Add basic prometheus support

This adds a metrics packages that creates additional metrics.  Add the
metrics endpoint to the docker api server under `/metrics`.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Add metrics to daemon package

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

api: use standard way for metrics route

Also add "type" query parameter

Signed-off-by: Alexander Morozov <lk4d4@docker.com>

Convert timers to ms

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

cmd/dockerd/daemon.go

@@ -248,6 +248,15 @@ func (cli *DaemonCli) start(opts daemonOptions) (err error) {
 		return fmt.Errorf("Error starting daemon: %v", err)
 	}
 
+	if cli.Config.MetricsAddress != "" {
+		if !d.HasExperimental() {
+			return fmt.Errorf("metrics-addr is only supported when experimental is enabled")
+		}
+		if err := startMetricsServer(cli.Config.MetricsAddress); err != nil {
+			return err
+		}
+	}
+
 	name, _ := os.Hostname()
 
 	c, err := cluster.New(cluster.Config{

cmd/dockerd/metrics.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"net"
+	"net/http"
+
+	"github.com/Sirupsen/logrus"
+	metrics "github.com/docker/go-metrics"
+)
+
+func startMetricsServer(addr string) error {
+	if err := allocateDaemonPort(addr); err != nil {
+		return err
+	}
+	l, err := net.Listen("tcp", addr)
+	if err != nil {
+		return err
+	}
+	mux := http.NewServeMux()
+	mux.Handle("/metrics", metrics.Handler())
+	go func() {
+		if err := http.Serve(l, mux); err != nil {
+			logrus.Errorf("serve metrics api: %s", err)
+		}
+	}()
+	return nil
+}

daemon/changes.go

@@ -1,9 +1,14 @@
 package daemon
 
-import "github.com/docker/docker/pkg/archive"
+import (
+	"time"
+
+	"github.com/docker/docker/pkg/archive"
+)
 
 // ContainerChanges returns a list of container fs changes
 func (daemon *Daemon) ContainerChanges(name string) ([]archive.Change, error) {
+	start := time.Now()
 	container, err := daemon.GetContainer(name)
 	if err != nil {
 		return nil, err
@@ -11,5 +16,10 @@ func (daemon *Daemon) ContainerChanges(name string) ([]archive.Change, error) {
 
 	container.Lock()
 	defer container.Unlock()
-	return container.RWLayer.Changes()
+	c, err := container.RWLayer.Changes()
+	if err != nil {
+		return nil, err
+	}
+	containerActions.WithValues("changes").UpdateSince(start)
+	return c, nil
 }

daemon/commit.go

@@ -120,6 +120,7 @@ func merge(userConf, imageConf *containertypes.Config) error {
 // Commit creates a new filesystem image from the current state of a container.
 // The image can optionally be tagged into a repository.
 func (daemon *Daemon) Commit(name string, c *backend.ContainerCommitConfig) (string, error) {
+	start := time.Now()
 	container, err := daemon.GetContainer(name)
 	if err != nil {
 		return "", err
@@ -244,6 +245,7 @@ func (daemon *Daemon) Commit(name string, c *backend.ContainerCommitConfig) (str
 		"comment": c.Comment,
 	}
 	daemon.LogContainerEventWithAttributes(container, "commit", attributes)
+	containerActions.WithValues("commit").UpdateSince(start)
 	return id.String(), nil
 }
 

daemon/config.go

@@ -146,6 +146,7 @@ type CommonConfig struct {
 	// given to the /swarm/init endpoint and no advertise address is
 	// specified.
 	SwarmDefaultAdvertiseAddr string `json:"swarm-default-advertise-addr"`
+	MetricsAddress            string `json:"metrics-addr"`
 
 	LogConfig
 	bridgeConfig // bridgeConfig holds bridge network specific configuration.
@@ -191,6 +192,8 @@ func (config *Config) InstallCommonFlags(flags *pflag.FlagSet) {
 	flags.StringVar(&config.SwarmDefaultAdvertiseAddr, "swarm-default-advertise-addr", "", "Set default address or interface for swarm advertised address")
 	flags.BoolVar(&config.Experimental, "experimental", false, "Enable experimental features")
 
+	flags.StringVar(&config.MetricsAddress, "metrics-addr", "", "Set default address and port to serve the metrics api on")
+
 	config.MaxConcurrentDownloads = &maxConcurrentDownloads
 	config.MaxConcurrentUploads = &maxConcurrentUploads
 }

daemon/container_operations.go

@@ -8,6 +8,7 @@ import (
 	"path"
 	"runtime"
 	"strings"
+	"time"
 
