vendor: github.com/prometheus/procfs v0.7.3

un-pinning the dependency to let go modules resolve the version to use.

full diff: https://github.com/prometheus/procfs/compare/v0.0.11...v0.7.3

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor.mod

@@ -50,5 +50,4 @@ replace (
 	github.com/docker/docker => github.com/docker/docker v20.10.3-0.20220309172631-83b51522df43+incompatible // master (v21.xx-dev)
 	github.com/gogo/googleapis => github.com/gogo/googleapis v1.3.2
 	github.com/prometheus/client_golang => github.com/prometheus/client_golang v1.6.0
-	github.com/prometheus/procfs => github.com/prometheus/procfs v0.0.11
 )

vendor.sum

@@ -780,8 +780,15 @@ github.com/prometheus/common v0.10.0/go.mod h1:Tlit/dnDKsSWFlCLTWaA1cyBgKHSMdTB8
 github.com/prometheus/common v0.26.0/go.mod h1:M7rCNAaPfAosfx8veZJCuw84e35h3Cfd9VFqTh1DIvc=
 github.com/prometheus/common v0.30.0 h1:JEkYlQnpzrzQFxi6gnukFPdQ+ac82oRhzMcIduJu/Ug=
 github.com/prometheus/common v0.30.0/go.mod h1:vu+V0TpY+O6vW9J44gczi3Ap/oXXR10b+M/gUGO4Hls=
-github.com/prometheus/procfs v0.0.11 h1:DhHlBtkHWPYi8O2y31JkK0TF+DGM+51OopZjH/Ia5qI=
+github.com/prometheus/procfs v0.0.0-20180125133057-cb4147076ac7/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
+github.com/prometheus/procfs v0.0.0-20190522114515-bc1a522cf7b1/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
+github.com/prometheus/procfs v0.0.5/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDaekg4FpcdQ=
+github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+GxbHq6oeK9A=
 github.com/prometheus/procfs v0.0.11/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
+github.com/prometheus/procfs v0.2.0/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
+github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
+github.com/prometheus/procfs v0.7.3 h1:4jVXhlkAyzOScmCkXBTOLRLTz8EeU+eyjrwB/EPq0VU=
+github.com/prometheus/procfs v0.7.3/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=

vendor/github.com/prometheus/procfs/CODE_OF_CONDUCT.md

@@ -0,0 +1,3 @@
+## Prometheus Community Code of Conduct
+
+Prometheus follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).

vendor/github.com/prometheus/procfs/Makefile

@@ -18,6 +18,8 @@ include Makefile.common
 	./ttar -C $(dir $*) -x -f $*.ttar
 	touch $@
 
+fixtures: fixtures/.unpacked
+
 update_fixtures:
 	rm -vf fixtures/.unpacked
 	./ttar -c -f fixtures.ttar fixtures/

vendor/github.com/prometheus/procfs/Makefile.common

@@ -78,12 +78,12 @@ ifneq ($(shell which gotestsum),)
 endif
 endif
 
-PROMU_VERSION ?= 0.5.0
+PROMU_VERSION ?= 0.12.0
 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 ?= v1.18.0
+GOLANGCI_LINT_VERSION ?= v1.39.0
 # 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))
@@ -118,7 +118,7 @@ endif
 %: common-% ;
 
 .PHONY: common-all
-common-all: precheck style check_license lint unused build test
+common-all: precheck style check_license lint yamllint unused build test
 
 .PHONY: common-style
 common-style:
@@ -150,6 +150,17 @@ else
 	$(GO) get $(GOOPTS) -t ./...
 endif
 
+.PHONY: update-go-deps
+update-go-deps:
+	@echo ">> updating Go dependencies"
+	@for m in $$($(GO) list -mod=readonly -m -f '{{ if and (not .Indirect) (not .Main)}}{{.Path}}{{end}}' all); do \
+		$(GO) get $$m; \
+	done
+	GO111MODULE=$(GO111MODULE) $(GO) mod tidy
+ifneq (,$(wildcard vendor))
+	GO111MODULE=$(GO111MODULE) $(GO) mod vendor
+endif
+
 .PHONY: common-test-short
 common-test-short: $(GOTEST_DIR)
 	@echo ">> running short tests"
@@ -187,6 +198,15 @@ else
 endif
 endif
 
+.PHONY: common-yamllint
+common-yamllint:
+	@echo ">> running yamllint on all YAML files in the repository"
+ifeq (, $(shell which yamllint))
+	@echo "yamllint not installed so skipping"
+else
+	yamllint .
+endif
+
 # For backward-compatibility.
 .PHONY: common-staticcheck
 common-staticcheck: lint
@@ -234,10 +254,12 @@ common-docker-publish: $(PUBLISH_DOCKER_ARCHS)
 $(PUBLISH_DOCKER_ARCHS): common-docker-publish-%:
 	docker push "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:$(DOCKER_IMAGE_TAG)"
 
+DOCKER_MAJOR_VERSION_TAG = $(firstword $(subst ., ,$(shell cat VERSION)))
 .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"
+	docker tag "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:$(DOCKER_IMAGE_TAG)" "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:v$(DOCKER_MAJOR_VERSION_TAG)"
 
 .PHONY: common-docker-manifest
 common-docker-manifest:

vendor/github.com/prometheus/procfs/README.md

@@ -6,8 +6,8 @@ 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.
 
-[![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 Reference](https://pkg.go.dev/badge/github.com/prometheus/procfs.svg)](https://pkg.go.dev/github.com/prometheus/procfs)
+[![CircleCI](https://circleci.com/gh/prometheus/procfs/tree/master.svg?style=svg)](https://circleci.com/gh/prometheus/procfs/tree/master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/prometheus/procfs)](https://goreportcard.com/report/github.com/prometheus/procfs)
 
 ## Usage

vendor/github.com/prometheus/procfs/SECURITY.md

@@ -0,0 +1,6 @@
+# Reporting a security issue
+
+The Prometheus security policy, including how to report vulnerabilities, can be
+found here:
+
+https://prometheus.io/docs/operating/security/

vendor/github.com/prometheus/procfs/arp.go

@@ -36,7 +36,7 @@ type ARPEntry struct {
 func (fs FS) GatherARPEntries() ([]ARPEntry, error) {
 	data, err := ioutil.ReadFile(fs.proc.Path("net/arp"))
 	if err != nil {
-		return nil, fmt.Errorf("error reading arp %s: %s", fs.proc.Path("net/arp"), err)
+		return nil, fmt.Errorf("error reading arp %q: %w", fs.proc.Path("net/arp"), err)
 	}
 
 	return parseARPEntries(data)
@@ -59,7 +59,7 @@ func parseARPEntries(data []byte) ([]ARPEntry, error) {
 		} else if width == expectedDataWidth {
 			entry, err := parseARPEntry(columns)
 			if err != nil {
-				return []ARPEntry{}, fmt.Errorf("failed to parse ARP entry: %s", err)
+				return []ARPEntry{}, fmt.Errorf("failed to parse ARP entry: %w", err)
 			}
 			entries = append(entries, entry)
 		} else {

vendor/github.com/prometheus/procfs/buddyinfo.go

@@ -74,7 +74,7 @@ func parseBuddyInfo(r io.Reader) ([]BuddyInfo, error) {
 		for i := 0; i < arraySize; i++ {
 			sizes[i], err = strconv.ParseFloat(parts[i+4], 64)
 			if err != nil {
-				return nil, fmt.Errorf("invalid value in buddyinfo: %s", err)
+				return nil, fmt.Errorf("invalid value in buddyinfo: %w", err)
 			}
 		}
 

vendor/github.com/prometheus/procfs/cmdline.go

@@ -0,0 +1,30 @@
+// Copyright 2021 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 (
+	"strings"
+
+	"github.com/prometheus/procfs/internal/util"
+)
+
+// CmdLine returns the command line of the kernel.
+func (fs FS) CmdLine() ([]string, error) {
+	data, err := util.ReadFileNoStat(fs.proc.Path("cmdline"))
+	if err != nil {
+		return nil, err
+	}
+
+	return strings.Fields(string(data)), nil
+}

vendor/github.com/prometheus/procfs/cpuinfo.go

@@ -11,11 +11,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// +build linux
+
 package procfs
 
 import (
 	"bufio"
 	"bytes"
+	"errors"
+	"fmt"
+	"regexp"
 	"strconv"
 	"strings"
 
@@ -52,6 +57,11 @@ type CPUInfo struct {
 	PowerManagement string
 }
 
+var (
+	cpuinfoClockRegexp          = regexp.MustCompile(`([\d.]+)`)
+	cpuinfoS390XProcessorRegexp = regexp.MustCompile(`^processor\s+(\d+):.*`)
+)
+
 // CPUInfo returns information about current system CPUs.
 // See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
 func (fs FS) CPUInfo() ([]CPUInfo, error) {
@@ -62,14 +72,26 @@ func (fs FS) CPUInfo() ([]CPUInfo, error) {
 	return parseCPUInfo(data)
 }
 
-// parseCPUInfo parses data from /proc/cpuinfo
-func parseCPUInfo(info []byte) ([]CPUInfo, error) {
-	cpuinfo := []CPUInfo{}
-	i := -1
+func parseCPUInfoX86(info []byte) ([]CPUInfo, error) {
 	scanner := bufio.NewScanner(bytes.NewReader(info))
+
+	// find the first "processor" line
+	firstLine := firstNonEmptyLine(scanner)
+	if !strings.HasPrefix(firstLine, "processor") || !strings.Contains(firstLine, ":") {
+		return nil, fmt.Errorf("invalid cpuinfo file: %q", firstLine)
+	}
+	field := strings.SplitN(firstLine, ": ", 2)
+	v, err := strconv.ParseUint(field[1], 0, 32)
+	if err != nil {
+		return nil, err
+	}
+	firstcpu := CPUInfo{Processor: uint(v)}
+	cpuinfo := []CPUInfo{firstcpu}
+	i := 0
+
 	for scanner.Scan() {
 		line := scanner.Text()
-		if strings.TrimSpace(line) == "" {
+		if !strings.Contains(line, ":") {
 			continue
 		}
 		field := strings.SplitN(line, ": ", 2)
@@ -82,7 +104,7 @@ func parseCPUInfo(info []byte) ([]CPUInfo, error) {
 				return nil, err
 			}
 			cpuinfo[i].Processor = uint(v)
-		case "vendor_id":
+		case "vendor", "vendor_id":
 			cpuinfo[i].VendorID = field[1]
 		case "cpu family":
 			cpuinfo[i].CPUFamily = field[1]
@@ -163,5 +185,297 @@ func parseCPUInfo(info []byte) ([]CPUInfo, error) {
 		}
 	}
 	return cpuinfo, nil
+}
+
+func parseCPUInfoARM(info []byte) ([]CPUInfo, error) {
+	scanner := bufio.NewScanner(bytes.NewReader(info))
+
+	firstLine := firstNonEmptyLine(scanner)
+	match, _ := regexp.MatchString("^[Pp]rocessor", firstLine)
+	if !match || !strings.Contains(firstLine, ":") {
+		return nil, fmt.Errorf("invalid cpuinfo file: %q", firstLine)
+	}
+	field := strings.SplitN(firstLine, ": ", 2)
+	cpuinfo := []CPUInfo{}
+	featuresLine := ""
+	commonCPUInfo := CPUInfo{}
+	i := 0
+	if strings.TrimSpace(field[0]) == "Processor" {
+		commonCPUInfo = CPUInfo{ModelName: field[1]}
+		i = -1
+	} else {
+		v, err := strconv.ParseUint(field[1], 0, 32)
+		if err != nil {
+			return nil, err
+		}
+		firstcpu := CPUInfo{Processor: uint(v)}
+		cpuinfo = []CPUInfo{firstcpu}
+	}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if !strings.Contains(line, ":") {
+			continue
+		}
+		field := strings.SplitN(line, ": ", 2)
+		switch strings.TrimSpace(field[0]) {
+		case "processor":
+			cpuinfo = append(cpuinfo, commonCPUInfo) // start of the next processor
+			i++
+			v, err := strconv.ParseUint(field[1], 0, 32)
+			if err != nil {
+				return nil, err
+			}
+			cpuinfo[i].Processor = uint(v)
+		case "BogoMIPS":
+			if i == -1 {
+				cpuinfo = append(cpuinfo, commonCPUInfo) // There is only one processor
+				i++
+				cpuinfo[i].Processor = 0
+			}
+			v, err := strconv.ParseFloat(field[1], 64)
+			if err != nil {
+				return nil, err
+			}
+			cpuinfo[i].BogoMips = v
+		case "Features":
+			featuresLine = line
+		case "model name":
+			cpuinfo[i].ModelName = field[1]
+		}
+	}
+	fields := strings.SplitN(featuresLine, ": ", 2)
+	for i := range cpuinfo {
+		cpuinfo[i].Flags = strings.Fields(fields[1])
+	}
+	return cpuinfo, nil
 
 }
+
+func parseCPUInfoS390X(info []byte) ([]CPUInfo, error) {
+	scanner := bufio.NewScanner(bytes.NewReader(info))
+
+	firstLine := firstNonEmptyLine(scanner)
+	if !strings.HasPrefix(firstLine, "vendor_id") || !strings.Contains(firstLine, ":") {
+		return nil, fmt.Errorf("invalid cpuinfo file: %q", firstLine)
+	}
+	field := strings.SplitN(firstLine, ": ", 2)
+	cpuinfo := []CPUInfo{}
+	commonCPUInfo := CPUInfo{VendorID: field[1]}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if !strings.Contains(line, ":") {
+			continue
+		}
+		field := strings.SplitN(line, ": ", 2)
+		switch strings.TrimSpace(field[0]) {
+		case "bogomips per cpu":
+			v, err := strconv.ParseFloat(field[1], 64)
+			if err != nil {
+				return nil, err
+			}
+			commonCPUInfo.BogoMips = v
+		case "features":
+			commonCPUInfo.Flags = strings.Fields(field[1])
+		}
+		if strings.HasPrefix(line, "processor") {
+			match := cpuinfoS390XProcessorRegexp.FindStringSubmatch(line)
+			if len(match) < 2 {
+				return nil, fmt.Errorf("invalid cpuinfo file: %q", firstLine)
+			}
+			cpu := commonCPUInfo
+			v, err := strconv.ParseUint(match[1], 0, 32)
+			if err != nil {
+				return nil, err
+			}
+			cpu.Processor = uint(v)
+			cpuinfo = append(cpuinfo, cpu)
+		}
+		if strings.HasPrefix(line, "cpu number") {
+			break
+		}
+	}
+
+	i := 0
+	for scanner.Scan() {
+		line := scanner.Text()
+		if !strings.Contains(line, ":") {
+			continue
+		}
+		field := strings.SplitN(line, ": ", 2)
+		switch strings.TrimSpace(field[0]) {
+		case "cpu number":
+			i++
+		case "cpu MHz dynamic":
+			clock := cpuinfoClockRegexp.FindString(strings.TrimSpace(field[1]))
+			v, err := strconv.ParseFloat(clock, 64)
+			if err != nil {
+				return nil, err
+			}
+			cpuinfo[i].CPUMHz = v
+		case "physical id":
+			cpuinfo[i].PhysicalID = field[1]
+		case "core id":
+			cpuinfo[i].CoreID = field[1]
+		case "cpu cores":
+			v, err := strconv.ParseUint(field[1], 0, 32)
+			if err != nil {
+				return nil, err
+			}
+			cpuinfo[i].CPUCores = uint(v)
+		case "siblings":
+			v, err := strconv.ParseUint(field[1], 0, 32)
+			if err != nil {
+				return nil, err
+			}
+			cpuinfo[i].Siblings = uint(v)
+		}
+	}
+
+	return cpuinfo, nil
+}
+
+func parseCPUInfoMips(info []byte) ([]CPUInfo, error) {
+	scanner := bufio.NewScanner(bytes.NewReader(info))
+
+	// find the first "processor" line
+	firstLine := firstNonEmptyLine(scanner)
+	if !strings.HasPrefix(firstLine, "system type") || !strings.Contains(firstLine, ":") {
+		return nil, fmt.Errorf("invalid cpuinfo file: %q", firstLine)
+	}
+	field := strings.SplitN(firstLine, ": ", 2)
+	cpuinfo := []CPUInfo{}
+	systemType := field[1]
+
+	i := 0
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if !strings.Contains(line, ":") {
+			continue
+		}
+		field := strings.SplitN(line, ": ", 2)
+		switch strings.TrimSpace(field[0]) {
+		case "processor":
+			v, err := strconv.ParseUint(field[1], 0, 32)
+			if err != nil {
+				return nil, err
+			}
+			i = int(v)
+			cpuinfo = append(cpuinfo, CPUInfo{}) // start of the next processor
+			cpuinfo[i].Processor = uint(v)
+			cpuinfo[i].VendorID = systemType
+		case "cpu model":
+			cpuinfo[i].ModelName = field[1]
+		case "BogoMIPS":
+			v, err := strconv.ParseFloat(field[1], 64)
+			if err != nil {
+				return nil, err
+			}
+			cpuinfo[i].BogoMips = v
+		}
+	}
+	return cpuinfo, nil
+}
+
+func parseCPUInfoPPC(info []byte) ([]CPUInfo, error) {
+	scanner := bufio.NewScanner(bytes.NewReader(info))
+
+	firstLine := firstNonEmptyLine(scanner)
+	if !strings.HasPrefix(firstLine, "processor") || !strings.Contains(firstLine, ":") {
+		return nil, fmt.Errorf("invalid cpuinfo file: %q", firstLine)
+	}
+	field := strings.SplitN(firstLine, ": ", 2)
+	v, err := strconv.ParseUint(field[1], 0, 32)
+	if err != nil {
+		return nil, err
+	}
+	firstcpu := CPUInfo{Processor: uint(v)}
+	cpuinfo := []CPUInfo{firstcpu}
+	i := 0
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if !strings.Contains(line, ":") {
+			continue
+		}
+		field := strings.SplitN(line, ": ", 2)
+		switch strings.TrimSpace(field[0]) {
+		case "processor":
+			cpuinfo = append(cpuinfo, CPUInfo{}) // start of the next processor
+			i++
+			v, err := strconv.ParseUint(field[1], 0, 32)
+			if err != nil {
+				return nil, err
+			}
+			cpuinfo[i].Processor = uint(v)
+		case "cpu":
+			cpuinfo[i].VendorID = field[1]
+		case "clock":
+			clock := cpuinfoClockRegexp.FindString(strings.TrimSpace(field[1]))
+			v, err := strconv.ParseFloat(clock, 64)
+			if err != nil {
+				return nil, err
+			}
+			cpuinfo[i].CPUMHz = v
+		}
+	}
+	return cpuinfo, nil
+}
+
+func parseCPUInfoRISCV(info []byte) ([]CPUInfo, error) {
+	scanner := bufio.NewScanner(bytes.NewReader(info))
+
+	firstLine := firstNonEmptyLine(scanner)
+	if !strings.HasPrefix(firstLine, "processor") || !strings.Contains(firstLine, ":") {
+		return nil, fmt.Errorf("invalid cpuinfo file: %q", firstLine)
+	}
+	field := strings.SplitN(firstLine, ": ", 2)
+	v, err := strconv.ParseUint(field[1], 0, 32)
+	if err != nil {
+		return nil, err
+	}
+	firstcpu := CPUInfo{Processor: uint(v)}
+	cpuinfo := []CPUInfo{firstcpu}
+	i := 0
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if !strings.Contains(line, ":") {
+			continue
+		}
+		field := strings.SplitN(line, ": ", 2)
+		switch strings.TrimSpace(field[0]) {
+		case "processor":
+			v, err := strconv.ParseUint(field[1], 0, 32)
+			if err != nil {
+				return nil, err
+			}
+			i = int(v)
+			cpuinfo = append(cpuinfo, CPUInfo{}) // start of the next processor
+			cpuinfo[i].Processor = uint(v)
+		case "hart":
+			cpuinfo[i].CoreID = field[1]
+		case "isa":
+			cpuinfo[i].ModelName = field[1]
+		}
+	}
+	return cpuinfo, nil
+}
+
+func parseCPUInfoDummy(_ []byte) ([]CPUInfo, error) { // nolint:unused,deadcode
+	return nil, errors.New("not implemented")
+}
+
+// firstNonEmptyLine advances the scanner to the first non-empty line
+// and returns the contents of that line
+func firstNonEmptyLine(scanner *bufio.Scanner) string {
+	for scanner.Scan() {
+		line := scanner.Text()
+		if strings.TrimSpace(line) != "" {
+			return line
+		}
+	}
+	return ""
+}

