com/prometheus/procfs
-github.com/prometheus/procfs/internal/util
-github.com/prometheus/procfs/nfs
-github.com/prometheus/procfs/xfs
+github.com/prometheus/procfs/internal/fs
 # github.com/russross/blackfriday/v2 v2.0.1
 github.com/russross/blackfriday/v2
 # github.com/samedi/caldav-go v3.0.0+incompatible => github.com/kolaente/caldav-go v3.0.1-0.20190524174923-9e5cd1688227+incompatible