 	"github.com/Sirupsen/logrus"
 	derr "github.com/docker/docker/api/errors"
@@ -284,8 +285,11 @@ func (daemon *Daemon) updateEndpointNetworkSettings(container *container.Contain
 // UpdateNetwork is used to update the container's network (e.g. when linked containers
 // get removed/unlinked).
 func (daemon *Daemon) updateNetwork(container *container.Container) error {
-	ctrl := daemon.netController
+	var (
-	sid := container.NetworkSettings.SandboxID
+		start = time.Now()
+		ctrl  = daemon.netController
+		sid   = container.NetworkSettings.SandboxID
+	)
 
 	sb, err := ctrl.SandboxByID(sid)
 	if err != nil {
@@ -319,6 +323,8 @@ func (daemon *Daemon) updateNetwork(container *container.Container) error {
 		return fmt.Errorf("Update network failed: Failure in refresh sandbox %s: %v", sid, err)
 	}
 
+	networkActions.WithValues("update").UpdateSince(start)
+
 	return nil
 }
 
@@ -452,6 +458,7 @@ func (daemon *Daemon) updateContainerNetworkSettings(container *container.Contai
 }
 
 func (daemon *Daemon) allocateNetwork(container *container.Container) error {
+	start := time.Now()
 	controller := daemon.netController
 
 	if daemon.netController == nil {
@@ -503,7 +510,11 @@ func (daemon *Daemon) allocateNetwork(container *container.Container) error {
 		}
 	}
 
-	return container.WriteHostConfig()
+	if err := container.WriteHostConfig(); err != nil {
+		return err
+	}
+	networkActions.WithValues("allocate").UpdateSince(start)
+	return nil
 }
 
 func (daemon *Daemon) getNetworkSandbox(container *container.Container) libnetwork.Sandbox {
@@ -613,16 +624,15 @@ func (daemon *Daemon) updateNetworkConfig(container *container.Container, n libn
 }
 
 func (daemon *Daemon) connectToNetwork(container *container.Container, idOrName string, endpointConfig *networktypes.EndpointSettings, updateSettings bool) (err error) {
+	start := time.Now()
 	if container.HostConfig.NetworkMode.IsContainer() {
 		return runconfig.ErrConflictSharedNetwork
 	}
-
 	if containertypes.NetworkMode(idOrName).IsBridge() &&
 		daemon.configStore.DisableBridge {
 		container.Config.NetworkDisabled = true
 		return nil
 	}
-
 	if endpointConfig == nil {
 		endpointConfig = &networktypes.EndpointSettings{}
 	}
@@ -714,6 +724,7 @@ func (daemon *Daemon) connectToNetwork(container *container.Container, idOrName
 	container.NetworkSettings.Ports = getPortMapInfo(sb)
 
 	daemon.LogNetworkEventWithAttributes(n, "connect", map[string]string{"container": container.ID})
+	networkActions.WithValues("connect").UpdateSince(start)
 	return nil
 }
 
@@ -835,6 +846,7 @@ func (daemon *Daemon) getNetworkedContainer(containerID, connectedContainerID st
 }
 
 func (daemon *Daemon) releaseNetwork(container *container.Container) {
+	start := time.Now()
 	if daemon.netController == nil {
 		return
 	}
@@ -885,6 +897,7 @@ func (daemon *Daemon) releaseNetwork(container *container.Container) {
 		}
 		daemon.LogNetworkEventWithAttributes(nw, "disconnect", attributes)
 	}
+	networkActions.WithValues("release").UpdateSince(start)
 }
 
 func errRemovalContainer(containerID string) error {

daemon/create.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net"
 	"strings"
+	"time"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/docker/api/errors"
@@ -31,6 +32,7 @@ func (daemon *Daemon) ContainerCreate(params types.ContainerCreateConfig, valida
 }
 
 func (daemon *Daemon) containerCreate(params types.ContainerCreateConfig, managed bool, validateHostname bool) (types.ContainerCreateResponse, error) {
+	start := time.Now()
 	if params.Config == nil {
 		return types.ContainerCreateResponse{}, fmt.Errorf("Config cannot be empty in order to create a container")
 	}
@@ -57,7 +59,7 @@ func (daemon *Daemon) containerCreate(params types.ContainerCreateConfig, manage
 	if err != nil {
 		return types.ContainerCreateResponse{Warnings: warnings}, daemon.imageNotExistToErrcode(err)
 	}
-
+	containerActions.WithValues("create").UpdateSince(start)
 	return types.ContainerCreateResponse{ID: container.ID, Warnings: warnings}, nil
 }
 

daemon/daemon.go

@@ -28,6 +28,7 @@ import (
 	"github.com/docker/docker/container"
 	"github.com/docker/docker/daemon/events"
 	"github.com/docker/docker/daemon/exec"
+	"github.com/docker/docker/dockerversion"
 	"github.com/docker/libnetwork/cluster"
 	// register graph drivers
 	_ "github.com/docker/docker/daemon/graphdriver/register"
@@ -684,12 +685,25 @@ func NewDaemon(config *Config, registryService registry.Service, containerdRemot
 		return nil, err
 	}
 
