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Add Prometheus Metrics

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at the first iteration, only the following metrics are collected:

  - HTTP metrics of each API endpoint
  - cache counter for request/hit/miss
  - histogram of storage actions, including:
    GetContent, PutContent, Stat, List, Move, and Delete

Signed-off-by: tifayuki <tifayuki@gmail.com>
This commit is contained in:
tifayuki 2017-11-16 16:43:38 -08:00
parent 3800056b88
commit e3c37a46e2
118 changed files with 17182 additions and 1550 deletions
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Docker
Copyright 2012-2015 Docker, Inc.
This product includes software developed at Docker, Inc. (https://www.docker.com).
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# 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.
## Best Practices
This packages is meant to be used for collecting metrics in Docker projects.
It is not meant to be used as a replacement for the prometheus client but to help enforce consistent naming across metrics collected.
If you have not already read the prometheus best practices around naming and labels you can read the page [here](https://prometheus.io/docs/practices/naming/).
The following are a few Docker specific rules that will help you name and work with metrics in your project.
1. Namespace and Subsystem
This package provides you with a namespace type that allows you to specify the same namespace and subsystem for your metrics.
```go
ns := metrics.NewNamespace("engine", "daemon", metrics.Labels{
"version": dockerversion.Version,
"commit": dockerversion.GitCommit,
})
```
In the example above we are creating metrics for the Docker engine's daemon package.
`engine` would be the namespace in this example where `daemon` is the subsystem or package where we are collecting the metrics.
A namespace also allows you to attach constant labels to the metrics such as the git commit and version that it is collecting.
2. Declaring your Metrics
Try to keep all your metric declarations in one file.
This makes it easy for others to see what constant labels are defined on the namespace and what labels are defined on the metrics when they are created.
3. Use labels instead of multiple metrics
Labels allow you to define one metric such as the time it takes to perform a certain action on an object.
If we wanted to collect timings on various container actions such as create, start, and delete then we can define one metric called `container_actions` and use labels to specify the type of action.
```go
containerActions = ns.NewLabeledTimer("container_actions", "The number of milliseconds it takes to process each container action", "action")
```
The last parameter is the label name or key.
When adding a data point to the metric you will use the `WithValues` function to specify the `action` that you are collecting for.
```go
containerActions.WithValues("create").UpdateSince(start)
```
4. Always use a unit
The metric name should describe what you are measuring but you also need to provide the unit that it is being measured with.
For a timer, the standard unit is seconds and a counter's standard unit is a total.
For gauges you must provide the unit.
This package provides a standard set of units for use within the Docker projects.
```go
Nanoseconds Unit = "nanoseconds"
Seconds Unit = "seconds"
Bytes Unit = "bytes"
Total Unit = "total"
```
If you need to use a unit but it is not defined in the package please open a PR to add it but first try to see if one of the already created units will work for your metric, i.e. seconds or nanoseconds vs adding milliseconds.
## Docs
Package documentation can be found [here](https://godoc.org/github.com/docker/go-metrics).
## HTTP Metrics
To instrument a http handler, you can wrap the code like this:
```go
namespace := metrics.NewNamespace("docker_distribution", "http", metrics.Labels{"handler": "your_http_handler_name"})
httpMetrics := namespace.NewDefaultHttpMetrics()
metrics.Register(namespace)
instrumentedHandler = metrics.InstrumentHandler(httpMetrics, unInstrumentedHandler)
```
Note: The `handler` label must be provided when a new namespace is created.
## Additional Metrics
Additional metrics are also defined here that are not available 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/.

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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)
}

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// 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

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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)
}

