metrics

package module
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README

go-metrics-plus

Go Reference JavaScript Style Guide GitHub Workflow Status (with event) GitHub go.mod Go version (subdirectory of monorepo)

Go Metrics Library with support for Graphite, InfluxDB, Prometheus, StatsD, and AppOptics. This is a lively fork of RCrowley's go-metrics including updated backend drivers, support for labels/tags, and various optimizations.

Install

Download as a Go module dependency:

go get github.com/zeim839/go-metrics-plus

Import into your project:

import "github.com/zeim839/go-metrics-plus"

Usage

c := metrics.NewCounter(nil)
metrics.Register("foo", c)
c.Inc(47)

g := metrics.NewGauge(metrics.Labels{"key":"value"})
metrics.Register("bar", g)
g.Update(47)

r := NewRegistry()
g := metrics.NewRegisteredFunctionalGauge("cache-evictions", r, func() int64 {
	return cache.getEvictionsCount()
}, metrics.Labels{"key":"value"})

s := metrics.NewExpDecaySample(1028, 0.015) // or metrics.NewUniformSample(1028)
h := metrics.NewHistogram(s, nil)
metrics.Register("baz", h)
h.Update(47)

m := metrics.NewMeter(nil)
metrics.Register("quux", m)
m.Mark(47)

t := metrics.NewTimer(nil)
metrics.Register("bang", t)
t.Time(func() {})
t.Update(47)

Register() is not threadsafe. For threadsafe metric registration use GetOrRegister:

t := metrics.GetOrRegisterTimer("account.create.latency", nil, nil)
t.Time(func() {})
t.Update(47)

Periodically log every metric in human-readable form to standard error:

import (
	"github.com/zeim839/go-metrics-plus"
	"github.com/zeim839/go-metrics-plus/logging"
	"time"
)

// Log the DefaultRegistry to stdout every second.
go logging.Logger(logging.Encode, metrics.DefaultRegistry, time.Second, "some.prefix"

Publishing Metrics

Contributing

Thank you for considering to contribute to go-metrics-plus. We accept contributions from anyone on the internet.

If you'd like to propose a new feature or report an issue, please do so in the GitHub issues section. If you'd like to contribute documentation or code, then please fork, fix, commit, and send a pull request. A maintainer will then review and merge your changes to the codebase. Pull requests must be opened on the 'master' branch.

Please make sure your contributions adhere to our coding guidelines:

  • Code must adhere to the official Go formatting guidelines (i.e uses gofmt).
  • Code must be documented adhering to the official Go commentary guidelines.
  • Pull requests need to be based on and opened against the master branch.

License

This project is an amalgamation of various open-source projects. You may assume that each directory in the source tree represents a separate package distribution, with its corresponding license documented in a LICENSE.md file contained within the directory.

The root directory is governed by go-metrics's original project license, reproduced in LICENSE.md.

Documentation

Overview

Example 
c := NewCounter()
Register("money", c)
c.Inc(17)

// Threadsafe registration
t := GetOrRegisterTimer("db.get.latency", nil)
t.Time(func() {})
t.Update(1)

fmt.Println(c.Count())
fmt.Println(t.Min())

Output:

17
1

Index

Examples

Constants

This section is empty.

Variables

View Source 
var UseNilMetrics bool = false

UseNilMetrics is checked by the constructor functions for all of the standard metrics. If it is true, the metric returned is a stub.

This global kill-switch helps quantify the observer effect and makes for less cluttered pprof profiles.

Functions

func CaptureCPUStats 

func CaptureCPUStats(d time.Duration)

CaptureCPUStats captures new values for the Go process CPU usage statistics exported in cpu.CPUStats. This is designed to be called as a goroutine.

func CaptureCPUStatsOnce 

func CaptureCPUStatsOnce()

CaptureCPUStatsOnce captures new values for the Go process CPU usage statistics exported in cpu.CPUStats. This is designed to be called in a background goroutine.

func CaptureDebugGCStats 

func CaptureDebugGCStats(r Registry, d time.Duration)

CaptureDebugGCStats captures new values for the Go garbage collector statistics exported in debug.GCStats. This is designed to be called as a goroutine.

func CaptureDebugGCStatsOnce 

func CaptureDebugGCStatsOnce(r Registry)

CaptureDebugGCStatsOnce capture new values for the Go garbage collector statistics exported in debug.GCStats. This is designed to be called in a background goroutine. Giving a registry which has not been given to RegisterDebugGCStats will panic.