vendor/github.com/prometheus/procfs/cpuinfo_armx.go

@@ -0,0 +1,19 @@
+// Copyright 2020 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 linux
+// +build arm arm64
+
+package procfs
+
+var parseCPUInfo = parseCPUInfoARM

vendor/github.com/prometheus/procfs/cpuinfo_mipsx.go

@@ -0,0 +1,19 @@
+// Copyright 2020 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 linux
+// +build mips mipsle mips64 mips64le
+
+package procfs
+
+var parseCPUInfo = parseCPUInfoMips

vendor/github.com/prometheus/procfs/cpuinfo_others.go

@@ -0,0 +1,19 @@
+// Copyright 2020 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 linux
+// +build !386,!amd64,!arm,!arm64,!mips,!mips64,!mips64le,!mipsle,!ppc64,!ppc64le,!riscv64,!s390x
+
+package procfs
+
+var parseCPUInfo = parseCPUInfoDummy

vendor/github.com/prometheus/procfs/cpuinfo_ppcx.go

@@ -0,0 +1,19 @@
+// Copyright 2020 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 linux
+// +build ppc64 ppc64le
+
+package procfs
+
+var parseCPUInfo = parseCPUInfoPPC

vendor/github.com/prometheus/procfs/cpuinfo_riscvx.go

@@ -0,0 +1,19 @@
+// Copyright 2020 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 linux
+// +build riscv riscv64
+
+package procfs
+
+var parseCPUInfo = parseCPUInfoRISCV

vendor/github.com/prometheus/procfs/cpuinfo_s390x.go

@@ -0,0 +1,18 @@
+// Copyright 2020 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 linux
+
+package procfs
+
+var parseCPUInfo = parseCPUInfoS390X

vendor/github.com/prometheus/procfs/cpuinfo_x86.go

@@ -0,0 +1,19 @@
+// Copyright 2020 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 linux
+// +build 386 amd64
+
+package procfs
+
+var parseCPUInfo = parseCPUInfoX86

vendor/github.com/prometheus/procfs/crypto.go

@@ -55,12 +55,12 @@ func (fs FS) Crypto() ([]Crypto, error) {
 	path := fs.proc.Path("crypto")
 	b, err := util.ReadFileNoStat(path)
 	if err != nil {
-		return nil, fmt.Errorf("error reading crypto %s: %s", path, err)
+		return nil, fmt.Errorf("error reading crypto %q: %w", path, err)
 	}
 
 	crypto, err := parseCrypto(bytes.NewReader(b))
 	if err != nil {
-		return nil, fmt.Errorf("error parsing crypto %s: %s", path, err)
+		return nil, fmt.Errorf("error parsing crypto %q: %w", path, err)
 	}
 
 	return crypto, nil

vendor/github.com/prometheus/procfs/doc.go

@@ -31,7 +31,7 @@
 //    		log.Fatalf("could not get process: %s", err)
 //    	}
 //
-//    	stat, err := p.NewStat()
+//    	stat, err := p.Stat()
 //    	if err != nil {
 //    		log.Fatalf("could not get process stat: %s", err)
 //    	}

vendor/github.com/prometheus/procfs/fscache.go

@@ -0,0 +1,422 @@
+// 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
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/procfs/internal/util"
+)
+
+// Fscacheinfo represents fscache statistics.
+type Fscacheinfo struct {
+	// Number of index cookies allocated
+	IndexCookiesAllocated uint64
+	// data storage cookies allocated
+	DataStorageCookiesAllocated uint64
+	// Number of special cookies allocated
+	SpecialCookiesAllocated uint64
+	// Number of objects allocated
+	ObjectsAllocated uint64
+	// Number of object allocation failures
+	ObjectAllocationsFailure uint64
+	// Number of objects that reached the available state
+	ObjectsAvailable uint64
+	// Number of objects that reached the dead state
+	ObjectsDead uint64
+	// Number of objects that didn't have a coherency check
+	ObjectsWithoutCoherencyCheck uint64
+	// Number of objects that passed a coherency check
+	ObjectsWithCoherencyCheck uint64
+	// Number of objects that needed a coherency data update
+	ObjectsNeedCoherencyCheckUpdate uint64
+	// Number of objects that were declared obsolete
+	ObjectsDeclaredObsolete uint64
+	// Number of pages marked as being cached
+	PagesMarkedAsBeingCached uint64
+	// Number of uncache page requests seen
+	UncachePagesRequestSeen uint64
+	// Number of acquire cookie requests seen
+	AcquireCookiesRequestSeen uint64
+	// Number of acq reqs given a NULL parent
+	AcquireRequestsWithNullParent uint64
+	// Number of acq reqs rejected due to no cache available
+	AcquireRequestsRejectedNoCacheAvailable uint64
+	// Number of acq reqs succeeded
+	AcquireRequestsSucceeded uint64
+	// Number of acq reqs rejected due to error
+	AcquireRequestsRejectedDueToError uint64
+	// Number of acq reqs failed on ENOMEM
+	AcquireRequestsFailedDueToEnomem uint64
+	// Number of lookup calls made on cache backends
+	LookupsNumber uint64
+	// Number of negative lookups made
+	LookupsNegative uint64
+	// Number of positive lookups made
+	LookupsPositive uint64
+	// Number of objects created by lookup
+	ObjectsCreatedByLookup uint64
+	// Number of lookups timed out and requeued
+	LookupsTimedOutAndRequed uint64
+	InvalidationsNumber      uint64
+	InvalidationsRunning     uint64
+	// Number of update cookie requests seen
+	UpdateCookieRequestSeen uint64
+	// Number of upd reqs given a NULL parent
+	UpdateRequestsWithNullParent uint64
+	// Number of upd reqs granted CPU time
+	UpdateRequestsRunning uint64
+	// Number of relinquish cookie requests seen
+	RelinquishCookiesRequestSeen uint64
+	// Number of rlq reqs given a NULL parent
+	RelinquishCookiesWithNullParent uint64
+	// Number of rlq reqs waited on completion of creation
+	RelinquishRequestsWaitingCompleteCreation uint64
+	// Relinqs rtr
+	RelinquishRetries uint64
+	// Number of attribute changed requests seen
+	AttributeChangedRequestsSeen uint64
+	// Number of attr changed requests queued
+	AttributeChangedRequestsQueued uint64
+	// Number of attr changed rejected -ENOBUFS
+	AttributeChangedRejectDueToEnobufs uint64
+	// Number of attr changed failed -ENOMEM
+	AttributeChangedFailedDueToEnomem uint64
+	// Number of attr changed ops given CPU time
+	AttributeChangedOps uint64
+	// Number of allocation requests seen
+	AllocationRequestsSeen uint64
+	// Number of successful alloc reqs
+	AllocationOkRequests uint64
+	// Number of alloc reqs that waited on lookup completion
+	AllocationWaitingOnLookup uint64
+	// Number of alloc reqs rejected -ENOBUFS
+	AllocationsRejectedDueToEnobufs uint64
+	// Number of alloc reqs aborted -ERESTARTSYS
+	AllocationsAbortedDueToErestartsys uint64
+	// Number of alloc reqs submitted
+	AllocationOperationsSubmitted uint64
+	// Number of alloc reqs waited for CPU time
+	AllocationsWaitedForCPU uint64
+	// Number of alloc reqs aborted due to object death
+	AllocationsAbortedDueToObjectDeath uint64
+	// Number of retrieval (read) requests seen
+	RetrievalsReadRequests uint64
+	// Number of successful retr reqs
+	RetrievalsOk uint64
+	// Number of retr reqs that waited on lookup completion
+	RetrievalsWaitingLookupCompletion uint64
+	// Number of retr reqs returned -ENODATA
+	RetrievalsReturnedEnodata uint64
+	// Number of retr reqs rejected -ENOBUFS
+	RetrievalsRejectedDueToEnobufs uint64
+	// Number of retr reqs aborted -ERESTARTSYS
+	RetrievalsAbortedDueToErestartsys uint64
+	// Number of retr reqs failed -ENOMEM
+	RetrievalsFailedDueToEnomem uint64
+	// Number of retr reqs submitted
+	RetrievalsRequests uint64
+	// Number of retr reqs waited for CPU time
+	RetrievalsWaitingCPU uint64
+	// Number of retr reqs aborted due to object death
+	RetrievalsAbortedDueToObjectDeath uint64
+	// Number of storage (write) requests seen
+	StoreWriteRequests uint64
+	// Number of successful store reqs
+	StoreSuccessfulRequests uint64
+	// Number of store reqs on a page already pending storage
+	StoreRequestsOnPendingStorage uint64
+	// Number of store reqs rejected -ENOBUFS
+	StoreRequestsRejectedDueToEnobufs uint64
+	// Number of store reqs failed -ENOMEM
+	StoreRequestsFailedDueToEnomem uint64
+	// Number of store reqs submitted
+	StoreRequestsSubmitted uint64
+	// Number of store reqs granted CPU time
+	StoreRequestsRunning uint64
+	// Number of pages given store req processing time
+	StorePagesWithRequestsProcessing uint64
+	// Number of store reqs deleted from tracking tree
+	StoreRequestsDeleted uint64
+	// Number of store reqs over store limit
+	StoreRequestsOverStoreLimit uint64
+	// Number of release reqs against pages with no pending store
+	ReleaseRequestsAgainstPagesWithNoPendingStorage uint64
+	// Number of release reqs against pages stored by time lock granted
+	ReleaseRequestsAgainstPagesStoredByTimeLockGranted uint64
+	// Number of release reqs ignored due to in-progress store
+	ReleaseRequestsIgnoredDueToInProgressStore uint64
+	// Number of page stores cancelled due to release req
+	PageStoresCancelledByReleaseRequests uint64
+	VmscanWaiting                        uint64
+	// Number of times async ops added to pending queues
+	OpsPending uint64
+	// Number of times async ops given CPU time
+	OpsRunning uint64
+	// Number of times async ops queued for processing
+	OpsEnqueued uint64
+	// Number of async ops cancelled
+	OpsCancelled uint64
+	// Number of async ops rejected due to object lookup/create failure
+	OpsRejected uint64
+	// Number of async ops initialised
+	OpsInitialised uint64
+	// Number of async ops queued for deferred release
+	OpsDeferred uint64
+	// Number of async ops released (should equal ini=N when idle)
+	OpsReleased uint64
+	// Number of deferred-release async ops garbage collected
+	OpsGarbageCollected uint64
+	// Number of in-progress alloc_object() cache ops
+	CacheopAllocationsinProgress uint64
+	// Number of in-progress lookup_object() cache ops
+	CacheopLookupObjectInProgress uint64
+	// Number of in-progress lookup_complete() cache ops
+	CacheopLookupCompleteInPorgress uint64
+	// Number of in-progress grab_object() cache ops
+	CacheopGrabObjectInProgress uint64
+	CacheopInvalidations        uint64
+	// Number of in-progress update_object() cache ops
+	CacheopUpdateObjectInProgress uint64
+	// Number of in-progress drop_object() cache ops
+	CacheopDropObjectInProgress uint64
+	// Number of in-progress put_object() cache ops
+	CacheopPutObjectInProgress uint64
+	// Number of in-progress attr_changed() cache ops
+	CacheopAttributeChangeInProgress uint64
+	// Number of in-progress sync_cache() cache ops
+	CacheopSyncCacheInProgress uint64
+	// Number of in-progress read_or_alloc_page() cache ops
+	CacheopReadOrAllocPageInProgress uint64
+	// Number of in-progress read_or_alloc_pages() cache ops
+	CacheopReadOrAllocPagesInProgress uint64
+	// Number of in-progress allocate_page() cache ops
+	CacheopAllocatePageInProgress uint64
+	// Number of in-progress allocate_pages() cache ops
+	CacheopAllocatePagesInProgress uint64
+	// Number of in-progress write_page() cache ops
+	CacheopWritePagesInProgress uint64
+	// Number of in-progress uncache_page() cache ops
+	CacheopUncachePagesInProgress uint64
+	// Number of in-progress dissociate_pages() cache ops
+	CacheopDissociatePagesInProgress uint64
+	// Number of object lookups/creations rejected due to lack of space
+	CacheevLookupsAndCreationsRejectedLackSpace uint64
+	// Number of stale objects deleted
+	CacheevStaleObjectsDeleted uint64
+	// Number of objects retired when relinquished
+	CacheevRetiredWhenReliquished uint64
+	// Number of objects culled
+	CacheevObjectsCulled uint64
+}
+
+// Fscacheinfo returns information about current fscache statistics.
+// See https://www.kernel.org/doc/Documentation/filesystems/caching/fscache.txt
+func (fs FS) Fscacheinfo() (Fscacheinfo, error) {
+	b, err := util.ReadFileNoStat(fs.proc.Path("fs/fscache/stats"))
+	if err != nil {
+		return Fscacheinfo{}, err
+	}
+
+	m, err := parseFscacheinfo(bytes.NewReader(b))
+	if err != nil {
+		return Fscacheinfo{}, fmt.Errorf("failed to parse Fscacheinfo: %w", err)
+	}
+
+	return *m, nil
+}
+
+func setFSCacheFields(fields []string, setFields ...*uint64) error {
+	var err error
+	if len(fields) < len(setFields) {
+		return fmt.Errorf("Insufficient number of fields, expected %v, got %v", len(setFields), len(fields))
+	}
+
+	for i := range setFields {
+		*setFields[i], err = strconv.ParseUint(strings.Split(fields[i], "=")[1], 0, 64)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func parseFscacheinfo(r io.Reader) (*Fscacheinfo, error) {
+	var m Fscacheinfo
+	s := bufio.NewScanner(r)
+	for s.Scan() {
+		fields := strings.Fields(s.Text())
+		if len(fields) < 2 {
+			return nil, fmt.Errorf("malformed Fscacheinfo line: %q", s.Text())
+		}
+
+		switch fields[0] {
+		case "Cookies:":
+			err := setFSCacheFields(fields[1:], &m.IndexCookiesAllocated, &m.DataStorageCookiesAllocated,
+				&m.SpecialCookiesAllocated)
+			if err != nil {
+				return &m, err
+			}
+		case "Objects:":
+			err := setFSCacheFields(fields[1:], &m.ObjectsAllocated, &m.ObjectAllocationsFailure,
+				&m.ObjectsAvailable, &m.ObjectsDead)
+			if err != nil {
+				return &m, err
+			}
+		case "ChkAux":
+			err := setFSCacheFields(fields[2:], &m.ObjectsWithoutCoherencyCheck, &m.ObjectsWithCoherencyCheck,
+				&m.ObjectsNeedCoherencyCheckUpdate, &m.ObjectsDeclaredObsolete)
+			if err != nil {
+				return &m, err
+			}
+		case "Pages":
+			err := setFSCacheFields(fields[2:], &m.PagesMarkedAsBeingCached, &m.UncachePagesRequestSeen)
+			if err != nil {
+				return &m, err
+			}
+		case "Acquire:":
+			err := setFSCacheFields(fields[1:], &m.AcquireCookiesRequestSeen, &m.AcquireRequestsWithNullParent,
+				&m.AcquireRequestsRejectedNoCacheAvailable, &m.AcquireRequestsSucceeded, &m.AcquireRequestsRejectedDueToError,
+				&m.AcquireRequestsFailedDueToEnomem)
+			if err != nil {
+				return &m, err
+			}
+		case "Lookups:":
+			err := setFSCacheFields(fields[1:], &m.LookupsNumber, &m.LookupsNegative, &m.LookupsPositive,
+				&m.ObjectsCreatedByLookup, &m.LookupsTimedOutAndRequed)
+			if err != nil {
+				return &m, err
+			}
+		case "Invals":
+			err := setFSCacheFields(fields[2:], &m.InvalidationsNumber, &m.InvalidationsRunning)
+			if err != nil {
+				return &m, err
+			}
+		case "Updates:":
+			err := setFSCacheFields(fields[1:], &m.UpdateCookieRequestSeen, &m.UpdateRequestsWithNullParent,
+				&m.UpdateRequestsRunning)
+			if err != nil {
+				return &m, err
+			}
+		case "Relinqs:":
+			err := setFSCacheFields(fields[1:], &m.RelinquishCookiesRequestSeen, &m.RelinquishCookiesWithNullParent,
+				&m.RelinquishRequestsWaitingCompleteCreation, &m.RelinquishRetries)
+			if err != nil {
+				return &m, err
+			}
+		case "AttrChg:":
+			err := setFSCacheFields(fields[1:], &m.AttributeChangedRequestsSeen, &m.AttributeChangedRequestsQueued,
+				&m.AttributeChangedRejectDueToEnobufs, &m.AttributeChangedFailedDueToEnomem, &m.AttributeChangedOps)
+			if err != nil {
+				return &m, err
+			}
+		case "Allocs":
+			if strings.Split(fields[2], "=")[0] == "n" {
+				err := setFSCacheFields(fields[2:], &m.AllocationRequestsSeen, &m.AllocationOkRequests,
+					&m.AllocationWaitingOnLookup, &m.AllocationsRejectedDueToEnobufs, &m.AllocationsAbortedDueToErestartsys)
+				if err != nil {
+					return &m, err
+				}
+			} else {
+				err := setFSCacheFields(fields[2:], &m.AllocationOperationsSubmitted, &m.AllocationsWaitedForCPU,
+					&m.AllocationsAbortedDueToObjectDeath)
+				if err != nil {
+					return &m, err
+				}
+			}
+		case "Retrvls:":
+			if strings.Split(fields[1], "=")[0] == "n" {
+				err := setFSCacheFields(fields[1:], &m.RetrievalsReadRequests, &m.RetrievalsOk, &m.RetrievalsWaitingLookupCompletion,
+					&m.RetrievalsReturnedEnodata, &m.RetrievalsRejectedDueToEnobufs, &m.RetrievalsAbortedDueToErestartsys,
+					&m.RetrievalsFailedDueToEnomem)
+				if err != nil {
+					return &m, err
+				}
+			} else {
+				err := setFSCacheFields(fields[1:], &m.RetrievalsRequests, &m.RetrievalsWaitingCPU, &m.RetrievalsAbortedDueToObjectDeath)
+				if err != nil {
+					return &m, err
+				}
+			}
+		case "Stores":
+			if strings.Split(fields[2], "=")[0] == "n" {
+				err := setFSCacheFields(fields[2:], &m.StoreWriteRequests, &m.StoreSuccessfulRequests,
+					&m.StoreRequestsOnPendingStorage, &m.StoreRequestsRejectedDueToEnobufs, &m.StoreRequestsFailedDueToEnomem)
+				if err != nil {
+					return &m, err
+				}
+			} else {
+				err := setFSCacheFields(fields[2:], &m.StoreRequestsSubmitted, &m.StoreRequestsRunning,
+					&m.StorePagesWithRequestsProcessing, &m.StoreRequestsDeleted, &m.StoreRequestsOverStoreLimit)
+				if err != nil {
+					return &m, err
+				}
+			}
+		case "VmScan":
+			err := setFSCacheFields(fields[2:], &m.ReleaseRequestsAgainstPagesWithNoPendingStorage,
+				&m.ReleaseRequestsAgainstPagesStoredByTimeLockGranted, &m.ReleaseRequestsIgnoredDueToInProgressStore,
+				&m.PageStoresCancelledByReleaseRequests, &m.VmscanWaiting)
+			if err != nil {
+				return &m, err
+			}
+		case "Ops":
+			if strings.Split(fields[2], "=")[0] == "pend" {
+				err := setFSCacheFields(fields[2:], &m.OpsPending, &m.OpsRunning, &m.OpsEnqueued, &m.OpsCancelled, &m.OpsRejected)
+				if err != nil {
+					return &m, err
+				}
+			} else {
+				err := setFSCacheFields(fields[2:], &m.OpsInitialised, &m.OpsDeferred, &m.OpsReleased, &m.OpsGarbageCollected)
+				if err != nil {
+					return &m, err
+				}
+			}
+		case "CacheOp:":
+			if strings.Split(fields[1], "=")[0] == "alo" {
+				err := setFSCacheFields(fields[1:], &m.CacheopAllocationsinProgress, &m.CacheopLookupObjectInProgress,
+					&m.CacheopLookupCompleteInPorgress, &m.CacheopGrabObjectInProgress)
+				if err != nil {
+					return &m, err
+				}
+			} else if strings.Split(fields[1], "=")[0] == "inv" {
+				err := setFSCacheFields(fields[1:], &m.CacheopInvalidations, &m.CacheopUpdateObjectInProgress,
+					&m.CacheopDropObjectInProgress, &m.CacheopPutObjectInProgress, &m.CacheopAttributeChangeInProgress,
+					&m.CacheopSyncCacheInProgress)
+				if err != nil {
+					return &m, err
+				}
+			} else {
+				err := setFSCacheFields(fields[1:], &m.CacheopReadOrAllocPageInProgress, &m.CacheopReadOrAllocPagesInProgress,
+					&m.CacheopAllocatePageInProgress, &m.CacheopAllocatePagesInProgress, &m.CacheopWritePagesInProgress,
+					&m.CacheopUncachePagesInProgress, &m.CacheopDissociatePagesInProgress)
+				if err != nil {
+					return &m, err
+				}
+			}
+		case "CacheEv:":
+			err := setFSCacheFields(fields[1:], &m.CacheevLookupsAndCreationsRejectedLackSpace, &m.CacheevStaleObjectsDeleted,
+				&m.CacheevRetiredWhenReliquished, &m.CacheevObjectsCulled)
+			if err != nil {
+				return &m, err
+			}
+		}
+	}
+
+	return &m, nil
+}