+	// FIXME: this method never returns an error
+	info, _ := d.SystemInfo()
+
+	engineVersion.WithValues(
+		dockerversion.Version,
+		dockerversion.GitCommit,
+		info.Architecture,
+		info.Driver,
+		info.KernelVersion,
+		info.OperatingSystem,
+	).Set(1)
+	engineCpus.Set(float64(info.NCPU))
+	engineMemory.Set(float64(info.MemTotal))
+
 	return d, nil
 }
 
 func (daemon *Daemon) shutdownContainer(c *container.Container) error {
 	stopTimeout := c.StopTimeout()
-
 	// TODO(windows): Handle docker restart with paused containers
 	if c.IsPaused() {
 		// To terminate a process in freezer cgroup, we should send

daemon/delete.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path"
 	"strings"
+	"time"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/docker/api/errors"
@@ -19,6 +20,7 @@ import (
 // fails. If the remove succeeds, the container name is released, and
 // network links are removed.
 func (daemon *Daemon) ContainerRm(name string, config *types.ContainerRmConfig) error {
+	start := time.Now()
 	container, err := daemon.GetContainer(name)
 	if err != nil {
 		return err
@@ -40,7 +42,10 @@ func (daemon *Daemon) ContainerRm(name string, config *types.ContainerRmConfig)
 		return daemon.rmLink(container, name)
 	}
 
-	return daemon.cleanupContainer(container, config.ForceRemove, config.RemoveVolume)
+	err = daemon.cleanupContainer(container, config.ForceRemove, config.RemoveVolume)
+	containerActions.WithValues("delete").UpdateSince(start)
+
+	return err
 }
 
 func (daemon *Daemon) rmLink(container *container.Container, name string) error {

daemon/events/events.go

@@ -33,6 +33,7 @@ func New() *Events {
 // of interface{}, so you need type assertion), and a function to call
 // to stop the stream of events.
 func (e *Events) Subscribe() ([]eventtypes.Message, chan interface{}, func()) {
+	eventSubscribers.Inc()
 	e.mu.Lock()
 	current := make([]eventtypes.Message, len(e.events))
 	copy(current, e.events)
@@ -49,6 +50,7 @@ func (e *Events) Subscribe() ([]eventtypes.Message, chan interface{}, func()) {
 // last events, a channel in which you can expect new events (in form
 // of interface{}, so you need type assertion).
 func (e *Events) SubscribeTopic(since, until time.Time, ef *Filter) ([]eventtypes.Message, chan interface{}) {
+	eventSubscribers.Inc()
 	e.mu.Lock()
 
 	var topic func(m interface{}) bool
@@ -72,12 +74,14 @@ func (e *Events) SubscribeTopic(since, until time.Time, ef *Filter) ([]eventtype
 
 // Evict evicts listener from pubsub
 func (e *Events) Evict(l chan interface{}) {
+	eventSubscribers.Dec()
 	e.pub.Evict(l)
 }
 
 // Log broadcasts event to listeners. Each listener has 100 millisecond for
 // receiving event or it will be skipped.
 func (e *Events) Log(action, eventType string, actor eventtypes.Actor) {
+	eventsCounter.Inc()
 	now := time.Now().UTC()
 	jm := eventtypes.Message{
 		Action:   action,

daemon/events/metrics.go

@@ -0,0 +1,15 @@
+package events
+
+import "github.com/docker/go-metrics"
+
+var (
+	eventsCounter    metrics.Counter
+	eventSubscribers metrics.Gauge
+)
+
+func init() {
+	ns := metrics.NewNamespace("engine", "daemon", nil)
+	eventsCounter = ns.NewCounter("events", "The number of events logged")
+	eventSubscribers = ns.NewGauge("events_subscribers", "The number of current subscribers to events", metrics.Total)
+	metrics.Register(ns)
+}