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package metrics
import (
"net/http"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
// HTTPHandlerOpts describes a set of configurable options of http metrics
type HTTPHandlerOpts struct {
DurationBuckets []float64
RequestSizeBuckets []float64
ResponseSizeBuckets []float64
}
const (
InstrumentHandlerResponseSize = iota
InstrumentHandlerRequestSize
InstrumentHandlerDuration
InstrumentHandlerCounter
InstrumentHandlerInFlight
)
type HTTPMetric struct {
prometheus.Collector
handlerType int
}
var (
defaultDurationBuckets = []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 25, 60}
defaultRequestSizeBuckets = prometheus.ExponentialBuckets(1024, 2, 22) //1K to 4G
defaultResponseSizeBuckets = defaultRequestSizeBuckets
)
// Handler returns the global http.Handler that provides the prometheus
// metrics format on GET requests. This handler is no longer instrumented.
func Handler() http.Handler {
return promhttp.Handler()
}
func InstrumentHandler(metrics []*HTTPMetric, handler http.Handler) http.HandlerFunc {
return InstrumentHandlerFunc(metrics, handler.ServeHTTP)
}
func InstrumentHandlerFunc(metrics []*HTTPMetric, handlerFunc http.HandlerFunc) http.HandlerFunc {
var handler http.Handler
handler = http.HandlerFunc(handlerFunc)
for _, metric := range metrics {
switch metric.handlerType {
case InstrumentHandlerResponseSize:
if collector, ok := metric.Collector.(prometheus.ObserverVec); ok {
handler = promhttp.InstrumentHandlerResponseSize(collector, handler)
}
case InstrumentHandlerRequestSize:
if collector, ok := metric.Collector.(prometheus.ObserverVec); ok {
handler = promhttp.InstrumentHandlerRequestSize(collector, handler)
}
case InstrumentHandlerDuration:
if collector, ok := metric.Collector.(prometheus.ObserverVec); ok {
handler = promhttp.InstrumentHandlerDuration(collector, handler)
}
case InstrumentHandlerCounter:
if collector, ok := metric.Collector.(*prometheus.CounterVec); ok {
handler = promhttp.InstrumentHandlerCounter(collector, handler)
}
case InstrumentHandlerInFlight:
if collector, ok := metric.Collector.(prometheus.Gauge); ok {
handler = promhttp.InstrumentHandlerInFlight(collector, handler)
}
}
}
return handler.ServeHTTP
}