vendor/github.com/prometheus/procfs/go.mod

@@ -1,9 +1,9 @@
 module github.com/prometheus/procfs
 
-go 1.12
+go 1.13
 
 require (
-	github.com/google/go-cmp v0.3.1
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
-	golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e
+	github.com/google/go-cmp v0.5.4
+	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
+	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c
 )

vendor/github.com/prometheus/procfs/go.sum

@@ -1,6 +1,8 @@
-github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
-github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e h1:vcxGaoTs7kV8m5Np9uUNQin4BrLOthgV7252N8V+FwY=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e h1:LwyF2AFISC9nVbS6MgzsaQNSUsRXI49GS+YQ5KX/QH0=
-golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+github.com/google/go-cmp v0.5.4 h1:L8R9j+yAqZuZjsqh/z+F1NCffTKKLShY6zXTItVIZ8M=
+github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+golang.org/x/sync v0.0.0-20201207232520-09787c993a3a h1:DcqTD9SDLc+1P/r1EmRBwnVsrOwW+kk2vWf9n+1sGhs=
+golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c h1:VwygUrnw9jn88c4u8GD3rZQbqrP/tgas88tPUbBxQrk=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

vendor/github.com/prometheus/procfs/internal/fs/fs.go

@@ -39,10 +39,10 @@ type FS string
 func NewFS(mountPoint string) (FS, error) {
 	info, err := os.Stat(mountPoint)
 	if err != nil {
-		return "", fmt.Errorf("could not read %s: %s", mountPoint, err)
+		return "", fmt.Errorf("could not read %q: %w", mountPoint, err)
 	}
 	if !info.IsDir() {
-		return "", fmt.Errorf("mount point %s is not a directory", mountPoint)
+		return "", fmt.Errorf("mount point %q is not a directory", mountPoint)
 	}
 
 	return FS(mountPoint), nil

vendor/github.com/prometheus/procfs/internal/util/parse.go

@@ -73,6 +73,15 @@ func ReadUintFromFile(path string) (uint64, error) {
 	return strconv.ParseUint(strings.TrimSpace(string(data)), 10, 64)
 }
 
+// ReadIntFromFile reads a file and attempts to parse a int64 from it.
+func ReadIntFromFile(path string) (int64, error) {
+	data, err := ioutil.ReadFile(path)
+	if err != nil {
+		return 0, err
+	}
+	return strconv.ParseInt(strings.TrimSpace(string(data)), 10, 64)
+}
+
 // ParseBool parses a string into a boolean pointer.
 func ParseBool(b string) *bool {
 	var truth bool

vendor/github.com/prometheus/procfs/kernel_random.go

@@ -0,0 +1,62 @@
+// Copyright 2020 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 procfs
+
+import (
+	"os"
+
+	"github.com/prometheus/procfs/internal/util"
+)
+
+// KernelRandom contains information about to the kernel's random number generator.
+type KernelRandom struct {
+	// EntropyAvaliable gives the available entropy, in bits.
+	EntropyAvaliable *uint64
+	// PoolSize gives the size of the entropy pool, in bits.
+	PoolSize *uint64
+	// URandomMinReseedSeconds is the number of seconds after which the DRNG will be reseeded.
+	URandomMinReseedSeconds *uint64
+	// WriteWakeupThreshold the number of bits of entropy below which we wake up processes
+	// that do a select(2) or poll(2) for write access to /dev/random.
+	WriteWakeupThreshold *uint64
+	// ReadWakeupThreshold is the number of bits of entropy required for waking up processes that sleep
+	// waiting for entropy from /dev/random.
+	ReadWakeupThreshold *uint64
+}
+
+// KernelRandom returns values from /proc/sys/kernel/random.
+func (fs FS) KernelRandom() (KernelRandom, error) {
+	random := KernelRandom{}
+
+	for file, p := range map[string]**uint64{
+		"entropy_avail":           &random.EntropyAvaliable,
+		"poolsize":                &random.PoolSize,
+		"urandom_min_reseed_secs": &random.URandomMinReseedSeconds,
+		"write_wakeup_threshold":  &random.WriteWakeupThreshold,
+		"read_wakeup_threshold":   &random.ReadWakeupThreshold,
+	} {
+		val, err := util.ReadUintFromFile(fs.proc.Path("sys", "kernel", "random", file))
+		if os.IsNotExist(err) {
+			continue
+		}
+		if err != nil {
+			return random, err
+		}
+		*p = &val
+	}
+
+	return random, nil
+}

vendor/github.com/prometheus/procfs/loadavg.go

@@ -44,14 +44,14 @@ func parseLoad(loadavgBytes []byte) (*LoadAvg, error) {
 	loads := make([]float64, 3)
 	parts := strings.Fields(string(loadavgBytes))
 	if len(parts) < 3 {
-		return nil, fmt.Errorf("malformed loadavg line: too few fields in loadavg string: %s", string(loadavgBytes))
+		return nil, fmt.Errorf("malformed loadavg line: too few fields in loadavg string: %q", string(loadavgBytes))
 	}
 
 	var err error
 	for i, load := range parts[0:3] {
 		loads[i], err = strconv.ParseFloat(load, 64)
 		if err != nil {
-			return nil, fmt.Errorf("could not parse load '%s': %s", load, err)
+			return nil, fmt.Errorf("could not parse load %q: %w", load, err)
 		}
 	}
 	return &LoadAvg{

vendor/github.com/prometheus/procfs/mdstat.go

@@ -22,8 +22,12 @@ import (
 )
 
 var (
-	statusLineRE   = regexp.MustCompile(`(\d+) blocks .*\[(\d+)/(\d+)\] \[[U_]+\]`)
-	recoveryLineRE = regexp.MustCompile(`\((\d+)/\d+\)`)
+	statusLineRE         = regexp.MustCompile(`(\d+) blocks .*\[(\d+)/(\d+)\] \[([U_]+)\]`)
+	recoveryLineBlocksRE = regexp.MustCompile(`\((\d+)/\d+\)`)
+	recoveryLinePctRE    = regexp.MustCompile(`= (.+)%`)
+	recoveryLineFinishRE = regexp.MustCompile(`finish=(.+)min`)
+	recoveryLineSpeedRE  = regexp.MustCompile(`speed=(.+)[A-Z]`)
+	componentDeviceRE    = regexp.MustCompile(`(.*)\[\d+\]`)
 )
 
 // MDStat holds info parsed from /proc/mdstat.
@@ -38,12 +42,22 @@ type MDStat struct {
 	DisksTotal int64
 	// Number of failed disks.
 	DisksFailed int64
+	// Number of "down" disks. (the _ indicator in the status line)
+	DisksDown int64
 	// Spare disks in the device.
 	DisksSpare int64
 	// Number of blocks the device holds.
 	BlocksTotal int64
 	// Number of blocks on the device that are in sync.
 	BlocksSynced int64
+	// progress percentage of current sync
+	BlocksSyncedPct float64
+	// estimated finishing time for current sync (in minutes)
+	BlocksSyncedFinishTime float64
+	// current sync speed (in Kilobytes/sec)
+	BlocksSyncedSpeed float64
+	// Name of md component devices
+	Devices []string
 }
 
 // MDStat parses an mdstat-file (/proc/mdstat) and returns a slice of
@@ -52,11 +66,11 @@ type MDStat struct {
 func (fs FS) MDStat() ([]MDStat, error) {
 	data, err := ioutil.ReadFile(fs.proc.Path("mdstat"))
 	if err != nil {
-		return nil, fmt.Errorf("error parsing mdstat %s: %s", fs.proc.Path("mdstat"), err)
+		return nil, err
 	}
 	mdstat, err := parseMDStat(data)
 	if err != nil {
-		return nil, fmt.Errorf("error parsing mdstat %s: %s", fs.proc.Path("mdstat"), err)
+		return nil, fmt.Errorf("error parsing mdstat %q: %w", fs.proc.Path("mdstat"), err)
 	}
 	return mdstat, nil
 }
@@ -82,19 +96,16 @@ func parseMDStat(mdStatData []byte) ([]MDStat, error) {
 		state := deviceFields[2]  // active or inactive
 
 		if len(lines) <= i+3 {
-			return nil, fmt.Errorf(
-				"error parsing %s: too few lines for md device",
-				mdName,
-			)
+			return nil, fmt.Errorf("error parsing %q: too few lines for md device", mdName)
 		}
 
 		// Failed disks have the suffix (F) & Spare disks have the suffix (S).
 		fail := int64(strings.Count(line, "(F)"))
 		spare := int64(strings.Count(line, "(S)"))
-		active, total, size, err := evalStatusLine(lines[i], lines[i+1])
+		active, total, down, size, err := evalStatusLine(lines[i], lines[i+1])
 
 		if err != nil {
-			return nil, fmt.Errorf("error parsing md device lines: %s", err)
+			return nil, fmt.Errorf("error parsing md device lines: %w", err)
 		}
 
 		syncLineIdx := i + 2
@@ -105,13 +116,19 @@ func parseMDStat(mdStatData []byte) ([]MDStat, error) {
 		// If device is syncing at the moment, get the number of currently
 		// synced bytes, otherwise that number equals the size of the device.
 		syncedBlocks := size
+		speed := float64(0)
+		finish := float64(0)
+		pct := float64(0)
 		recovering := strings.Contains(lines[syncLineIdx], "recovery")
 		resyncing := strings.Contains(lines[syncLineIdx], "resync")
+		checking := strings.Contains(lines[syncLineIdx], "check")
 