daemon/health.go

@@ -60,6 +60,7 @@ type cmdProbe struct {
 // exec the healthcheck command in the container.
 // Returns the exit code and probe output (if any)
 func (p *cmdProbe) run(ctx context.Context, d *Daemon, container *container.Container) (*types.HealthcheckResult, error) {
+
 	cmdSlice := strslice.StrSlice(container.Config.Healthcheck.Test)[1:]
 	if p.shell {
 		if runtime.GOOS != "windows" {
@@ -157,8 +158,10 @@ func monitor(d *Daemon, c *container.Container, stop chan struct{}, probe probe)
 			ctx, cancelProbe := context.WithTimeout(context.Background(), probeTimeout)
 			results := make(chan *types.HealthcheckResult)
 			go func() {
+				healthChecksCounter.Inc()
 				result, err := probe.run(ctx, d, c)
 				if err != nil {
+					healthChecksFailedCounter.Inc()
 					logrus.Warnf("Health check for container %s error: %v", c.ID, err)
 					results <- &types.HealthcheckResult{
 						ExitCode: -1,

daemon/image_delete.go

@@ -3,6 +3,7 @@ package daemon
 import (
 	"fmt"
 	"strings"
+	"time"
 
 	"github.com/docker/docker/api/errors"
 	"github.com/docker/docker/api/types"
@@ -61,6 +62,7 @@ const (
 // package. This would require that we no longer need the daemon to determine
 // whether images are being used by a stopped or running container.
 func (daemon *Daemon) ImageDelete(imageRef string, force, prune bool) ([]types.ImageDelete, error) {
+	start := time.Now()
 	records := []types.ImageDelete{}
 
 	imgID, err := daemon.GetImageID(imageRef)
@@ -168,7 +170,13 @@ func (daemon *Daemon) ImageDelete(imageRef string, force, prune bool) ([]types.I
 		}
 	}
 
-	return records, daemon.imageDeleteHelper(imgID, &records, force, prune, removedRepositoryRef)
+	if err := daemon.imageDeleteHelper(imgID, &records, force, prune, removedRepositoryRef); err != nil {
+		return nil, err
+	}
+
+	imageActions.WithValues("delete").UpdateSince(start)
+
+	return records, nil
 }
 
 // isSingleReference returns true when all references are from one repository

daemon/image_history.go

@@ -2,6 +2,7 @@ package daemon
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/layer"
@@ -11,6 +12,7 @@ import (
 // ImageHistory returns a slice of ImageHistory structures for the specified image
 // name by walking the image lineage.
 func (daemon *Daemon) ImageHistory(name string) ([]*types.ImageHistory, error) {
+	start := time.Now()
 	img, err := daemon.GetImage(name)
 	if err != nil {
 		return nil, err
@@ -77,6 +79,6 @@ func (daemon *Daemon) ImageHistory(name string) ([]*types.ImageHistory, error) {
 			break
 		}
 	}
-
+	imageActions.WithValues("history").UpdateSince(start)
 	return history, nil
 }

daemon/list.go

@@ -165,7 +165,9 @@ func (daemon *Daemon) filterByNameIDMatches(ctx *listContext) []*container.Conta
 
 // reduceContainers parses the user's filtering options and generates the list of containers to return based on a reducer.
 func (daemon *Daemon) reduceContainers(config *types.ContainerListOptions, reducer containerReducer) ([]*types.Container, error) {
-	containers := []*types.Container{}
+	var (
+		containers = []*types.Container{}
+	)
 
 	ctx, err := daemon.foldFilter(config)
 	if err != nil {
@@ -190,6 +192,7 @@ func (daemon *Daemon) reduceContainers(config *types.ContainerListOptions, reduc
 			ctx.idx++
 		}
 	}
+
 	return containers, nil
 }
 

daemon/metrics.go

@@ -0,0 +1,42 @@
+package daemon
+
+import "github.com/docker/go-metrics"
+
+var (
+	containerActions          metrics.LabeledTimer
+	imageActions              metrics.LabeledTimer
+	networkActions            metrics.LabeledTimer
+	engineVersion             metrics.LabeledGauge
+	engineCpus                metrics.Gauge
+	engineMemory              metrics.Gauge
+	healthChecksCounter       metrics.Counter
+	healthChecksFailedCounter metrics.Counter
+)
+
+func init() {
+	ns := metrics.NewNamespace("engine", "daemon", nil)
+	containerActions = ns.NewLabeledTimer("container_actions", "The number of seconds it takes to process each container action", "action")
+	for _, a := range []string{
+		"start",
+		"changes",
+		"commit",
+		"create",
+		"delete",
+	} {
+		containerActions.WithValues(a).Update(0)
+	}
+	networkActions = ns.NewLabeledTimer("network_actions", "The number of seconds it takes to process each network action", "action")
+	engineVersion = ns.NewLabeledGauge("engine", "The version and commit information for the engine process", metrics.Unit("info"),
+		"version",
+		"commit",
+		"architecture",
+		"graph_driver", "kernel",
+		"os",
+	)
+	engineCpus = ns.NewGauge("engine_cpus", "The number of cpus that the host system of the engine has", metrics.Unit("cpus"))
+	engineMemory = ns.NewGauge("engine_memory", "The number of bytes of memory that the host system of the engine has", metrics.Bytes)
+	healthChecksCounter = ns.NewCounter("health_checks", "The total number of health checks")
+	healthChecksFailedCounter = ns.NewCounter("health_checks_failed", "The total number of failed health checks")
+	imageActions = ns.NewLabeledTimer("image_actions", "The number of seconds it takes to process each image action", "action")
+	metrics.Register(ns)
+}