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

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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 {
n.mu.Lock()
ns := &Namespace{
name: n.name,
subsystem: n.subsystem,
labels: mergeLabels(n.labels, labels),
}
n.mu.Unlock()
return ns
}
func (n *Namespace) NewCounter(name, help string) Counter {
c := &counter{pc: prometheus.NewCounter(n.newCounterOpts(name, help))}
n.Add(c)
return c
}
func (n *Namespace) NewLabeledCounter(name, help string, labels ...string) LabeledCounter {
c := &labeledCounter{pc: prometheus.NewCounterVec(n.newCounterOpts(name, help), labels)}
n.Add(c)
return c
}
func (n *Namespace) newCounterOpts(name, help string) prometheus.CounterOpts {
return prometheus.CounterOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: makeName(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.Add(t)
return t
}
func (n *Namespace) NewLabeledTimer(name, help string, labels ...string) LabeledTimer {
t := &labeledTimer{
m: prometheus.NewHistogramVec(n.newTimerOpts(name, help), labels),
}
n.Add(t)
return t
}
func (n *Namespace) newTimerOpts(name, help string) prometheus.HistogramOpts {
return prometheus.HistogramOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: makeName(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.Add(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.Add(g)
return g
}
func (n *Namespace) newGaugeOpts(name, help string, unit Unit) prometheus.GaugeOpts {
return prometheus.GaugeOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: makeName(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) Add(collector prometheus.Collector) {
n.mu.Lock()
n.metrics = append(n.metrics, collector)
n.mu.Unlock()
}
func (n *Namespace) NewDesc(name, help string, unit Unit, labels ...string) *prometheus.Desc {
name = makeName(name, unit)
namespace := n.name
if n.subsystem != "" {
namespace = fmt.Sprintf("%s_%s", namespace, n.subsystem)
}
name = fmt.Sprintf("%s_%s", namespace, name)
return prometheus.NewDesc(name, help, labels, prometheus.Labels(n.labels))
}
// 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
}
func makeName(name string, unit Unit) string {
if unit == "" {
return name
}
return fmt.Sprintf("%s_%s", name, unit)
}
func (n *Namespace) NewDefaultHttpMetrics(handlerName string) []*HTTPMetric {
return n.NewHttpMetricsWithOpts(handlerName, HTTPHandlerOpts{
DurationBuckets: defaultDurationBuckets,
RequestSizeBuckets: defaultResponseSizeBuckets,
ResponseSizeBuckets: defaultResponseSizeBuckets,
})
}
func (n *Namespace) NewHttpMetrics(handlerName string, durationBuckets, requestSizeBuckets, responseSizeBuckets []float64) []*HTTPMetric {
return n.NewHttpMetricsWithOpts(handlerName, HTTPHandlerOpts{
DurationBuckets: durationBuckets,
RequestSizeBuckets: requestSizeBuckets,
ResponseSizeBuckets: responseSizeBuckets,
})
}
func (n *Namespace) NewHttpMetricsWithOpts(handlerName string, opts HTTPHandlerOpts) []*HTTPMetric {
var httpMetrics []*HTTPMetric
inFlightMetric := n.NewInFlightGaugeMetric(handlerName)
requestTotalMetric := n.NewRequestTotalMetric(handlerName)
requestDurationMetric := n.NewRequestDurationMetric(handlerName, opts.DurationBuckets)
requestSizeMetric := n.NewRequestSizeMetric(handlerName, opts.RequestSizeBuckets)
responseSizeMetric := n.NewResponseSizeMetric(handlerName, opts.ResponseSizeBuckets)
httpMetrics = append(httpMetrics, inFlightMetric, requestDurationMetric, requestTotalMetric, requestSizeMetric, responseSizeMetric)
return httpMetrics
}
func (n *Namespace) NewInFlightGaugeMetric(handlerName string) *HTTPMetric {
labels := prometheus.Labels(n.labels)
labels["handler"] = handlerName
metric := prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: "in_flight_requests",
Help: "The in-flight HTTP requests",
ConstLabels: prometheus.Labels(labels),
})
httpMetric := &HTTPMetric{
Collector: metric,
handlerType: InstrumentHandlerInFlight,
}
n.Add(httpMetric)
return httpMetric
}
func (n *Namespace) NewRequestTotalMetric(handlerName string) *HTTPMetric {
labels := prometheus.Labels(n.labels)
labels["handler"] = handlerName
metric := prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: "requests_total",
Help: "Total number of HTTP requests made.",
ConstLabels: prometheus.Labels(labels),
},
[]string{"code", "method"},
)
httpMetric := &HTTPMetric{
Collector: metric,
handlerType: InstrumentHandlerCounter,
}
n.Add(httpMetric)
return httpMetric
}
func (n *Namespace) NewRequestDurationMetric(handlerName string, buckets []float64) *HTTPMetric {
if len(buckets) == 0 {
panic("DurationBuckets must be provided")
}
labels := prometheus.Labels(n.labels)
labels["handler"] = handlerName
opts := prometheus.HistogramOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: "request_duration_seconds",
Help: "The HTTP request latencies in seconds.",
Buckets: buckets,
ConstLabels: prometheus.Labels(labels),
}
metric := prometheus.NewHistogramVec(opts, []string{"method"})
httpMetric := &HTTPMetric{
Collector: metric,
handlerType: InstrumentHandlerDuration,
}
n.Add(httpMetric)
return httpMetric
}
func (n *Namespace) NewRequestSizeMetric(handlerName string, buckets []float64) *HTTPMetric {
if len(buckets) == 0 {
panic("RequestSizeBuckets must be provided")
}
labels := prometheus.Labels(n.labels)
labels["handler"] = handlerName
opts := prometheus.HistogramOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: "request_size_bytes",
Help: "The HTTP request sizes in bytes.",
Buckets: buckets,
ConstLabels: prometheus.Labels(labels),
}
metric := prometheus.NewHistogramVec(opts, []string{})
httpMetric := &HTTPMetric{
Collector: metric,
handlerType: InstrumentHandlerRequestSize,
}
n.Add(httpMetric)
return httpMetric
}
func (n *Namespace) NewResponseSizeMetric(handlerName string, buckets []float64) *HTTPMetric {
if len(buckets) == 0 {
panic("ResponseSizeBuckets must be provided")
}
labels := prometheus.Labels(n.labels)
labels["handler"] = handlerName
opts := prometheus.HistogramOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: "response_size_bytes",
Help: "The HTTP response sizes in bytes.",
Buckets: buckets,
ConstLabels: prometheus.Labels(labels),
}
metrics := prometheus.NewHistogramVec(opts, []string{})
httpMetric := &HTTPMetric{
Collector: metrics,
handlerType: InstrumentHandlerResponseSize,
}
n.Add(httpMetric)
return httpMetric
}

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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)
}

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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) *labeledTimerObserver
}
type labeledTimer struct {
m *prometheus.HistogramVec
}
type labeledTimerObserver struct {
m prometheus.Observer
}
func (lbo *labeledTimerObserver) Update(duration time.Duration) {
lbo.m.Observe(duration.Seconds())
}
func (lbo *labeledTimerObserver) UpdateSince(since time.Time) {
lbo.m.Observe(time.Since(since).Seconds())
}
func (lt *labeledTimer) WithValues(labels ...string) *labeledTimerObserver {
return &labeledTimerObserver{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.Observer
}
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) {
c <- t.m.(prometheus.Metric).Desc()
}
func (t *timer) Collect(c chan<- prometheus.Metric) {
// Are there any observers that don't implement Collector? It is really
// unclear what the point of the upstream change was, but we'll let this
// panic if we get an observer that doesn't implement collector. In this
// case, we should almost always see metricVec objects, so this should
// never panic.
t.m.(prometheus.Collector).Collect(c)
}

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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"
)