 		// Append recovery and resyncing state info.
-		if recovering || resyncing {
+		if recovering || resyncing || checking {
 			if recovering {
 				state = "recovering"
+			} else if checking {
+				state = "checking"
 			} else {
 				state = "resyncing"
 			}
@@ -121,9 +138,9 @@ func parseMDStat(mdStatData []byte) ([]MDStat, error) {
 				strings.Contains(lines[syncLineIdx], "DELAYED") {
 				syncedBlocks = 0
 			} else {
-				syncedBlocks, err = evalRecoveryLine(lines[syncLineIdx])
+				syncedBlocks, pct, finish, speed, err = evalRecoveryLine(lines[syncLineIdx])
 				if err != nil {
-					return nil, fmt.Errorf("error parsing sync line in md device %s: %s", mdName, err)
+					return nil, fmt.Errorf("error parsing sync line in md device %q: %w", mdName, err)
 				}
 			}
 		}
@@ -133,62 +150,113 @@ func parseMDStat(mdStatData []byte) ([]MDStat, error) {
 			ActivityState:          state,
 			DisksActive:            active,
 			DisksFailed:            fail,
+			DisksDown:              down,
 			DisksSpare:             spare,
 			DisksTotal:             total,
 			BlocksTotal:            size,
 			BlocksSynced:           syncedBlocks,
+			BlocksSyncedPct:        pct,
+			BlocksSyncedFinishTime: finish,
+			BlocksSyncedSpeed:      speed,
+			Devices:                evalComponentDevices(deviceFields),
 		})
 	}
 
 	return mdStats, nil
 }
 
-func evalStatusLine(deviceLine, statusLine string) (active, total, size int64, err error) {
+func evalStatusLine(deviceLine, statusLine string) (active, total, down, size int64, err error) {
 
 	sizeStr := strings.Fields(statusLine)[0]
 	size, err = strconv.ParseInt(sizeStr, 10, 64)
 	if err != nil {
-		return 0, 0, 0, fmt.Errorf("unexpected statusLine %s: %s", statusLine, err)
+		return 0, 0, 0, 0, fmt.Errorf("unexpected statusLine %q: %w", statusLine, err)
 	}
 
 	if strings.Contains(deviceLine, "raid0") || strings.Contains(deviceLine, "linear") {
 		// In the device deviceLine, only disks have a number associated with them in [].
 		total = int64(strings.Count(deviceLine, "["))
-		return total, total, size, nil
+		return total, total, 0, size, nil
 	}
 
 	if strings.Contains(deviceLine, "inactive") {
-		return 0, 0, size, nil
+		return 0, 0, 0, size, nil
 	}
 
 	matches := statusLineRE.FindStringSubmatch(statusLine)
-	if len(matches) != 4 {
-		return 0, 0, 0, fmt.Errorf("couldn't find all the substring matches: %s", statusLine)
+	if len(matches) != 5 {
+		return 0, 0, 0, 0, fmt.Errorf("couldn't find all the substring matches: %s", statusLine)
 	}
 
 	total, err = strconv.ParseInt(matches[2], 10, 64)
 	if err != nil {
-		return 0, 0, 0, fmt.Errorf("unexpected statusLine %s: %s", statusLine, err)
+		return 0, 0, 0, 0, fmt.Errorf("unexpected statusLine %q: %w", statusLine, err)
 	}
 
 	active, err = strconv.ParseInt(matches[3], 10, 64)
 	if err != nil {
-		return 0, 0, 0, fmt.Errorf("unexpected statusLine %s: %s", statusLine, err)
+		return 0, 0, 0, 0, fmt.Errorf("unexpected statusLine %q: %w", statusLine, err)
 	}
+	down = int64(strings.Count(matches[4], "_"))
 
-	return active, total, size, nil
+	return active, total, down, size, nil
 }
 
-func evalRecoveryLine(recoveryLine string) (syncedBlocks int64, err error) {
-	matches := recoveryLineRE.FindStringSubmatch(recoveryLine)
+func evalRecoveryLine(recoveryLine string) (syncedBlocks int64, pct float64, finish float64, speed float64, err error) {
+	matches := recoveryLineBlocksRE.FindStringSubmatch(recoveryLine)
 	if len(matches) != 2 {
-		return 0, fmt.Errorf("unexpected recoveryLine: %s", recoveryLine)
+		return 0, 0, 0, 0, fmt.Errorf("unexpected recoveryLine: %s", recoveryLine)
 	}
 
 	syncedBlocks, err = strconv.ParseInt(matches[1], 10, 64)
 	if err != nil {
-		return 0, fmt.Errorf("%s in recoveryLine: %s", err, recoveryLine)
+		return 0, 0, 0, 0, fmt.Errorf("error parsing int from recoveryLine %q: %w", recoveryLine, err)
 	}
 
-	return syncedBlocks, nil
+	// Get percentage complete
+	matches = recoveryLinePctRE.FindStringSubmatch(recoveryLine)
+	if len(matches) != 2 {
+		return syncedBlocks, 0, 0, 0, fmt.Errorf("unexpected recoveryLine matching percentage: %s", recoveryLine)
+	}
+	pct, err = strconv.ParseFloat(strings.TrimSpace(matches[1]), 64)
+	if err != nil {
+		return syncedBlocks, 0, 0, 0, fmt.Errorf("error parsing float from recoveryLine %q: %w", recoveryLine, err)
+	}
+
+	// Get time expected left to complete
+	matches = recoveryLineFinishRE.FindStringSubmatch(recoveryLine)
+	if len(matches) != 2 {
+		return syncedBlocks, pct, 0, 0, fmt.Errorf("unexpected recoveryLine matching est. finish time: %s", recoveryLine)
+	}
+	finish, err = strconv.ParseFloat(matches[1], 64)
+	if err != nil {
+		return syncedBlocks, pct, 0, 0, fmt.Errorf("error parsing float from recoveryLine %q: %w", recoveryLine, err)
+	}
+
+	// Get recovery speed
+	matches = recoveryLineSpeedRE.FindStringSubmatch(recoveryLine)
+	if len(matches) != 2 {
+		return syncedBlocks, pct, finish, 0, fmt.Errorf("unexpected recoveryLine matching speed: %s", recoveryLine)
+	}
+	speed, err = strconv.ParseFloat(matches[1], 64)
+	if err != nil {
+		return syncedBlocks, pct, finish, 0, fmt.Errorf("error parsing float from recoveryLine %q: %w", recoveryLine, err)
+	}
+
+	return syncedBlocks, pct, finish, speed, nil
+}
+
+func evalComponentDevices(deviceFields []string) []string {
+	mdComponentDevices := make([]string, 0)
+	if len(deviceFields) > 3 {
+		for _, field := range deviceFields[4:] {
+			match := componentDeviceRE.FindStringSubmatch(field)
+			if match == nil {
+				continue
+			}
+			mdComponentDevices = append(mdComponentDevices, match[1])
+		}
+	}
+
+	return mdComponentDevices
 }

vendor/github.com/prometheus/procfs/meminfo.go

@@ -28,9 +28,9 @@ import (
 type Meminfo struct {
 	// Total usable ram (i.e. physical ram minus a few reserved
 	// bits and the kernel binary code)
-	MemTotal uint64
+	MemTotal *uint64
 	// The sum of LowFree+HighFree
-	MemFree uint64
+	MemFree *uint64
 	// An estimate of how much memory is available for starting
 	// new applications, without swapping. Calculated from
 	// MemFree, SReclaimable, the size of the file LRU lists, and
@@ -39,59 +39,59 @@ type Meminfo struct {
 	// well, and that not all reclaimable slab will be
 	// reclaimable, due to items being in use. The impact of those
 	// factors will vary from system to system.
-	MemAvailable uint64
+	MemAvailable *uint64
 	// Relatively temporary storage for raw disk blocks shouldn't
 	// get tremendously large (20MB or so)
-	Buffers uint64
-	Cached  uint64
+	Buffers *uint64
+	Cached  *uint64
 	// Memory that once was swapped out, is swapped back in but
 	// still also is in the swapfile (if memory is needed it
 	// doesn't need to be swapped out AGAIN because it is already
 	// in the swapfile. This saves I/O)
-	SwapCached uint64
+	SwapCached *uint64
 	// Memory that has been used more recently and usually not
 	// reclaimed unless absolutely necessary.
-	Active uint64
+	Active *uint64
 	// Memory which has been less recently used.  It is more
 	// eligible to be reclaimed for other purposes
-	Inactive     uint64
-	ActiveAnon   uint64
-	InactiveAnon uint64
-	ActiveFile   uint64
-	InactiveFile uint64
-	Unevictable  uint64
-	Mlocked      uint64
+	Inactive     *uint64
+	ActiveAnon   *uint64
+	InactiveAnon *uint64
+	ActiveFile   *uint64
+	InactiveFile *uint64
+	Unevictable  *uint64
+	Mlocked      *uint64
 	// total amount of swap space available
-	SwapTotal uint64
+	SwapTotal *uint64
 	// Memory which has been evicted from RAM, and is temporarily
 	// on the disk
-	SwapFree uint64
+	SwapFree *uint64
 	// Memory which is waiting to get written back to the disk
-	Dirty uint64
+	Dirty *uint64
 	// Memory which is actively being written back to the disk
-	Writeback uint64
+	Writeback *uint64
 	// Non-file backed pages mapped into userspace page tables
-	AnonPages uint64
+	AnonPages *uint64
 	// files which have been mapped, such as libraries
-	Mapped uint64
-	Shmem  uint64
+	Mapped *uint64
+	Shmem  *uint64
 	// in-kernel data structures cache
-	Slab uint64
+	Slab *uint64
 	// Part of Slab, that might be reclaimed, such as caches
-	SReclaimable uint64
+	SReclaimable *uint64
 	// Part of Slab, that cannot be reclaimed on memory pressure
-	SUnreclaim  uint64
-	KernelStack uint64
+	SUnreclaim  *uint64
+	KernelStack *uint64
 	// amount of memory dedicated to the lowest level of page
 	// tables.
-	PageTables uint64
+	PageTables *uint64
 	// NFS pages sent to the server, but not yet committed to
 	// stable storage
-	NFSUnstable uint64
+	NFSUnstable *uint64
 	// Memory used for block device "bounce buffers"
-	Bounce uint64
+	Bounce *uint64
 	// Memory used by FUSE for temporary writeback buffers
-	WritebackTmp uint64
+	WritebackTmp *uint64
 	// Based on the overcommit ratio ('vm.overcommit_ratio'),
 	// this is the total amount of  memory currently available to
 	// be allocated on the system. This limit is only adhered to
@@ -105,7 +105,7 @@ type Meminfo struct {
 	// yield a CommitLimit of 7.3G.
 	// For more details, see the memory overcommit documentation
 	// in vm/overcommit-accounting.
-	CommitLimit uint64
+	CommitLimit *uint64
 	// The amount of memory presently allocated on the system.
 	// The committed memory is a sum of all of the memory which
 	// has been allocated by processes, even if it has not been
@@ -119,27 +119,27 @@ type Meminfo struct {
 	// This is useful if one needs to guarantee that processes will
 	// not fail due to lack of memory once that memory has been
 	// successfully allocated.
-	CommittedAS uint64
+	CommittedAS *uint64
 	// total size of vmalloc memory area
-	VmallocTotal uint64
+	VmallocTotal *uint64
 	// amount of vmalloc area which is used
-	VmallocUsed uint64
+	VmallocUsed *uint64
 	// largest contiguous block of vmalloc area which is free
-	VmallocChunk      uint64
-	HardwareCorrupted uint64
-	AnonHugePages     uint64
-	ShmemHugePages    uint64
-	ShmemPmdMapped    uint64
-	CmaTotal          uint64
-	CmaFree           uint64
-	HugePagesTotal    uint64
-	HugePagesFree     uint64
-	HugePagesRsvd     uint64
-	HugePagesSurp     uint64
-	Hugepagesize      uint64
-	DirectMap4k       uint64
-	DirectMap2M       uint64
-	DirectMap1G       uint64
+	VmallocChunk      *uint64
+	HardwareCorrupted *uint64
+	AnonHugePages     *uint64
+	ShmemHugePages    *uint64
+	ShmemPmdMapped    *uint64
+	CmaTotal          *uint64
+	CmaFree           *uint64
+	HugePagesTotal    *uint64
+	HugePagesFree     *uint64
+	HugePagesRsvd     *uint64
+	HugePagesSurp     *uint64
+	Hugepagesize      *uint64
+	DirectMap4k       *uint64
+	DirectMap2M       *uint64
+	DirectMap1G       *uint64
 }
 
 // Meminfo returns an information about current kernel/system memory statistics.
@@ -152,7 +152,7 @@ func (fs FS) Meminfo() (Meminfo, error) {
 
 	m, err := parseMemInfo(bytes.NewReader(b))
 	if err != nil {
-		return Meminfo{}, fmt.Errorf("failed to parse meminfo: %v", err)
+		return Meminfo{}, fmt.Errorf("failed to parse meminfo: %w", err)
 	}
 
 	return *m, nil
@@ -175,101 +175,101 @@ func parseMemInfo(r io.Reader) (*Meminfo, error) {
 
 		switch fields[0] {
 		case "MemTotal:":
-			m.MemTotal = v
+			m.MemTotal = &v
 		case "MemFree:":
-			m.MemFree = v
+			m.MemFree = &v
 		case "MemAvailable:":
-			m.MemAvailable = v
+			m.MemAvailable = &v
 		case "Buffers:":
-			m.Buffers = v
+			m.Buffers = &v
 		case "Cached:":
-			m.Cached = v
+			m.Cached = &v
 		case "SwapCached:":
-			m.SwapCached = v
+			m.SwapCached = &v
 		case "Active:":
-			m.Active = v
+			m.Active = &v
 		case "Inactive:":
-			m.Inactive = v
+			m.Inactive = &v
 		case "Active(anon):":
-			m.ActiveAnon = v
+			m.ActiveAnon = &v
 		case "Inactive(anon):":
-			m.InactiveAnon = v
+			m.InactiveAnon = &v
 		case "Active(file):":
-			m.ActiveFile = v
+			m.ActiveFile = &v
 		case "Inactive(file):":
-			m.InactiveFile = v
+			m.InactiveFile = &v
 		case "Unevictable:":
-			m.Unevictable = v
+			m.Unevictable = &v
 		case "Mlocked:":
-			m.Mlocked = v
+			m.Mlocked = &v
 		case "SwapTotal:":
-			m.SwapTotal = v
+			m.SwapTotal = &v
 		case "SwapFree:":
-			m.SwapFree = v
+			m.SwapFree = &v
 		case "Dirty:":
-			m.Dirty = v
+			m.Dirty = &v
 		case "Writeback:":
-			m.Writeback = v
+			m.Writeback = &v
 		case "AnonPages:":
-			m.AnonPages = v
+			m.AnonPages = &v
 		case "Mapped:":
-			m.Mapped = v
+			m.Mapped = &v
 		case "Shmem:":
-			m.Shmem = v
+			m.Shmem = &v
 		case "Slab:":
-			m.Slab = v
+			m.Slab = &v
 		case "SReclaimable:":
-			m.SReclaimable = v
+			m.SReclaimable = &v
 		case "SUnreclaim:":
-			m.SUnreclaim = v
+			m.SUnreclaim = &v
 		case "KernelStack:":
-			m.KernelStack = v
+			m.KernelStack = &v
 		case "PageTables:":
-			m.PageTables = v
+			m.PageTables = &v
 		case "NFS_Unstable:":
-			m.NFSUnstable = v
+			m.NFSUnstable = &v
 		case "Bounce:":
-			m.Bounce = v
+			m.Bounce = &v
 		case "WritebackTmp:":
-			m.WritebackTmp = v
+			m.WritebackTmp = &v
 		case "CommitLimit:":
-			m.CommitLimit = v
+			m.CommitLimit = &v
 		case "Committed_AS:":
-			m.CommittedAS = v
+			m.CommittedAS = &v
 		case "VmallocTotal:":
-			m.VmallocTotal = v
+			m.VmallocTotal = &v
 		case "VmallocUsed:":
-			m.VmallocUsed = v
+			m.VmallocUsed = &v
 		case "VmallocChunk:":
-			m.VmallocChunk = v
+			m.VmallocChunk = &v
 		case "HardwareCorrupted:":
-			m.HardwareCorrupted = v
+			m.HardwareCorrupted = &v
 		case "AnonHugePages:":
-			m.AnonHugePages = v
+			m.AnonHugePages = &v
 		case "ShmemHugePages:":
-			m.ShmemHugePages = v
+			m.ShmemHugePages = &v
 		case "ShmemPmdMapped:":
-			m.ShmemPmdMapped = v
+			m.ShmemPmdMapped = &v
 		case "CmaTotal:":
-			m.CmaTotal = v
+			m.CmaTotal = &v
 		case "CmaFree:":
-			m.CmaFree = v
+			m.CmaFree = &v
 		case "HugePages_Total:":
-			m.HugePagesTotal = v
+			m.HugePagesTotal = &v
 		case "HugePages_Free:":
-			m.HugePagesFree = v
+			m.HugePagesFree = &v
 		case "HugePages_Rsvd:":
-			m.HugePagesRsvd = v
+			m.HugePagesRsvd = &v
 		case "HugePages_Surp:":
-			m.HugePagesSurp = v
+			m.HugePagesSurp = &v
 		case "Hugepagesize:":
-			m.Hugepagesize = v
+			m.Hugepagesize = &v
 		case "DirectMap4k:":
-			m.DirectMap4k = v
+			m.DirectMap4k = &v
 		case "DirectMap2M:":
-			m.DirectMap2M = v
+			m.DirectMap2M = &v
 		case "DirectMap1G:":
-			m.DirectMap1G = v
+			m.DirectMap1G = &v
 		}
 	}
 

vendor/github.com/prometheus/procfs/mountinfo.go

@@ -77,7 +77,7 @@ func parseMountInfoString(mountString string) (*MountInfo, error) {
 
 	mountInfo := strings.Split(mountString, " ")
 	mountInfoLength := len(mountInfo)
-	if mountInfoLength < 11 {
+	if mountInfoLength < 10 {
 		return nil, fmt.Errorf("couldn't find enough fields in mount string: %s", mountString)
 	}
 