daemon/network.go

@@ -292,6 +292,7 @@ func (daemon *Daemon) createNetwork(create types.NetworkCreateRequest, id string
 	}
 
 	daemon.LogNetworkEvent(n, "create")
+
 	return &types.NetworkCreateResponse{
 		ID:      n.ID(),
 		Warning: warning,

daemon/start.go

@@ -6,6 +6,7 @@ import (
 	"runtime"
 	"strings"
 	"syscall"
+	"time"
 
 	"google.golang.org/grpc"
 
@@ -90,6 +91,7 @@ func (daemon *Daemon) Start(container *container.Container) error {
 // between containers. The container is left waiting for a signal to
 // begin running.
 func (daemon *Daemon) containerStart(container *container.Container, checkpoint string, resetRestartManager bool) (err error) {
+	start := time.Now()
 	container.Lock()
 	defer container.Unlock()
 
@@ -177,6 +179,8 @@ func (daemon *Daemon) containerStart(container *container.Container, checkpoint
 		return fmt.Errorf("%s", errDesc)
 	}
 
+	containerActions.WithValues("start").UpdateSince(start)
+
 	return nil
 }
 

hack/vendor.sh

@@ -175,4 +175,7 @@ clone git github.com/spf13/pflag dabebe21bf790f782ea4c7bbd2efc430de182afd
 clone git github.com/inconshreveable/mousetrap 76626ae9c91c4f2a10f34cad8ce83ea42c93bb75
 clone git github.com/flynn-archive/go-shlex 3f9db97f856818214da2e1057f8ad84803971cff
 
+# metrics
+clone git github.com/docker/go-metrics 86138d05f285fd9737a99bee2d9be30866b59d72
+
 clean

integration-cli/docker_cli_external_graphdriver_unix_test.go

@@ -379,7 +379,7 @@ func (s *DockerExternalGraphdriverSuite) testExternalGraphDriver(name string, ex
 	c.Assert(s.ec[ext].removals >= 1, check.Equals, true)
 	c.Assert(s.ec[ext].gets >= 1, check.Equals, true)
 	c.Assert(s.ec[ext].puts >= 1, check.Equals, true)
-	c.Assert(s.ec[ext].stats, check.Equals, 3)
+	c.Assert(s.ec[ext].stats, check.Equals, 5)
 	c.Assert(s.ec[ext].cleanups, check.Equals, 2)
 	c.Assert(s.ec[ext].applydiff >= 1, check.Equals, true)
 	c.Assert(s.ec[ext].changes, check.Equals, 1)

vendor/src/github.com/docker/go-metrics/CONTRIBUTING.md

@@ -0,0 +1,55 @@
+# Contributing
+
+## Sign your work
+
+The sign-off is a simple line at the end of the explanation for the patch. Your
+signature certifies that you wrote the patch or otherwise have the right to pass
+it on as an open-source patch. The rules are pretty simple: if you can certify
+the below (from [developercertificate.org](http://developercertificate.org/)):
+
+```
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+660 York Street, Suite 102,
+San Francisco, CA 94110 USA
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
+```
+
+Then you just add a line to every git commit message:
+
+    Signed-off-by: Joe Smith <joe.smith@email.com>
+
+Use your real name (sorry, no pseudonyms or anonymous contributions.)
+
+If you set your `user.name` and `user.email` git configs, you can sign your
+commit automatically with `git commit -s`.

vendor/src/github.com/docker/go-metrics/LICENSE.code

@@ -0,0 +1,191 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        https://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
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vendor/src/github.com/docker/go-metrics/LICENSE.docs

@@ -0,0 +1,425 @@
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vendor/src/github.com/docker/go-metrics/NOTICE