@@ -144,7 +144,7 @@ func mountOptionsParseOptionalFields(o []string) (map[string]string, error) {
 	return optionalFields, nil
 }
 
-// Parses the mount options, superblock options.
+// mountOptionsParser parses the mount options, superblock options.
 func mountOptionsParser(mountOptions string) map[string]string {
 	opts := make(map[string]string)
 	options := strings.Split(mountOptions, ",")
@@ -161,7 +161,7 @@ func mountOptionsParser(mountOptions string) map[string]string {
 	return opts
 }
 
-// Retrieves mountinfo information from `/proc/self/mountinfo`.
+// GetMounts retrieves mountinfo information from `/proc/self/mountinfo`.
 func GetMounts() ([]*MountInfo, error) {
 	data, err := util.ReadFileNoStat("/proc/self/mountinfo")
 	if err != nil {
@@ -170,7 +170,7 @@ func GetMounts() ([]*MountInfo, error) {
 	return parseMountInfo(data)
 }
 
-// Retrieves mountinfo information from a processes' `/proc/<pid>/mountinfo`.
+// GetProcMounts retrieves mountinfo information from a processes' `/proc/<pid>/mountinfo`.
 func GetProcMounts(pid int) ([]*MountInfo, error) {
 	data, err := util.ReadFileNoStat(fmt.Sprintf("/proc/%d/mountinfo", pid))
 	if err != nil {

vendor/github.com/prometheus/procfs/mountstats.go

@@ -186,6 +186,8 @@ type NFSOperationStats struct {
 	CumulativeTotalResponseMilliseconds uint64
 	// Duration from when a request was enqueued to when it was completely handled.
 	CumulativeTotalRequestMilliseconds uint64
+	// The count of operations that complete with tk_status < 0.  These statuses usually indicate error conditions.
+	Errors uint64
 }
 
 // A NFSTransportStats contains statistics for the NFS mount RPC requests and
@@ -336,12 +338,12 @@ func parseMountStatsNFS(s *bufio.Scanner, statVersion string) (*MountStatsNFS, e
 		if len(ss) == 0 {
 			break
 		}
-		if len(ss) < 2 {
-			return nil, fmt.Errorf("not enough information for NFS stats: %v", ss)
-		}
 
 		switch ss[0] {
 		case fieldOpts:
+			if len(ss) < 2 {
+				return nil, fmt.Errorf("not enough information for NFS stats: %v", ss)
+			}
 			if stats.Opts == nil {
 				stats.Opts = map[string]string{}
 			}
@@ -354,6 +356,9 @@ func parseMountStatsNFS(s *bufio.Scanner, statVersion string) (*MountStatsNFS, e
 				}
 			}
 		case fieldAge:
+			if len(ss) < 2 {
+				return nil, fmt.Errorf("not enough information for NFS stats: %v", ss)
+			}
 			// Age integer is in seconds
 			d, err := time.ParseDuration(ss[1] + "s")
 			if err != nil {
@@ -362,6 +367,9 @@ func parseMountStatsNFS(s *bufio.Scanner, statVersion string) (*MountStatsNFS, e
 
 			stats.Age = d
 		case fieldBytes:
+			if len(ss) < 2 {
+				return nil, fmt.Errorf("not enough information for NFS stats: %v", ss)
+			}
 			bstats, err := parseNFSBytesStats(ss[1:])
 			if err != nil {
 				return nil, err
@@ -369,6 +377,9 @@ func parseMountStatsNFS(s *bufio.Scanner, statVersion string) (*MountStatsNFS, e
 
 			stats.Bytes = *bstats
 		case fieldEvents:
+			if len(ss) < 2 {
+				return nil, fmt.Errorf("not enough information for NFS stats: %v", ss)
+			}
 			estats, err := parseNFSEventsStats(ss[1:])
 			if err != nil {
 				return nil, err
@@ -494,8 +505,8 @@ func parseNFSEventsStats(ss []string) (*NFSEventsStats, error) {
 // line is reached.
 func parseNFSOperationStats(s *bufio.Scanner) ([]NFSOperationStats, error) {
 	const (
-		// Number of expected fields in each per-operation statistics set
-		numFields = 9
+		// Minimum number of expected fields in each per-operation statistics set
+		minFields = 9
 	)
 
 	var ops []NFSOperationStats
@@ -508,12 +519,12 @@ func parseNFSOperationStats(s *bufio.Scanner) ([]NFSOperationStats, error) {
 			break
 		}
 
-		if len(ss) != numFields {
+		if len(ss) < minFields {
 			return nil, fmt.Errorf("invalid NFS per-operations stats: %v", ss)
 		}
 
 		// Skip string operation name for integers
-		ns := make([]uint64, 0, numFields-1)
+		ns := make([]uint64, 0, minFields-1)
 		for _, st := range ss[1:] {
 			n, err := strconv.ParseUint(st, 10, 64)
 			if err != nil {
@@ -523,7 +534,7 @@ func parseNFSOperationStats(s *bufio.Scanner) ([]NFSOperationStats, error) {
 			ns = append(ns, n)
 		}
 
-		ops = append(ops, NFSOperationStats{
+		opStats := NFSOperationStats{
 			Operation:                           strings.TrimSuffix(ss[0], ":"),
 			Requests:                            ns[0],
 			Transmissions:                       ns[1],
@@ -533,7 +544,13 @@ func parseNFSOperationStats(s *bufio.Scanner) ([]NFSOperationStats, error) {
 			CumulativeQueueMilliseconds:         ns[5],
 			CumulativeTotalResponseMilliseconds: ns[6],
 			CumulativeTotalRequestMilliseconds:  ns[7],
-		})
+		}
+
+		if len(ns) > 8 {
+			opStats.Errors = ns[8]
+		}
+
+		ops = append(ops, opStats)
 	}
 
 	return ops, s.Err()

vendor/github.com/prometheus/procfs/net_conntrackstat.go

@@ -38,7 +38,7 @@ type ConntrackStatEntry struct {
 	SearchRestart uint64
 }
 
-// Retrieves netfilter's conntrack statistics, split by CPU cores
+// ConntrackStat retrieves netfilter's conntrack statistics, split by CPU cores
 func (fs FS) ConntrackStat() ([]ConntrackStatEntry, error) {
 	return readConntrackStat(fs.proc.Path("net", "stat", "nf_conntrack"))
 }
@@ -55,7 +55,7 @@ func readConntrackStat(path string) ([]ConntrackStatEntry, error) {
 
 	stat, err := parseConntrackStat(bytes.NewReader(b))
 	if err != nil {
-		return nil, fmt.Errorf("failed to read conntrack stats from %q: %v", path, err)
+		return nil, fmt.Errorf("failed to read conntrack stats from %q: %w", path, err)
 	}
 
 	return stat, nil
@@ -147,7 +147,7 @@ func parseConntrackStatEntry(fields []string) (*ConntrackStatEntry, error) {
 func parseConntrackStatField(field string) (uint64, error) {
 	val, err := strconv.ParseUint(field, 16, 64)
 	if err != nil {
-		return 0, fmt.Errorf("couldn't parse \"%s\" field: %s", field, err)
+		return 0, fmt.Errorf("couldn't parse %q field: %w", field, err)
 	}
 	return val, err
 }

vendor/github.com/prometheus/procfs/net_ip_socket.go

@@ -0,0 +1,226 @@
+// Copyright 2020 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"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const (
+	// readLimit is used by io.LimitReader while reading the content of the
+	// /proc/net/udp{,6} files. The number of lines inside such a file is dynamic
+	// as each line represents a single used socket.
+	// In theory, the number of available sockets is 65535 (2^16 - 1) per IP.
+	// With e.g. 150 Byte per line and the maximum number of 65535,
+	// the reader needs to handle 150 Byte * 65535 =~ 10 MB for a single IP.
+	readLimit = 4294967296 // Byte -> 4 GiB
+)
+
+// this contains generic data structures for both udp and tcp sockets
+type (
+	// NetIPSocket represents the contents of /proc/net/{t,u}dp{,6} file without the header.
+	NetIPSocket []*netIPSocketLine
+
+	// NetIPSocketSummary provides already computed values like the total queue lengths or
+	// the total number of used sockets. In contrast to NetIPSocket it does not collect
+	// the parsed lines into a slice.
+	NetIPSocketSummary struct {
+		// TxQueueLength shows the total queue length of all parsed tx_queue lengths.
+		TxQueueLength uint64
+		// RxQueueLength shows the total queue length of all parsed rx_queue lengths.
+		RxQueueLength uint64
+		// UsedSockets shows the total number of parsed lines representing the
+		// number of used sockets.
+		UsedSockets uint64
+	}
+
+	// netIPSocketLine represents the fields parsed from a single line
+	// in /proc/net/{t,u}dp{,6}. Fields which are not used by IPSocket are skipped.
+	// For the proc file format details, see https://linux.die.net/man/5/proc.
+	netIPSocketLine struct {
+		Sl        uint64
+		LocalAddr net.IP
+		LocalPort uint64
+		RemAddr   net.IP
+		RemPort   uint64
+		St        uint64
+		TxQueue   uint64
+		RxQueue   uint64
+		UID       uint64
+		Inode     uint64
+	}
+)
+
+func newNetIPSocket(file string) (NetIPSocket, error) {
+	f, err := os.Open(file)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	var netIPSocket NetIPSocket
+
+	lr := io.LimitReader(f, readLimit)
+	s := bufio.NewScanner(lr)
+	s.Scan() // skip first line with headers
+	for s.Scan() {
+		fields := strings.Fields(s.Text())
+		line, err := parseNetIPSocketLine(fields)
+		if err != nil {
+			return nil, err
+		}
+		netIPSocket = append(netIPSocket, line)
+	}
+	if err := s.Err(); err != nil {
+		return nil, err
+	}
+	return netIPSocket, nil
+}
+
+// newNetIPSocketSummary creates a new NetIPSocket{,6} from the contents of the given file.
+func newNetIPSocketSummary(file string) (*NetIPSocketSummary, error) {
+	f, err := os.Open(file)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	var netIPSocketSummary NetIPSocketSummary
+
+	lr := io.LimitReader(f, readLimit)
+	s := bufio.NewScanner(lr)
+	s.Scan() // skip first line with headers
+	for s.Scan() {
+		fields := strings.Fields(s.Text())
+		line, err := parseNetIPSocketLine(fields)
+		if err != nil {
+			return nil, err
+		}
+		netIPSocketSummary.TxQueueLength += line.TxQueue
+		netIPSocketSummary.RxQueueLength += line.RxQueue
+		netIPSocketSummary.UsedSockets++
+	}
+	if err := s.Err(); err != nil {
+		return nil, err
+	}
+	return &netIPSocketSummary, nil
+}
+
+// the /proc/net/{t,u}dp{,6} files are network byte order for ipv4 and for ipv6 the address is four words consisting of four bytes each. In each of those four words the four bytes are written in reverse order.
+
+func parseIP(hexIP string) (net.IP, error) {
+	var byteIP []byte
+	byteIP, err := hex.DecodeString(hexIP)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse address field in socket line %q", hexIP)
+	}
+	switch len(byteIP) {
+	case 4:
+		return net.IP{byteIP[3], byteIP[2], byteIP[1], byteIP[0]}, nil
+	case 16:
+		i := net.IP{
+			byteIP[3], byteIP[2], byteIP[1], byteIP[0],
+			byteIP[7], byteIP[6], byteIP[5], byteIP[4],
+			byteIP[11], byteIP[10], byteIP[9], byteIP[8],
+			byteIP[15], byteIP[14], byteIP[13], byteIP[12],
+		}
+		return i, nil
+	default:
+		return nil, fmt.Errorf("Unable to parse IP %s", hexIP)
+	}
+}
+
+// parseNetIPSocketLine parses a single line, represented by a list of fields.
+func parseNetIPSocketLine(fields []string) (*netIPSocketLine, error) {
+	line := &netIPSocketLine{}
+	if len(fields) < 10 {
+		return nil, fmt.Errorf(
+			"cannot parse net socket line as it has less then 10 columns %q",
+			strings.Join(fields, " "),
+		)
+	}
+	var err error // parse error
+
+	// sl
+	s := strings.Split(fields[0], ":")
+	if len(s) != 2 {
+		return nil, fmt.Errorf("cannot parse sl field in socket line %q", fields[0])
+	}
+
+	if line.Sl, err = strconv.ParseUint(s[0], 0, 64); err != nil {
+		return nil, fmt.Errorf("cannot parse sl value in socket line: %w", err)
+	}
+	// local_address
+	l := strings.Split(fields[1], ":")
+	if len(l) != 2 {
+		return nil, fmt.Errorf("cannot parse local_address field in socket line %q", fields[1])
+	}
+	if line.LocalAddr, err = parseIP(l[0]); err != nil {
+		return nil, err
+	}
+	if line.LocalPort, err = strconv.ParseUint(l[1], 16, 64); err != nil {
+		return nil, fmt.Errorf("cannot parse local_address port value in socket line: %w", err)
+	}
+
+	// remote_address
+	r := strings.Split(fields[2], ":")
+	if len(r) != 2 {
+		return nil, fmt.Errorf("cannot parse rem_address field in socket line %q", fields[1])
+	}
+	if line.RemAddr, err = parseIP(r[0]); err != nil {
+		return nil, err
+	}
+	if line.RemPort, err = strconv.ParseUint(r[1], 16, 64); err != nil {
+		return nil, fmt.Errorf("cannot parse rem_address port value in socket line: %w", err)
+	}
+
+	// st
+	if line.St, err = strconv.ParseUint(fields[3], 16, 64); err != nil {
+		return nil, fmt.Errorf("cannot parse st value in socket line: %w", err)
+	}
+
+	// tx_queue and rx_queue
+	q := strings.Split(fields[4], ":")
+	if len(q) != 2 {
+		return nil, fmt.Errorf(
+			"cannot parse tx/rx queues in socket line as it has a missing colon %q",
+			fields[4],
+		)
+	}
+	if line.TxQueue, err = strconv.ParseUint(q[0], 16, 64); err != nil {
+		return nil, fmt.Errorf("cannot parse tx_queue value in socket line: %w", err)
+	}
+	if line.RxQueue, err = strconv.ParseUint(q[1], 16, 64); err != nil {
+		return nil, fmt.Errorf("cannot parse rx_queue value in socket line: %w", err)
+	}
+
+	// uid
+	if line.UID, err = strconv.ParseUint(fields[7], 0, 64); err != nil {
+		return nil, fmt.Errorf("cannot parse uid value in socket line: %w", err)
+	}
+
+	// inode
+	if line.Inode, err = strconv.ParseUint(fields[9], 0, 64); err != nil {
+		return nil, fmt.Errorf("cannot parse inode value in socket line: %w", err)
+	}
+
+	return line, nil
+}

vendor/github.com/prometheus/procfs/net_protocols.go

@@ -0,0 +1,180 @@
+// Copyright 2020 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"
+	"bytes"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/procfs/internal/util"
+)
+
+// NetProtocolStats stores the contents from /proc/net/protocols
+type NetProtocolStats map[string]NetProtocolStatLine
+
+// NetProtocolStatLine contains a single line parsed from /proc/net/protocols. We
+// only care about the first six columns as the rest are not likely to change
+// and only serve to provide a set of capabilities for each protocol.
+type NetProtocolStatLine struct {
+	Name         string // 0 The name of the protocol
+	Size         uint64 // 1 The size, in bytes, of a given protocol structure. e.g. sizeof(struct tcp_sock) or sizeof(struct unix_sock)
+	Sockets      int64  // 2 Number of sockets in use by this protocol
+	Memory       int64  // 3 Number of 4KB pages allocated by all sockets of this protocol
+	Pressure     int    // 4 This is either yes, no, or NI (not implemented). For the sake of simplicity we treat NI as not experiencing memory pressure.
+	MaxHeader    uint64 // 5 Protocol specific max header size
+	Slab         bool   // 6 Indicates whether or not memory is allocated from the SLAB
+	ModuleName   string // 7 The name of the module that implemented this protocol or "kernel" if not from a module
+	Capabilities NetProtocolCapabilities
+}
+
+// NetProtocolCapabilities contains a list of capabilities for each protocol
+type NetProtocolCapabilities struct {
+	Close               bool // 8
+	Connect             bool // 9
+	Disconnect          bool // 10
+	Accept              bool // 11
+	IoCtl               bool // 12
+	Init                bool // 13
+	Destroy             bool // 14
+	Shutdown            bool // 15
+	SetSockOpt          bool // 16
+	GetSockOpt          bool // 17
+	SendMsg             bool // 18
+	RecvMsg             bool // 19
+	SendPage            bool // 20
+	Bind                bool // 21
+	BacklogRcv          bool // 22
+	Hash                bool // 23
+	UnHash              bool // 24
+	GetPort             bool // 25
+	EnterMemoryPressure bool // 26
+}
+
+// NetProtocols reads stats from /proc/net/protocols and returns a map of
+// PortocolStatLine entries. As of this writing no official Linux Documentation
+// exists, however the source is fairly self-explanatory and the format seems
+// stable since its introduction in 2.6.12-rc2
+// Linux 2.6.12-rc2 - https://elixir.bootlin.com/linux/v2.6.12-rc2/source/net/core/sock.c#L1452
+// Linux 5.10 - https://elixir.bootlin.com/linux/v5.10.4/source/net/core/sock.c#L3586
+func (fs FS) NetProtocols() (NetProtocolStats, error) {
+	data, err := util.ReadFileNoStat(fs.proc.Path("net/protocols"))
+	if err != nil {
+		return NetProtocolStats{}, err
+	}
+	return parseNetProtocols(bufio.NewScanner(bytes.NewReader(data)))
+}
+
+func parseNetProtocols(s *bufio.Scanner) (NetProtocolStats, error) {
+	nps := NetProtocolStats{}
+
+	// Skip the header line
+	s.Scan()
+
+	for s.Scan() {
+		line, err := nps.parseLine(s.Text())
+		if err != nil {
+			return NetProtocolStats{}, err
+		}
+
+		nps[line.Name] = *line
+	}
+	return nps, nil
+}
+
+func (ps NetProtocolStats) parseLine(rawLine string) (*NetProtocolStatLine, error) {
+	line := &NetProtocolStatLine{Capabilities: NetProtocolCapabilities{}}
+	var err error
+	const enabled = "yes"
+	const disabled = "no"
+
+	fields := strings.Fields(rawLine)
+	line.Name = fields[0]
+	line.Size, err = strconv.ParseUint(fields[1], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	line.Sockets, err = strconv.ParseInt(fields[2], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	line.Memory, err = strconv.ParseInt(fields[3], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	if fields[4] == enabled {
+		line.Pressure = 1
+	} else if fields[4] == disabled {
+		line.Pressure = 0
+	} else {
+		line.Pressure = -1
+	}
+	line.MaxHeader, err = strconv.ParseUint(fields[5], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	if fields[6] == enabled {
+		line.Slab = true
+	} else if fields[6] == disabled {
+		line.Slab = false
+	} else {
+		return nil, fmt.Errorf("unable to parse capability for protocol: %s", line.Name)
+	}
+	line.ModuleName = fields[7]
+
+	err = line.Capabilities.parseCapabilities(fields[8:])
+	if err != nil {
+		return nil, err
+	}
+
+	return line, nil
+}
+
+func (pc *NetProtocolCapabilities) parseCapabilities(capabilities []string) error {
+	// The capabilities are all bools so we can loop over to map them
+	capabilityFields := [...]*bool{
+		&pc.Close,
+		&pc.Connect,
+		&pc.Disconnect,
+		&pc.Accept,
+		&pc.IoCtl,
+		&pc.Init,
+		&pc.Destroy,
+		&pc.Shutdown,
+		&pc.SetSockOpt,
+		&pc.GetSockOpt,
+		&pc.SendMsg,
+		&pc.RecvMsg,
+		&pc.SendPage,
+		&pc.Bind,
+		&pc.BacklogRcv,
+		&pc.Hash,
+		&pc.UnHash,
+		&pc.GetPort,
+		&pc.EnterMemoryPressure,
+	}
+
+	for i := 0; i < len(capabilities); i++ {
+		if capabilities[i] == "y" {
+			*capabilityFields[i] = true
+		} else if capabilities[i] == "n" {
+			*capabilityFields[i] = false
+		} else {
+			return fmt.Errorf("unable to parse capability block for protocol: position %d", i)
+		}
+	}
+	return nil
+}

vendor/github.com/prometheus/procfs/net_sockstat.go

@@ -70,7 +70,7 @@ func readSockstat(name string) (*NetSockstat, error) {
 
 	stat, err := parseSockstat(bytes.NewReader(b))
 	if err != nil {
-		return nil, fmt.Errorf("failed to read sockstats from %q: %v", name, err)
+		return nil, fmt.Errorf("failed to read sockstats from %q: %w", name, err)
 	}
 
 	return stat, nil
@@ -90,7 +90,7 @@ func parseSockstat(r io.Reader) (*NetSockstat, error) {
 		// The remaining fields are key/value pairs.
 		kvs, err := parseSockstatKVs(fields[1:])
 		if err != nil {
-			return nil, fmt.Errorf("error parsing sockstat key/value pairs from %q: %v", s.Text(), err)
+			return nil, fmt.Errorf("error parsing sockstat key/value pairs from %q: %w", s.Text(), err)
 		}
 
 		// The first field is the protocol. We must trim its colon suffix.

vendor/github.com/prometheus/procfs/net_softnet.go

@@ -51,7 +51,7 @@ func (fs FS) NetSoftnetStat() ([]SoftnetStat, error) {
 
 	entries, err := parseSoftnet(bytes.NewReader(b))
 	if err != nil {
-		return nil, fmt.Errorf("failed to parse /proc/net/softnet_stat: %v", err)
+		return nil, fmt.Errorf("failed to parse /proc/net/softnet_stat: %w", err)
 	}
 
 	return entries, nil

vendor/github.com/prometheus/procfs/net_tcp.go

@@ -0,0 +1,64 @@
+// Copyright 2020 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
+
+type (
+	// NetTCP represents the contents of /proc/net/tcp{,6} file without the header.
+	NetTCP []*netIPSocketLine
+
+	// NetTCPSummary provides already computed values like the total queue lengths or
+	// the total number of used sockets. In contrast to NetTCP it does not collect
+	// the parsed lines into a slice.
+	NetTCPSummary NetIPSocketSummary
+)
+
+// NetTCP returns the IPv4 kernel/networking statistics for TCP datagrams
+// read from /proc/net/tcp.
+func (fs FS) NetTCP() (NetTCP, error) {
+	return newNetTCP(fs.proc.Path("net/tcp"))
+}
+
+// NetTCP6 returns the IPv6 kernel/networking statistics for TCP datagrams
+// read from /proc/net/tcp6.
+func (fs FS) NetTCP6() (NetTCP, error) {
+	return newNetTCP(fs.proc.Path("net/tcp6"))
+}
+
+// NetTCPSummary returns already computed statistics like the total queue lengths
+// for TCP datagrams read from /proc/net/tcp.
+func (fs FS) NetTCPSummary() (*NetTCPSummary, error) {
+	return newNetTCPSummary(fs.proc.Path("net/tcp"))
+}
+
+// NetTCP6Summary returns already computed statistics like the total queue lengths
+// for TCP datagrams read from /proc/net/tcp6.
+func (fs FS) NetTCP6Summary() (*NetTCPSummary, error) {
+	return newNetTCPSummary(fs.proc.Path("net/tcp6"))
+}
+
+// newNetTCP creates a new NetTCP{,6} from the contents of the given file.
+func newNetTCP(file string) (NetTCP, error) {
+	n, err := newNetIPSocket(file)
+	n1 := NetTCP(n)
+	return n1, err
+}
+
+func newNetTCPSummary(file string) (*NetTCPSummary, error) {
+	n, err := newNetIPSocketSummary(file)
+	if n == nil {
+		return nil, err
+	}
+	n1 := NetTCPSummary(*n)
+	return &n1, err
+}

vendor/github.com/prometheus/procfs/net_udp.go

@@ -13,58 +13,14 @@
 
 package procfs
 
-import (
-	"bufio"
-	"encoding/hex"
-	"fmt"
-	"io"
-	"net"
-	"os"
-	"strconv"
-	"strings"
-)
-
-const (
-	// readLimit is used by io.LimitReader while reading the content of the
-	// /proc/net/udp{,6} files. The number of lines inside such a file is dynamic
-	// as each line represents a single used socket.
-	// In theory, the number of available sockets is 65535 (2^16 - 1) per IP.
-	// With e.g. 150 Byte per line and the maximum number of 65535,
-	// the reader needs to handle 150 Byte * 65535 =~ 10 MB for a single IP.
-	readLimit = 4294967296 // Byte -> 4 GiB
-)
-
 type (
 	// NetUDP represents the contents of /proc/net/udp{,6} file without the header.
-	NetUDP []*netUDPLine
+	NetUDP []*netIPSocketLine
 
 	// NetUDPSummary provides already computed values like the total queue lengths or
 	// the total number of used sockets. In contrast to NetUDP it does not collect
 	// the parsed lines into a slice.
-	NetUDPSummary struct {
-		// TxQueueLength shows the total queue length of all parsed tx_queue lengths.
-		TxQueueLength uint64
-		// RxQueueLength shows the total queue length of all parsed rx_queue lengths.
-		RxQueueLength uint64
-		// UsedSockets shows the total number of parsed lines representing the
-		// number of used sockets.
-		UsedSockets uint64
-	}
-
-	// netUDPLine represents the fields parsed from a single line
-	// in /proc/net/udp{,6}. Fields which are not used by UDP are skipped.
-	// For the proc file format details, see https://linux.die.net/man/5/proc.
-	netUDPLine struct {
-		Sl        uint64
-		LocalAddr net.IP
-		LocalPort uint64
-		RemAddr   net.IP
-		RemPort   uint64
-		St        uint64
-		TxQueue   uint64
-		RxQueue   uint64
-		UID       uint64
-	}
+	NetUDPSummary NetIPSocketSummary
 )
 
 // NetUDP returns the IPv4 kernel/networking statistics for UDP datagrams
@@ -93,137 +49,16 @@ func (fs FS) NetUDP6Summary() (*NetUDPSummary, error) {
 
 // newNetUDP creates a new NetUDP{,6} from the contents of the given file.
 func newNetUDP(file string) (NetUDP, error) {
-	f, err := os.Open(file)
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	netUDP := NetUDP{}
-
-	lr := io.LimitReader(f, readLimit)
-	s := bufio.NewScanner(lr)
-	s.Scan() // skip first line with headers
-	for s.Scan() {
-		fields := strings.Fields(s.Text())
-		line, err := parseNetUDPLine(fields)
-		if err != nil {
-			return nil, err
-		}
-		netUDP = append(netUDP, line)
-	}
-	if err := s.Err(); err != nil {
-		return nil, err
-	}
-	return netUDP, nil
+	n, err := newNetIPSocket(file)
+	n1 := NetUDP(n)
+	return n1, err
 }
 
-// newNetUDPSummary creates a new NetUDP{,6} from the contents of the given file.
 func newNetUDPSummary(file string) (*NetUDPSummary, error) {
-	f, err := os.Open(file)
-	if err != nil {
+	n, err := newNetIPSocketSummary(file)
+	if n == nil {
 		return nil, err
 	}
-	defer f.Close()
-
-	netUDPSummary := &NetUDPSummary{}
-
-	lr := io.LimitReader(f, readLimit)
-	s := bufio.NewScanner(lr)
-	s.Scan() // skip first line with headers
-	for s.Scan() {
-		fields := strings.Fields(s.Text())
-		line, err := parseNetUDPLine(fields)
-		if err != nil {
-			return nil, err
-		}
-		netUDPSummary.TxQueueLength += line.TxQueue
-		netUDPSummary.RxQueueLength += line.RxQueue
-		netUDPSummary.UsedSockets++
-	}
-	if err := s.Err(); err != nil {
-		return nil, err
-	}
-	return netUDPSummary, nil
-}
-
-// parseNetUDPLine parses a single line, represented by a list of fields.
-func parseNetUDPLine(fields []string) (*netUDPLine, error) {
-	line := &netUDPLine{}
-	if len(fields) < 8 {
-		return nil, fmt.Errorf(
-			"cannot parse net udp socket line as it has less then 8 columns: %s",
-			strings.Join(fields, " "),
-		)
-	}
-	var err error // parse error
-
-	// sl
-	s := strings.Split(fields[0], ":")
-	if len(s) != 2 {
-		return nil, fmt.Errorf(
-			"cannot parse sl field in udp socket line: %s", fields[0])
-	}
-
-	if line.Sl, err = strconv.ParseUint(s[0], 0, 64); err != nil {
-		return nil, fmt.Errorf("cannot parse sl value in udp socket line: %s", err)
-	}
-	// local_address
-	l := strings.Split(fields[1], ":")
-	if len(l) != 2 {
-		return nil, fmt.Errorf(
-			"cannot parse local_address field in udp socket line: %s", fields[1])
-	}
-	if line.LocalAddr, err = hex.DecodeString(l[0]); err != nil {
-		return nil, fmt.Errorf(
-			"cannot parse local_address value in udp socket line: %s", err)
-	}
-	if line.LocalPort, err = strconv.ParseUint(l[1], 16, 64); err != nil {
-		return nil, fmt.Errorf(
-			"cannot parse local_address port value in udp socket line: %s", err)
-	}
-
-	// remote_address
-	r := strings.Split(fields[2], ":")
-	if len(r) != 2 {
-		return nil, fmt.Errorf(
-			"cannot parse rem_address field in udp socket line: %s", fields[1])
-	}
-	if line.RemAddr, err = hex.DecodeString(r[0]); err != nil {
-		return nil, fmt.Errorf(
-			"cannot parse rem_address value in udp socket line: %s", err)
-	}
-	if line.RemPort, err = strconv.ParseUint(r[1], 16, 64); err != nil {
-		return nil, fmt.Errorf(
-			"cannot parse rem_address port value in udp socket line: %s", err)
-	}
-
-	// st
-	if line.St, err = strconv.ParseUint(fields[3], 16, 64); err != nil {
-		return nil, fmt.Errorf(
-			"cannot parse st value in udp socket line: %s", err)
-	}
-
-	// tx_queue and rx_queue
-	q := strings.Split(fields[4], ":")
-	if len(q) != 2 {
-		return nil, fmt.Errorf(
-			"cannot parse tx/rx queues in udp socket line as it has a missing colon: %s",
-			fields[4],
-		)
-	}
-	if line.TxQueue, err = strconv.ParseUint(q[0], 16, 64); err != nil {
-		return nil, fmt.Errorf("cannot parse tx_queue value in udp socket line: %s", err)
-	}
-	if line.RxQueue, err = strconv.ParseUint(q[1], 16, 64); err != nil {
-		return nil, fmt.Errorf("cannot parse rx_queue value in udp socket line: %s", err)
-	}
-
-	// uid
-	if line.UID, err = strconv.ParseUint(fields[7], 0, 64); err != nil {
-		return nil, fmt.Errorf(
-			"cannot parse uid value in udp socket line: %s", err)
-	}
-
-	return line, nil
+	n1 := NetUDPSummary(*n)
+	return &n1, err
 }

vendor/github.com/prometheus/procfs/net_unix.go

@@ -108,14 +108,14 @@ func parseNetUNIX(r io.Reader) (*NetUNIX, error) {
 		line := s.Text()
 		item, err := nu.parseLine(line, hasInode, minFields)
 		if err != nil {
-			return nil, fmt.Errorf("failed to parse /proc/net/unix data %q: %v", line, err)
+			return nil, fmt.Errorf("failed to parse /proc/net/unix data %q: %w", line, err)
 		}
 
 		nu.Rows = append(nu.Rows, item)
 	}
 
 	if err := s.Err(); err != nil {
-		return nil, fmt.Errorf("failed to scan /proc/net/unix data: %v", err)
+		return nil, fmt.Errorf("failed to scan /proc/net/unix data: %w", err)
 	}
 
 	return &nu, nil
@@ -136,29 +136,29 @@ func (u *NetUNIX) parseLine(line string, hasInode bool, min int) (*NetUNIXLine,
 
 	users, err := u.parseUsers(fields[1])
 	if err != nil {
-		return nil, fmt.Errorf("failed to parse ref count(%s): %v", fields[1], err)
+		return nil, fmt.Errorf("failed to parse ref count %q: %w", fields[1], err)
 	}
 
 	flags, err := u.parseFlags(fields[3])
 	if err != nil {
-		return nil, fmt.Errorf("failed to parse flags(%s): %v", fields[3], err)
+		return nil, fmt.Errorf("failed to parse flags %q: %w", fields[3], err)
 	}
 
 	typ, err := u.parseType(fields[4])
 	if err != nil {
-		return nil, fmt.Errorf("failed to parse type(%s): %v", fields[4], err)
+		return nil, fmt.Errorf("failed to parse type %q: %w", fields[4], err)
 	}
 
 	state, err := u.parseState(fields[5])
 	if err != nil {
-		return nil, fmt.Errorf("failed to parse state(%s): %v", fields[5], err)
+		return nil, fmt.Errorf("failed to parse state %q: %w", fields[5], err)
 	}
 
 	var inode uint64
 	if hasInode {
 		inode, err = u.parseInode(fields[6])
 		if err != nil {
-			return nil, fmt.Errorf("failed to parse inode(%s): %v", fields[6], err)
+			return nil, fmt.Errorf("failed to parse inode %q: %w", fields[6], err)
 		}
 	}
 

vendor/github.com/prometheus/procfs/netstat.go

@@ -0,0 +1,68 @@
+// Copyright 2020 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"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+// NetStat contains statistics for all the counters from one file
+type NetStat struct {
+	Filename string
+	Stats    map[string][]uint64
+}
+
+// NetStat retrieves stats from /proc/net/stat/
+func (fs FS) NetStat() ([]NetStat, error) {
+	statFiles, err := filepath.Glob(fs.proc.Path("net/stat/*"))
+	if err != nil {
+		return nil, err
+	}
+
+	var netStatsTotal []NetStat
+
+	for _, filePath := range statFiles {
+		file, err := os.Open(filePath)
+		if err != nil {
+			return nil, err
+		}
+
+		netStatFile := NetStat{
+			Filename: filepath.Base(filePath),
+			Stats:    make(map[string][]uint64),
+		}
+		scanner := bufio.NewScanner(file)
+		scanner.Scan()
+		// First string is always a header for stats
+		var headers []string
+		headers = append(headers, strings.Fields(scanner.Text())...)
+
+		// Other strings represent per-CPU counters
+		for scanner.Scan() {
+			for num, counter := range strings.Fields(scanner.Text()) {
+				value, err := strconv.ParseUint(counter, 16, 32)
+				if err != nil {
+					return nil, err
+				}
+				netStatFile.Stats[headers[num]] = append(netStatFile.Stats[headers[num]], value)
+			}
+		}
+		netStatsTotal = append(netStatsTotal, netStatFile)
+	}
+	return netStatsTotal, nil
+}

vendor/github.com/prometheus/procfs/proc.go

@@ -105,7 +105,7 @@ func (fs FS) AllProcs() (Procs, error) {
 
 	names, err := d.Readdirnames(-1)
 	if err != nil {
-		return Procs{}, fmt.Errorf("could not read %s: %s", d.Name(), err)
+		return Procs{}, fmt.Errorf("could not read %q: %w", d.Name(), err)
 	}
 
 	p := Procs{}
@@ -134,6 +134,27 @@ func (p Proc) CmdLine() ([]string, error) {
 	return strings.Split(string(bytes.TrimRight(data, string("\x00"))), string(byte(0))), nil
 }
 