@@ -0,0 +1,16 @@
+Docker
+Copyright 2012-2015 Docker, Inc.
+
+This product includes software developed at Docker, Inc. (https://www.docker.com).
+
+The following is courtesy of our legal counsel:
+
+
+Use and transfer of Docker may be subject to certain restrictions by the
+United States and other governments.
+It is your responsibility to ensure that your use and/or transfer does not
+violate applicable laws.
+
+For more information, please see https://www.bis.doc.gov
+
+See also https://www.apache.org/dev/crypto.html and/or seek legal counsel.

vendor/src/github.com/docker/go-metrics/README.md

@@ -0,0 +1,22 @@
+# go-metrics [![GoDoc](https://godoc.org/github.com/docker/go-metrics?status.svg)](https://godoc.org/github.com/docker/go-metrics) ![Badge Badge](http://doyouevenbadge.com/github.com/docker/go-metrics)
+
+This package is small wrapper around the prometheus go client to help enforce convention and best practices for metrics collection in Docker projects.
+
+## Status
+
+This project is a work in progress.
+It is under heavy development and not intended to be used.
+
+## Docs
+
+Package documentation can be found [here](https://godoc.org/github.com/docker/go-metrics).
+
+## Additional Metrics
+
+Additional metrics are also defined here that are not avaliable in the prometheus client.
+If you need a custom metrics and it is generic enough to be used by multiple projects, define it here.
+
+
+## Copyright and license
+
+Copyright © 2016 Docker, Inc. All rights reserved, except as follows. Code is released under the Apache 2.0 license. The README.md file, and files in the "docs" folder are licensed under the Creative Commons Attribution 4.0 International License under the terms and conditions set forth in the file "LICENSE.docs". You may obtain a duplicate copy of the same license, titled CC-BY-SA-4.0, at http://creativecommons.org/licenses/by/4.0/.

vendor/src/github.com/docker/go-metrics/counter.go

@@ -0,0 +1,52 @@
+package metrics
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// Counter is a metrics that can only increment its current count
+type Counter interface {
+	// Inc adds Sum(vs) to the counter. Sum(vs) must be positive.
+	//
+	// If len(vs) == 0, increments the counter by 1.
+	Inc(vs ...float64)
+}
+
+// LabeledCounter is counter that must have labels populated before use.
+type LabeledCounter interface {
+	WithValues(vs ...string) Counter
+}
+
+type labeledCounter struct {
+	pc *prometheus.CounterVec
+}
+
+func (lc *labeledCounter) WithValues(vs ...string) Counter {
+	return &counter{pc: lc.pc.WithLabelValues(vs...)}
+}
+
+func (lc *labeledCounter) Describe(ch chan<- *prometheus.Desc) {
+	lc.pc.Describe(ch)
+}
+
+func (lc *labeledCounter) Collect(ch chan<- prometheus.Metric) {
+	lc.pc.Collect(ch)
+}
+
+type counter struct {
+	pc prometheus.Counter
+}
+
+func (c *counter) Inc(vs ...float64) {
+	if len(vs) == 0 {
+		c.pc.Inc()
+	}
+
+	c.pc.Add(sumFloat64(vs...))
+}
+
+func (c *counter) Describe(ch chan<- *prometheus.Desc) {
+	c.pc.Describe(ch)
+}
+
+func (c *counter) Collect(ch chan<- prometheus.Metric) {
+	c.pc.Collect(ch)
+}

vendor/src/github.com/docker/go-metrics/docs.go

@@ -0,0 +1,3 @@
+// This package is small wrapper around the prometheus go client to help enforce convention and best practices for metrics collection in Docker projects.
+
+package metrics

vendor/src/github.com/docker/go-metrics/gauge.go

@@ -0,0 +1,72 @@
+package metrics
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// Gauge is a metric that allows incrementing and decrementing a value
+type Gauge interface {
+	Inc(...float64)
+	Dec(...float64)
+
+	// Add adds the provided value to the gauge's current value
+	Add(float64)
+
+	// Set replaces the gauge's current value with the provided value
+	Set(float64)
+}
+
+// LabeledGauge describes a gauge the must have values populated before use.
+type LabeledGauge interface {
+	WithValues(labels ...string) Gauge
+}
+
+type labeledGauge struct {
+	pg *prometheus.GaugeVec
+}
+
+func (lg *labeledGauge) WithValues(labels ...string) Gauge {
+	return &gauge{pg: lg.pg.WithLabelValues(labels...)}
+}
+
+func (lg *labeledGauge) Describe(c chan<- *prometheus.Desc) {
+	lg.pg.Describe(c)
+}
+
+func (lg *labeledGauge) Collect(c chan<- prometheus.Metric) {
+	lg.pg.Collect(c)
+}
+
+type gauge struct {
+	pg prometheus.Gauge
+}
+
+func (g *gauge) Inc(vs ...float64) {
+	if len(vs) == 0 {
+		g.pg.Inc()
+	}
+
+	g.Add(sumFloat64(vs...))
+}
+
+func (g *gauge) Dec(vs ...float64) {
+	if len(vs) == 0 {
+		g.pg.Dec()
+	}
+
+	g.Add(-sumFloat64(vs...))
+}
+
+func (g *gauge) Add(v float64) {
+	g.pg.Add(v)
+}
+
+func (g *gauge) Set(v float64) {
+	g.pg.Set(v)
+}
+
+func (g *gauge) Describe(c chan<- *prometheus.Desc) {
+	g.pg.Describe(c)
+}
+
+func (g *gauge) Collect(c chan<- prometheus.Metric) {
+	g.pg.Collect(c)
+}