+// Wchan returns the wchan (wait channel) of a process.
+func (p Proc) Wchan() (string, error) {
+	f, err := os.Open(p.path("wchan"))
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+
+	data, err := ioutil.ReadAll(f)
+	if err != nil {
+		return "", err
+	}
+
+	wchan := string(data)
+	if wchan == "" || wchan == "0" {
+		return "", nil
+	}
+
+	return wchan, nil
+}
+
 // Comm returns the command name of a process.
 func (p Proc) Comm() (string, error) {
 	data, err := util.ReadFileNoStat(p.path("comm"))
@@ -185,7 +206,7 @@ func (p Proc) FileDescriptors() ([]uintptr, error) {
 	for i, n := range names {
 		fd, err := strconv.ParseInt(n, 10, 32)
 		if err != nil {
-			return nil, fmt.Errorf("could not parse fd %s: %s", n, err)
+			return nil, fmt.Errorf("could not parse fd %q: %w", n, err)
 		}
 		fds[i] = uintptr(fd)
 	}
@@ -257,7 +278,7 @@ func (p Proc) fileDescriptors() ([]string, error) {
 
 	names, err := d.Readdirnames(-1)
 	if err != nil {
-		return nil, fmt.Errorf("could not read %s: %s", d.Name(), err)
+		return nil, fmt.Errorf("could not read %q: %w", d.Name(), err)
 	}
 
 	return names, nil

vendor/github.com/prometheus/procfs/proc_cgroup.go

@@ -0,0 +1,98 @@
+// Copyright 2020 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"
+	"bytes"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/procfs/internal/util"
+)
+
+// Cgroup models one line from /proc/[pid]/cgroup. Each Cgroup struct describes the the placement of a PID inside a
+// specific control hierarchy. The kernel has two cgroup APIs, v1 and v2. v1 has one hierarchy per available resource
+// controller, while v2 has one unified hierarchy shared by all controllers. Regardless of v1 or v2, all hierarchies
+// contain all running processes, so the question answerable with a Cgroup struct is 'where is this process in
+// this hierarchy' (where==what path on the specific cgroupfs). By prefixing this path with the mount point of
+// *this specific* hierarchy, you can locate the relevant pseudo-files needed to read/set the data for this PID
+// in this hierarchy
+//
+// Also see http://man7.org/linux/man-pages/man7/cgroups.7.html
+type Cgroup struct {
+	// HierarchyID that can be matched to a named hierarchy using /proc/cgroups. Cgroups V2 only has one
+	// hierarchy, so HierarchyID is always 0. For cgroups v1 this is a unique ID number
+	HierarchyID int
+	// Controllers using this hierarchy of processes. Controllers are also known as subsystems. For
+	// Cgroups V2 this may be empty, as all active controllers use the same hierarchy
+	Controllers []string
+	// Path of this control group, relative to the mount point of the cgroupfs representing this specific
+	// hierarchy
+	Path string
+}
+
+// parseCgroupString parses each line of the /proc/[pid]/cgroup file
+// Line format is hierarchyID:[controller1,controller2]:path
+func parseCgroupString(cgroupStr string) (*Cgroup, error) {
+	var err error
+
+	fields := strings.SplitN(cgroupStr, ":", 3)
+	if len(fields) < 3 {
+		return nil, fmt.Errorf("at least 3 fields required, found %d fields in cgroup string: %s", len(fields), cgroupStr)
+	}
+
+	cgroup := &Cgroup{
+		Path:        fields[2],
+		Controllers: nil,
+	}
+	cgroup.HierarchyID, err = strconv.Atoi(fields[0])
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse hierarchy ID")
+	}
+	if fields[1] != "" {
+		ssNames := strings.Split(fields[1], ",")
+		cgroup.Controllers = append(cgroup.Controllers, ssNames...)
+	}
+	return cgroup, nil
+}
+
+// parseCgroups reads each line of the /proc/[pid]/cgroup file
+func parseCgroups(data []byte) ([]Cgroup, error) {
+	var cgroups []Cgroup
+	scanner := bufio.NewScanner(bytes.NewReader(data))
+	for scanner.Scan() {
+		mountString := scanner.Text()
+		parsedMounts, err := parseCgroupString(mountString)
+		if err != nil {
+			return nil, err
+		}
+		cgroups = append(cgroups, *parsedMounts)
+	}
+
+	err := scanner.Err()
+	return cgroups, err
+}
+
+// Cgroups reads from /proc/<pid>/cgroups and returns a []*Cgroup struct locating this PID in each process
+// control hierarchy running on this system. On every system (v1 and v2), all hierarchies contain all processes,
+// so the len of the returned struct is equal to the number of active hierarchies on this system
+func (p Proc) Cgroups() ([]Cgroup, error) {
+	data, err := util.ReadFileNoStat(p.path("cgroup"))
+	if err != nil {
+		return nil, err
+	}
+	return parseCgroups(data)
+}

vendor/github.com/prometheus/procfs/proc_fdinfo.go

@@ -16,7 +16,7 @@ package procfs
 import (
 	"bufio"
 	"bytes"
-	"errors"
+	"fmt"
 	"regexp"
 
 	"github.com/prometheus/procfs/internal/util"
@@ -41,7 +41,7 @@ type ProcFDInfo struct {
 	Flags string
 	// Mount point ID
 	MntID string
-	// List of inotify lines (structed) in the fdinfo file (kernel 3.8+ only)
+	// List of inotify lines (structured) in the fdinfo file (kernel 3.8+ only)
 	InotifyInfos []InotifyInfo
 }
 
@@ -112,7 +112,7 @@ func parseInotifyInfo(line string) (*InotifyInfo, error) {
 		}
 		return i, nil
 	}
-	return nil, errors.New("invalid inode entry: " + line)
+	return nil, fmt.Errorf("invalid inode entry: %q", line)
 }
 
 // ProcFDInfos represents a list of ProcFDInfo structs.

vendor/github.com/prometheus/procfs/proc_limits.go

@@ -26,55 +26,55 @@ import (
 // http://man7.org/linux/man-pages/man2/getrlimit.2.html.
 type ProcLimits struct {
 	// CPU time limit in seconds.
-	CPUTime int64
+	CPUTime uint64
 	// Maximum size of files that the process may create.
-	FileSize int64
+	FileSize uint64
 	// Maximum size of the process's data segment (initialized data,
 	// uninitialized data, and heap).
-	DataSize int64
+	DataSize uint64
 	// Maximum size of the process stack in bytes.
-	StackSize int64
+	StackSize uint64
 	// Maximum size of a core file.
-	CoreFileSize int64
+	CoreFileSize uint64
 	// Limit of the process's resident set in pages.
-	ResidentSet int64
+	ResidentSet uint64
 	// Maximum number of processes that can be created for the real user ID of
 	// the calling process.
-	Processes int64
+	Processes uint64
 	// Value one greater than the maximum file descriptor number that can be
 	// opened by this process.
-	OpenFiles int64
+	OpenFiles uint64
 	// Maximum number of bytes of memory that may be locked into RAM.
-	LockedMemory int64
+	LockedMemory uint64
 	// Maximum size of the process's virtual memory address space in bytes.
-	AddressSpace int64
+	AddressSpace uint64
 	// Limit on the combined number of flock(2) locks and fcntl(2) leases that
 	// this process may establish.
-	FileLocks int64
+	FileLocks uint64
 	// Limit of signals that may be queued for the real user ID of the calling
 	// process.
-	PendingSignals int64
+	PendingSignals uint64
 	// Limit on the number of bytes that can be allocated for POSIX message
 	// queues for the real user ID of the calling process.
-	MsqqueueSize int64
+	MsqqueueSize uint64
 	// Limit of the nice priority set using setpriority(2) or nice(2).
-	NicePriority int64
+	NicePriority uint64
 	// Limit of the real-time priority set using sched_setscheduler(2) or
 	// sched_setparam(2).
-	RealtimePriority int64
+	RealtimePriority uint64
 	// Limit (in microseconds) on the amount of CPU time that a process
 	// scheduled under a real-time scheduling policy may consume without making
 	// a blocking system call.
-	RealtimeTimeout int64
+	RealtimeTimeout uint64
 }
 
 const (
-	limitsFields    = 3
+	limitsFields    = 4
 	limitsUnlimited = "unlimited"
 )
 
 var (
-	limitsDelimiter = regexp.MustCompile("  +")
+	limitsMatch = regexp.MustCompile(`(Max \w+\s{0,1}?\w*\s{0,1}\w*)\s{2,}(\w+)\s+(\w+)`)
 )
 
 // NewLimits returns the current soft limits of the process.
@@ -96,46 +96,49 @@ func (p Proc) Limits() (ProcLimits, error) {
 		l = ProcLimits{}
 		s = bufio.NewScanner(f)
 	)
+
+	s.Scan() // Skip limits header
+
 	for s.Scan() {
-		fields := limitsDelimiter.Split(s.Text(), limitsFields)
+		//fields := limitsMatch.Split(s.Text(), limitsFields)
+		fields := limitsMatch.FindStringSubmatch(s.Text())
 		if len(fields) != limitsFields {
-			return ProcLimits{}, fmt.Errorf(
-				"couldn't parse %s line %s", f.Name(), s.Text())
+			return ProcLimits{}, fmt.Errorf("couldn't parse %q line %q", f.Name(), s.Text())
 		}
 
-		switch fields[0] {
+		switch fields[1] {
 		case "Max cpu time":
-			l.CPUTime, err = parseInt(fields[1])
+			l.CPUTime, err = parseUint(fields[2])
 		case "Max file size":
-			l.FileSize, err = parseInt(fields[1])
+			l.FileSize, err = parseUint(fields[2])
 		case "Max data size":
-			l.DataSize, err = parseInt(fields[1])
+			l.DataSize, err = parseUint(fields[2])
 		case "Max stack size":
-			l.StackSize, err = parseInt(fields[1])
+			l.StackSize, err = parseUint(fields[2])
 		case "Max core file size":
-			l.CoreFileSize, err = parseInt(fields[1])
+			l.CoreFileSize, err = parseUint(fields[2])
 		case "Max resident set":
-			l.ResidentSet, err = parseInt(fields[1])
+			l.ResidentSet, err = parseUint(fields[2])
 		case "Max processes":
-			l.Processes, err = parseInt(fields[1])
+			l.Processes, err = parseUint(fields[2])
 		case "Max open files":
-			l.OpenFiles, err = parseInt(fields[1])
+			l.OpenFiles, err = parseUint(fields[2])
 		case "Max locked memory":
-			l.LockedMemory, err = parseInt(fields[1])
+			l.LockedMemory, err = parseUint(fields[2])
 		case "Max address space":
-			l.AddressSpace, err = parseInt(fields[1])
+			l.AddressSpace, err = parseUint(fields[2])
 		case "Max file locks":
-			l.FileLocks, err = parseInt(fields[1])
+			l.FileLocks, err = parseUint(fields[2])
 		case "Max pending signals":
-			l.PendingSignals, err = parseInt(fields[1])
+			l.PendingSignals, err = parseUint(fields[2])
 		case "Max msgqueue size":
-			l.MsqqueueSize, err = parseInt(fields[1])
+			l.MsqqueueSize, err = parseUint(fields[2])
 		case "Max nice priority":
-			l.NicePriority, err = parseInt(fields[1])
+			l.NicePriority, err = parseUint(fields[2])
 		case "Max realtime priority":
-			l.RealtimePriority, err = parseInt(fields[1])
+			l.RealtimePriority, err = parseUint(fields[2])
 		case "Max realtime timeout":
-			l.RealtimeTimeout, err = parseInt(fields[1])
+			l.RealtimeTimeout, err = parseUint(fields[2])
 		}
 		if err != nil {
 			return ProcLimits{}, err
@@ -145,13 +148,13 @@ func (p Proc) Limits() (ProcLimits, error) {
 	return l, s.Err()
 }
 
-func parseInt(s string) (int64, error) {
+func parseUint(s string) (uint64, error) {
 	if s == limitsUnlimited {
-		return -1, nil
+		return 18446744073709551615, nil
 	}
-	i, err := strconv.ParseInt(s, 10, 64)
+	i, err := strconv.ParseUint(s, 10, 64)
 	if err != nil {
-		return 0, fmt.Errorf("couldn't parse value %s: %s", s, err)
+		return 0, fmt.Errorf("couldn't parse value %q: %w", s, err)
 	}
 	return i, nil
 }

vendor/github.com/prometheus/procfs/proc_maps.go

@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !windows
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package procfs
 
@@ -25,6 +25,7 @@ import (
 	"golang.org/x/sys/unix"
 )
 
+// ProcMapPermissions contains permission settings read from /proc/[pid]/maps
 type ProcMapPermissions struct {
 	// mapping has the [R]ead flag set
 	Read bool

vendor/github.com/prometheus/procfs/proc_ns.go

@@ -40,7 +40,7 @@ func (p Proc) Namespaces() (Namespaces, error) {
 
 	names, err := d.Readdirnames(-1)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read contents of ns dir: %v", err)
+		return nil, fmt.Errorf("failed to read contents of ns dir: %w", err)
 	}
 
 	ns := make(Namespaces, len(names))
@@ -52,13 +52,13 @@ func (p Proc) Namespaces() (Namespaces, error) {
 
 		fields := strings.SplitN(target, ":", 2)
 		if len(fields) != 2 {
-			return nil, fmt.Errorf("failed to parse namespace type and inode from '%v'", target)
+			return nil, fmt.Errorf("failed to parse namespace type and inode from %q", target)
 		}
 
 		typ := fields[0]
 		inode, err := strconv.ParseUint(strings.Trim(fields[1], "[]"), 10, 32)
 		if err != nil {
-			return nil, fmt.Errorf("failed to parse inode from '%v': %v", fields[1], err)
+			return nil, fmt.Errorf("failed to parse inode from %q: %w", fields[1], err)
 		}
 
 		ns[name] = Namespace{typ, uint32(inode)}

vendor/github.com/prometheus/procfs/proc_psi.go

@@ -59,7 +59,7 @@ type PSIStats struct {
 func (fs FS) PSIStatsForResource(resource string) (PSIStats, error) {
 	data, err := util.ReadFileNoStat(fs.proc.Path(fmt.Sprintf("%s/%s", "pressure", resource)))
 	if err != nil {
-		return PSIStats{}, fmt.Errorf("psi_stats: unavailable for %s", resource)
+		return PSIStats{}, fmt.Errorf("psi_stats: unavailable for %q: %w", resource, err)
 	}
 
 	return parsePSIStats(resource, bytes.NewReader(data))