vendor/src/github.com/docker/go-metrics/handler.go

@@ -0,0 +1,13 @@
+package metrics
+
+import (
+	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Handler returns the global http.Handler that provides the prometheus
+// metrics format on GET requests
+func Handler() http.Handler {
+	return prometheus.Handler()
+}

vendor/src/github.com/docker/go-metrics/helpers.go

@@ -0,0 +1,10 @@
+package metrics
+
+func sumFloat64(vs ...float64) float64 {
+	var sum float64
+	for _, v := range vs {
+		sum += v
+	}
+
+	return sum
+}

vendor/src/github.com/docker/go-metrics/namespace.go

@@ -0,0 +1,159 @@
+package metrics
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type Labels map[string]string
+
+// NewNamespace returns a namespaces that is responsible for managing a collection of
+// metrics for a particual namespace and subsystem
+//
+// labels allows const labels to be added to all metrics created in this namespace
+// and are commonly used for data like application version and git commit
+func NewNamespace(name, subsystem string, labels Labels) *Namespace {
+	if labels == nil {
+		labels = make(map[string]string)
+	}
+	return &Namespace{
+		name:      name,
+		subsystem: subsystem,
+		labels:    labels,
+	}
+}
+
+// Namespace describes a set of metrics that share a namespace and subsystem.
+type Namespace struct {
+	name      string
+	subsystem string
+	labels    Labels
+	mu        sync.Mutex
+	metrics   []prometheus.Collector
+}
+
+// WithConstLabels returns a namespace with the provided set of labels merged
+// with the existing constant labels on the namespace.
+//
+//  Only metrics created with the returned namespace will get the new constant
+//  labels.  The returned namespace must be registered separately.
+func (n *Namespace) WithConstLabels(labels Labels) *Namespace {
+	ns := *n
+	ns.metrics = nil // blank this out
+	ns.labels = mergeLabels(ns.labels, labels)
+	return &ns
+}
+
+func (n *Namespace) NewCounter(name, help string) Counter {
+	c := &counter{pc: prometheus.NewCounter(n.newCounterOpts(name, help))}
+	n.addMetric(c)
+	return c
+}
+
+func (n *Namespace) NewLabeledCounter(name, help string, labels ...string) LabeledCounter {
+	c := &labeledCounter{pc: prometheus.NewCounterVec(n.newCounterOpts(name, help), labels)}
+	n.addMetric(c)
+	return c
+}
+
+func (n *Namespace) newCounterOpts(name, help string) prometheus.CounterOpts {
+	return prometheus.CounterOpts{
+		Namespace:   n.name,
+		Subsystem:   n.subsystem,
+		Name:        fmt.Sprintf("%s_%s", name, Total),
+		Help:        help,
+		ConstLabels: prometheus.Labels(n.labels),
+	}
+}
+
+func (n *Namespace) NewTimer(name, help string) Timer {
+	t := &timer{
+		m: prometheus.NewHistogram(n.newTimerOpts(name, help)),
+	}
+	n.addMetric(t)
+	return t
+}
+
+func (n *Namespace) NewLabeledTimer(name, help string, labels ...string) LabeledTimer {
+	t := &labeledTimer{
+		m: prometheus.NewHistogramVec(n.newTimerOpts(name, help), labels),
+	}
+	n.addMetric(t)
+	return t
+}
+
+func (n *Namespace) newTimerOpts(name, help string) prometheus.HistogramOpts {
+	return prometheus.HistogramOpts{
+		Namespace:   n.name,
+		Subsystem:   n.subsystem,
+		Name:        fmt.Sprintf("%s_%s", name, Seconds),
+		Help:        help,
+		ConstLabels: prometheus.Labels(n.labels),
+	}
+}
+
+func (n *Namespace) NewGauge(name, help string, unit Unit) Gauge {
+	g := &gauge{
+		pg: prometheus.NewGauge(n.newGaugeOpts(name, help, unit)),
+	}
+	n.addMetric(g)
+	return g
+}
+
+func (n *Namespace) NewLabeledGauge(name, help string, unit Unit, labels ...string) LabeledGauge {
+	g := &labeledGauge{
+		pg: prometheus.NewGaugeVec(n.newGaugeOpts(name, help, unit), labels),
+	}
+	n.addMetric(g)
+	return g
+}
+
+func (n *Namespace) newGaugeOpts(name, help string, unit Unit) prometheus.GaugeOpts {
+	return prometheus.GaugeOpts{
+		Namespace:   n.name,
+		Subsystem:   n.subsystem,
+		Name:        fmt.Sprintf("%s_%s", name, unit),
+		Help:        help,
+		ConstLabels: prometheus.Labels(n.labels),
+	}
+}
+
+func (n *Namespace) Describe(ch chan<- *prometheus.Desc) {
+	n.mu.Lock()
+	defer n.mu.Unlock()
+
+	for _, metric := range n.metrics {
+		metric.Describe(ch)
+	}
+}
+
+func (n *Namespace) Collect(ch chan<- prometheus.Metric) {
+	n.mu.Lock()
+	defer n.mu.Unlock()
+
+	for _, metric := range n.metrics {
+		metric.Collect(ch)
+	}
+}
+
+func (n *Namespace) addMetric(collector prometheus.Collector) {
+	n.mu.Lock()
+	n.metrics = append(n.metrics, collector)
+	n.mu.Unlock()
+}
+
+// mergeLabels merges two or more labels objects into a single map, favoring
+// the later labels.
+func mergeLabels(lbs ...Labels) Labels {
+	merged := make(Labels)
+
+	for _, target := range lbs {
+		for k, v := range target {
+			merged[k] = v
+		}
+	}
+
+	return merged
+}

vendor/src/github.com/docker/go-metrics/register.go

@@ -0,0 +1,15 @@
+package metrics
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// Register adds all the metrics in the provided namespace to the global
+// metrics registry
+func Register(n *Namespace) {
+	prometheus.MustRegister(n)
+}
+
+// Deregister removes all the metrics in the provided namespace from the
+// global metrics registry
+func Deregister(n *Namespace) {
+	prometheus.Unregister(n)
+}

vendor/src/github.com/docker/go-metrics/timer.go

@@ -0,0 +1,68 @@
+package metrics
+
+import (
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// StartTimer begins a timer observation at the callsite. When the target
+// operation is completed, the caller should call the return done func().
+func StartTimer(timer Timer) (done func()) {
+	start := time.Now()
+	return func() {
+		timer.Update(time.Since(start))
+	}
+}
+
+// Timer is a metric that allows collecting the duration of an action in seconds
+type Timer interface {
+	// Update records an observation, duration, and converts to the target
+	// units.
+	Update(duration time.Duration)
+
+	// UpdateSince will add the duration from the provided starting time to the
+	// timer's summary with the precisions that was used in creation of the timer
+	UpdateSince(time.Time)
+}
+
+// LabeledTimer is a timer that must have label values populated before use.
+type LabeledTimer interface {
+	WithValues(labels ...string) Timer
+}
+
+type labeledTimer struct {
+	m *prometheus.HistogramVec
+}
+
+func (lt *labeledTimer) WithValues(labels ...string) Timer {
+	return &timer{m: lt.m.WithLabelValues(labels...)}
+}
+
+func (lt *labeledTimer) Describe(c chan<- *prometheus.Desc) {
+	lt.m.Describe(c)
+}
+
+func (lt *labeledTimer) Collect(c chan<- prometheus.Metric) {
+	lt.m.Collect(c)
+}
+
+type timer struct {
+	m prometheus.Histogram
+}
+
+func (t *timer) Update(duration time.Duration) {
+	t.m.Observe(duration.Seconds())
+}
+
+func (t *timer) UpdateSince(since time.Time) {
+	t.m.Observe(time.Since(since).Seconds())
+}
+
+func (t *timer) Describe(c chan<- *prometheus.Desc) {
+	t.m.Describe(c)
+}
+
+func (t *timer) Collect(c chan<- prometheus.Metric) {
+	t.m.Collect(c)
+}

vendor/src/github.com/docker/go-metrics/unit.go

@@ -0,0 +1,12 @@
+package metrics
+
+// Unit represents the type or precision of a metric that is appended to
+// the metrics fully qualified name
+type Unit string
+
+const (
+	Nanoseconds Unit = "nanoseconds"
+	Seconds     Unit = "seconds"
+	Bytes       Unit = "bytes"
+	Total       Unit = "total"
+)