vendor/github.com/prometheus/procfs/proc_smaps.go

@@ -0,0 +1,165 @@
+// Copyright 2020 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 procfs
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/procfs/internal/util"
+)
+
+var (
+	// match the header line before each mapped zone in /proc/pid/smaps
+	procSMapsHeaderLine = regexp.MustCompile(`^[a-f0-9].*$`)
+)
+
+type ProcSMapsRollup struct {
+	// Amount of the mapping that is currently resident in RAM
+	Rss uint64
+	// Process's proportional share of this mapping
+	Pss uint64
+	// Size in bytes of clean shared pages
+	SharedClean uint64
+	// Size in bytes of dirty shared pages
+	SharedDirty uint64
+	// Size in bytes of clean private pages
+	PrivateClean uint64
+	// Size in bytes of dirty private pages
+	PrivateDirty uint64
+	// Amount of memory currently marked as referenced or accessed
+	Referenced uint64
+	// Amount of memory that does not belong to any file
+	Anonymous uint64
+	// Amount would-be-anonymous memory currently on swap
+	Swap uint64
+	// Process's proportional memory on swap
+	SwapPss uint64
+}
+
+// ProcSMapsRollup reads from /proc/[pid]/smaps_rollup to get summed memory information of the
+// process.
+//
+// If smaps_rollup does not exists (require kernel >= 4.15), the content of /proc/pid/smaps will
+// we read and summed.
+func (p Proc) ProcSMapsRollup() (ProcSMapsRollup, error) {
+	data, err := util.ReadFileNoStat(p.path("smaps_rollup"))
+	if err != nil && os.IsNotExist(err) {
+		return p.procSMapsRollupManual()
+	}
+	if err != nil {
+		return ProcSMapsRollup{}, err
+	}
+
+	lines := strings.Split(string(data), "\n")
+	smaps := ProcSMapsRollup{}
+
+	// skip first line which don't contains information we need
+	lines = lines[1:]
+	for _, line := range lines {
+		if line == "" {
+			continue
+		}
+
+		if err := smaps.parseLine(line); err != nil {
+			return ProcSMapsRollup{}, err
+		}
+	}
+
+	return smaps, nil
+}
+
+// Read /proc/pid/smaps and do the roll-up in Go code.
+func (p Proc) procSMapsRollupManual() (ProcSMapsRollup, error) {
+	file, err := os.Open(p.path("smaps"))
+	if err != nil {
+		return ProcSMapsRollup{}, err
+	}
+	defer file.Close()
+
+	smaps := ProcSMapsRollup{}
+	scan := bufio.NewScanner(file)
+
+	for scan.Scan() {
+		line := scan.Text()
+
+		if procSMapsHeaderLine.MatchString(line) {
+			continue
+		}
+
+		if err := smaps.parseLine(line); err != nil {
+			return ProcSMapsRollup{}, err
+		}
+	}
+
+	return smaps, nil
+}
+
+func (s *ProcSMapsRollup) parseLine(line string) error {
+	kv := strings.SplitN(line, ":", 2)
+	if len(kv) != 2 {
+		fmt.Println(line)
+		return errors.New("invalid net/dev line, missing colon")
+	}
+
+	k := kv[0]
+	if k == "VmFlags" {
+		return nil
+	}
+
+	v := strings.TrimSpace(kv[1])
+	v = strings.TrimRight(v, " kB")
+
+	vKBytes, err := strconv.ParseUint(v, 10, 64)
+	if err != nil {
+		return err
+	}
+	vBytes := vKBytes * 1024
+
+	s.addValue(k, v, vKBytes, vBytes)
+
+	return nil
+}
+
+func (s *ProcSMapsRollup) addValue(k string, vString string, vUint uint64, vUintBytes uint64) {
+	switch k {
+	case "Rss":
+		s.Rss += vUintBytes
+	case "Pss":
+		s.Pss += vUintBytes
+	case "Shared_Clean":
+		s.SharedClean += vUintBytes
+	case "Shared_Dirty":
+		s.SharedDirty += vUintBytes
+	case "Private_Clean":
+		s.PrivateClean += vUintBytes
+	case "Private_Dirty":
+		s.PrivateDirty += vUintBytes
+	case "Referenced":
+		s.Referenced += vUintBytes
+	case "Anonymous":
+		s.Anonymous += vUintBytes
+	case "Swap":
+		s.Swap += vUintBytes
+	case "SwapPss":
+		s.SwapPss += vUintBytes
+	}
+}

vendor/github.com/prometheus/procfs/proc_stat.go

@@ -100,6 +100,15 @@ type ProcStat struct {
 	VSize uint
 	// Resident set size in pages.
 	RSS int
+	// Soft limit in bytes on the rss of the process.
+	RSSLimit uint64
+	// Real-time scheduling priority, a number in the range 1 to 99 for processes
+	// scheduled under a real-time policy, or 0, for non-real-time processes.
+	RTPriority uint
+	// Scheduling policy.
+	Policy uint
+	// Aggregated block I/O delays, measured in clock ticks (centiseconds).
+	DelayAcctBlkIOTicks uint64
 
 	proc fs.FS
 }
@@ -119,7 +128,8 @@ func (p Proc) Stat() (ProcStat, error) {
 	}
 
 	var (
-		ignore int
+		ignoreInt64  int64
+		ignoreUint64 uint64
 
 		s = ProcStat{PID: p.PID, proc: p.fs}
 		l = bytes.Index(data, []byte("("))
@@ -127,10 +137,7 @@ func (p Proc) Stat() (ProcStat, error) {
 	)
 
 	if l < 0 || r < 0 {
-		return ProcStat{}, fmt.Errorf(
-			"unexpected format, couldn't extract comm: %s",
-			data,
-		)
+		return ProcStat{}, fmt.Errorf("unexpected format, couldn't extract comm %q", data)
 	}
 
 	s.Comm = string(data[l+1 : r])
@@ -154,10 +161,28 @@ func (p Proc) Stat() (ProcStat, error) {
 		&s.Priority,
 		&s.Nice,
 		&s.NumThreads,
-		&ignore,
+		&ignoreInt64,
 		&s.Starttime,
 		&s.VSize,
 		&s.RSS,
+		&s.RSSLimit,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreUint64,
+		&ignoreInt64,
+		&ignoreInt64,
+		&s.RTPriority,
+		&s.Policy,
+		&s.DelayAcctBlkIOTicks,
 	)
 	if err != nil {
 		return ProcStat{}, err

vendor/github.com/prometheus/procfs/proc_status.go

@@ -72,8 +72,10 @@ type ProcStatus struct {
 	// Number of involuntary context switches.
 	NonVoluntaryCtxtSwitches uint64
 
-	// UIDs of the process (Real, effective, saved set, and filesystem UIDs (GIDs))
+	// UIDs of the process (Real, effective, saved set, and filesystem UIDs)
 	UIDs [4]string
+	// GIDs of the process (Real, effective, saved set, and filesystem GIDs)
+	GIDs [4]string
 }
 
 // NewStatus returns the current status information of the process.
@@ -119,6 +121,8 @@ func (s *ProcStatus) fillStatus(k string, vString string, vUint uint64, vUintByt
 		s.Name = vString
 	case "Uid":
 		copy(s.UIDs[:], strings.Split(vString, "\t"))
+	case "Gid":
+		copy(s.GIDs[:], strings.Split(vString, "\t"))
 	case "VmPeak":
 		s.VmPeak = vUintBytes
 	case "VmSize":

vendor/github.com/prometheus/procfs/schedstat.go

@@ -95,24 +95,27 @@ func (fs FS) Schedstat() (*Schedstat, error) {
 	return stats, nil
 }
 
-func parseProcSchedstat(contents string) (stats ProcSchedstat, err error) {
+func parseProcSchedstat(contents string) (ProcSchedstat, error) {
+	var (
+		stats ProcSchedstat
+		err   error
+	)
 	match := procLineRE.FindStringSubmatch(contents)
 
 	if match != nil {
 		stats.RunningNanoseconds, err = strconv.ParseUint(match[1], 10, 64)
 		if err != nil {
-			return
+			return stats, err
 		}
 
 		stats.WaitingNanoseconds, err = strconv.ParseUint(match[2], 10, 64)
 		if err != nil {
-			return
+			return stats, err
 		}
 
 		stats.RunTimeslices, err = strconv.ParseUint(match[3], 10, 64)
-		return
+		return stats, err
 	}
 
-	err = errors.New("could not parse schedstat")
-	return
+	return stats, errors.New("could not parse schedstat")
 }

vendor/github.com/prometheus/procfs/slab.go

@@ -0,0 +1,151 @@
+// Copyright 2020 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"
+	"bytes"
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/procfs/internal/util"
+)
+
+var (
+	slabSpace  = regexp.MustCompile(`\s+`)
+	slabVer    = regexp.MustCompile(`slabinfo -`)
+	slabHeader = regexp.MustCompile(`# name`)
+)
+
+// Slab represents a slab pool in the kernel.
+type Slab struct {
+	Name         string
+	ObjActive    int64
+	ObjNum       int64
+	ObjSize      int64
+	ObjPerSlab   int64
+	PagesPerSlab int64
+	// tunables
+	Limit        int64
+	Batch        int64
+	SharedFactor int64
+	SlabActive   int64
+	SlabNum      int64
+	SharedAvail  int64
+}
+
+// SlabInfo represents info for all slabs.
+type SlabInfo struct {
+	Slabs []*Slab
+}
+
+func shouldParseSlab(line string) bool {
+	if slabVer.MatchString(line) {
+		return false
+	}
+	if slabHeader.MatchString(line) {
+		return false
+	}
+	return true
+}
+
+// parseV21SlabEntry is used to parse a line from /proc/slabinfo version 2.1.
+func parseV21SlabEntry(line string) (*Slab, error) {
+	// First cleanup whitespace.
+	l := slabSpace.ReplaceAllString(line, " ")
+	s := strings.Split(l, " ")
+	if len(s) != 16 {
+		return nil, fmt.Errorf("unable to parse: %q", line)
+	}
+	var err error
+	i := &Slab{Name: s[0]}
+	i.ObjActive, err = strconv.ParseInt(s[1], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.ObjNum, err = strconv.ParseInt(s[2], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.ObjSize, err = strconv.ParseInt(s[3], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.ObjPerSlab, err = strconv.ParseInt(s[4], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.PagesPerSlab, err = strconv.ParseInt(s[5], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.Limit, err = strconv.ParseInt(s[8], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.Batch, err = strconv.ParseInt(s[9], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.SharedFactor, err = strconv.ParseInt(s[10], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.SlabActive, err = strconv.ParseInt(s[13], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.SlabNum, err = strconv.ParseInt(s[14], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	i.SharedAvail, err = strconv.ParseInt(s[15], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	return i, nil
+}
+
+// parseSlabInfo21 is used to parse a slabinfo 2.1 file.
+func parseSlabInfo21(r *bytes.Reader) (SlabInfo, error) {
+	scanner := bufio.NewScanner(r)
+	s := SlabInfo{Slabs: []*Slab{}}
+	for scanner.Scan() {
+		line := scanner.Text()
+		if !shouldParseSlab(line) {
+			continue
+		}
+		slab, err := parseV21SlabEntry(line)
+		if err != nil {
+			return s, err
+		}
+		s.Slabs = append(s.Slabs, slab)
+	}
+	return s, nil
+}
+
+// SlabInfo reads data from /proc/slabinfo
+func (fs FS) SlabInfo() (SlabInfo, error) {
+	// TODO: Consider passing options to allow for parsing different
+	// slabinfo versions. However, slabinfo 2.1 has been stable since
+	// kernel 2.6.10 and later.
+	data, err := util.ReadFileNoStat(fs.proc.Path("slabinfo"))
+	if err != nil {
+		return SlabInfo{}, err
+	}
+
+	return parseSlabInfo21(bytes.NewReader(data))
+}

vendor/github.com/prometheus/procfs/stat.go

@@ -93,10 +93,10 @@ func parseCPUStat(line string) (CPUStat, int64, error) {
 		&cpuStat.Guest, &cpuStat.GuestNice)
 
 	if err != nil && err != io.EOF {
-		return CPUStat{}, -1, fmt.Errorf("couldn't parse %s (cpu): %s", line, err)
+		return CPUStat{}, -1, fmt.Errorf("couldn't parse %q (cpu): %w", line, err)
 	}
 	if count == 0 {
-		return CPUStat{}, -1, fmt.Errorf("couldn't parse %s (cpu): 0 elements parsed", line)
+		return CPUStat{}, -1, fmt.Errorf("couldn't parse %q (cpu): 0 elements parsed", line)
 	}
 
 	cpuStat.User /= userHZ
@@ -116,7 +116,7 @@ func parseCPUStat(line string) (CPUStat, int64, error) {
 
 	cpuID, err := strconv.ParseInt(cpu[3:], 10, 64)
 	if err != nil {
-		return CPUStat{}, -1, fmt.Errorf("couldn't parse %s (cpu/cpuid): %s", line, err)
+		return CPUStat{}, -1, fmt.Errorf("couldn't parse %q (cpu/cpuid): %w", line, err)
 	}
 
 	return cpuStat, cpuID, nil
@@ -136,7 +136,7 @@ func parseSoftIRQStat(line string) (SoftIRQStat, uint64, error) {
 		&softIRQStat.Hrtimer, &softIRQStat.Rcu)
 
 	if err != nil {
-		return SoftIRQStat{}, 0, fmt.Errorf("couldn't parse %s (softirq): %s", line, err)
+		return SoftIRQStat{}, 0, fmt.Errorf("couldn't parse %q (softirq): %w", line, err)
 	}
 
 	return softIRQStat, total, nil
@@ -184,34 +184,34 @@ func (fs FS) Stat() (Stat, error) {
 		switch {
 		case parts[0] == "btime":
 			if stat.BootTime, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
-				return Stat{}, fmt.Errorf("couldn't parse %s (btime): %s", parts[1], err)
+				return Stat{}, fmt.Errorf("couldn't parse %q (btime): %w", parts[1], err)
 			}
 		case parts[0] == "intr":
 			if stat.IRQTotal, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
-				return Stat{}, fmt.Errorf("couldn't parse %s (intr): %s", parts[1], err)
+				return Stat{}, fmt.Errorf("couldn't parse %q (intr): %w", parts[1], err)
 			}
 			numberedIRQs := parts[2:]
 			stat.IRQ = make([]uint64, len(numberedIRQs))
 			for i, count := range numberedIRQs {
 				if stat.IRQ[i], err = strconv.ParseUint(count, 10, 64); err != nil {
-					return Stat{}, fmt.Errorf("couldn't parse %s (intr%d): %s", count, i, err)
+					return Stat{}, fmt.Errorf("couldn't parse %q (intr%d): %w", count, i, err)
 				}
 			}
 		case parts[0] == "ctxt":
 			if stat.ContextSwitches, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
-				return Stat{}, fmt.Errorf("couldn't parse %s (ctxt): %s", parts[1], err)
+				return Stat{}, fmt.Errorf("couldn't parse %q (ctxt): %w", parts[1], err)
 			}
 		case parts[0] == "processes":
 			if stat.ProcessCreated, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
-				return Stat{}, fmt.Errorf("couldn't parse %s (processes): %s", parts[1], err)
+				return Stat{}, fmt.Errorf("couldn't parse %q (processes): %w", parts[1], err)
 			}
 		case parts[0] == "procs_running":
 			if stat.ProcessesRunning, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
-				return Stat{}, fmt.Errorf("couldn't parse %s (procs_running): %s", parts[1], err)
+				return Stat{}, fmt.Errorf("couldn't parse %q (procs_running): %w", parts[1], err)
 			}
 		case parts[0] == "procs_blocked":
 			if stat.ProcessesBlocked, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
-				return Stat{}, fmt.Errorf("couldn't parse %s (procs_blocked): %s", parts[1], err)
+				return Stat{}, fmt.Errorf("couldn't parse %q (procs_blocked): %w", parts[1], err)
 			}
 		case parts[0] == "softirq":
 			softIRQStats, total, err := parseSoftIRQStat(line)
@@ -237,7 +237,7 @@ func (fs FS) Stat() (Stat, error) {
 	}
 
 	if err := scanner.Err(); err != nil {
-		return Stat{}, fmt.Errorf("couldn't parse %s: %s", fileName, err)
+		return Stat{}, fmt.Errorf("couldn't parse %q: %w", fileName, err)
 	}
 
 	return stat, nil

vendor/github.com/prometheus/procfs/xfrm.go

@@ -112,8 +112,7 @@ func (fs FS) NewXfrmStat() (XfrmStat, error) {
 		fields := strings.Fields(s.Text())
 
 		if len(fields) != 2 {
-			return XfrmStat{}, fmt.Errorf(
-				"couldn't parse %s line %s", file.Name(), s.Text())
+			return XfrmStat{}, fmt.Errorf("couldn't parse %q line %q", file.Name(), s.Text())
 		}
 
 		name := fields[0]

vendor/github.com/prometheus/procfs/zoneinfo.go

@@ -74,11 +74,11 @@ var nodeZoneRE = regexp.MustCompile(`(\d+), zone\s+(\w+)`)
 func (fs FS) Zoneinfo() ([]Zoneinfo, error) {
 	data, err := ioutil.ReadFile(fs.proc.Path("zoneinfo"))
 	if err != nil {
-		return nil, fmt.Errorf("error reading zoneinfo %s: %s", fs.proc.Path("zoneinfo"), err)
+		return nil, fmt.Errorf("error reading zoneinfo %q: %w", fs.proc.Path("zoneinfo"), err)
 	}
 	zoneinfo, err := parseZoneinfo(data)
 	if err != nil {
-		return nil, fmt.Errorf("error parsing zoneinfo %s: %s", fs.proc.Path("zoneinfo"), err)
+		return nil, fmt.Errorf("error parsing zoneinfo %q: %w", fs.proc.Path("zoneinfo"), err)
 	}
 	return zoneinfo, nil
 }
@@ -99,7 +99,6 @@ func parseZoneinfo(zoneinfoData []byte) ([]Zoneinfo, error) {
 				continue
 			}
 			if strings.HasPrefix(strings.TrimSpace(line), "per-node stats") {
-				zoneinfoElement.Zone = ""
 				continue
 			}
 			parts := strings.Fields(strings.TrimSpace(line))

vendor/modules.txt

@@ -185,7 +185,7 @@ github.com/prometheus/client_model/go
 github.com/prometheus/common/expfmt
 github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg
 github.com/prometheus/common/model
-# github.com/prometheus/procfs v0.7.3 => github.com/prometheus/procfs v0.0.11
+# github.com/prometheus/procfs v0.7.3
 github.com/prometheus/procfs
 github.com/prometheus/procfs/internal/fs
 github.com/prometheus/procfs/internal/util
@@ -364,4 +364,3 @@ gotest.tools/v3/skip
 # github.com/docker/docker => github.com/docker/docker v20.10.3-0.20220309172631-83b51522df43+incompatible
 # github.com/gogo/googleapis => github.com/gogo/googleapis v1.3.2
 # github.com/prometheus/client_golang => github.com/prometheus/client_golang v1.6.0
-# github.com/prometheus/procfs => github.com/prometheus/procfs v0.0.11