Be careful (but much less so) with this because debug.ReadGCStats calls the C function runtime·lock(runtime·mheap) which, while not a stop-the-world operation, isn't something you want to be doing all the time.

func CaptureDiskStats 

func CaptureDiskStats(d time.Duration)

CaptureDiskStats captures new values for the Go process disk usage statistics exported in disk.DiskStats. This is designed to be called as a goroutine.

func CaptureDiskStatsOnce 

func CaptureDiskStatsOnce()

CaptureDiskStatsOnce captures new values for the Go process disk usage statistics exported in disk.DiskStats. This is designed to be called in a background goroutine.

func CaptureRuntimeMemStats 

func CaptureRuntimeMemStats(r Registry, d time.Duration)

CaptureRuntimeMemStats captures new values for the Go runtime statistics exported in runtime.MemStats. This is designed to be called as a goroutine.

func CaptureRuntimeMemStatsOnce 

func CaptureRuntimeMemStatsOnce(r Registry)

CaptureRuntimeMemStatsOnce captures new values for the Go runtime statistics exported in runtime.MemStats. This is designed to be called in a background goroutine. Giving a registry which has not been given to RegisterRuntimeMemStats will panic.

Be very careful with this because runtime.ReadMemStats calls the C functions runtime·semacquire(&runtime·worldsema) and runtime·stoptheworld() and that last one does what it says on the tin.

func Each 

func Each(f func(string, interface{}))

Each calls the given function for each registered metric.

func Get 

func Get(name string) interface{}

Get the metric by the given name or nil if none is registered.

func GetOrRegister 

func GetOrRegister(name string, i interface{}) interface{}

GetOrRegister gets an existing metric or creates and registers a new one. Threadsafe alternative to calling Get and Register on failure.

func MustRegister 

func MustRegister(name string, i interface{})

MustRegister registers the given metric under the given name. Panics if a metric by the given name is already registered.

func ReadCPUStats 

func ReadCPUStats(stats *CPUStats) error

ReadCPUStats retrieves the current CPU stats.

func ReadDiskStats 

func ReadDiskStats(stats *DiskStats) error

ReadDiskStats retrieves the disk IO stats belonging to the current process.

func Register 

func Register(name string, i interface{}) error

Register the given metric under the given name. Returns a DuplicateMetric if a metric by the given name is already registered.

func RegisterCPUStats 

func RegisterCPUStats(r Registry)

RegisterCPUStats registers metrics for the Go process CPU usage statistics exported in cpu.CPUStats.

func RegisterDebugGCStats 

func RegisterDebugGCStats(r Registry)

RegisterDebugGCStats registers metrics for the Go garbage collector statistics exported in debug.GCStats. The metrics are named by their fully-qualified Go symbols, i.e. debug.GCStats.PauseTotal.

func RegisterDiskStats 

func RegisterDiskStats(r Registry)

RegisterDiskStats registers metrics for the Go process disk usage statistics exported in disk.DiskStats.

func RegisterRuntimeMemStats 

func RegisterRuntimeMemStats(r Registry)

RegisterRuntimeMemStats registers runtime metrics for the Go runtime statistics exported in runtime and specifically runtime.MemStats. The runtimeMetrics are named by their fully-qualified Go symbols, i.e. runtime.MemStats.Alloc.

func RunHealthchecks 

func RunHealthchecks()

RunHealthchecks runs all registered healthchecks.

func SampleMax 

func SampleMax(values []int64) int64

SampleMax returns the maximum value of the slice of int64.

func SampleMean 

func SampleMean(values []int64) float64

SampleMean returns the mean value of the slice of int64.

func SampleMin 

func SampleMin(values []int64) int64

SampleMin returns the minimum value of the slice of int64.

func SamplePercentile 

func SamplePercentile(values int64Slice, p float64) float64

SamplePercentile returns an arbitrary percentile of the slice of int64.

func SamplePercentiles 

func SamplePercentiles(values int64Slice, ps []float64) []float64

SamplePercentiles returns a slice of arbitrary percentiles of the slice of int64.

func SampleStdDev 

func SampleStdDev(values []int64) float64

SampleStdDev returns the standard deviation of the slice of int64.

func SampleSum 

func SampleSum(values []int64) int64

SampleSum returns the sum of the slice of int64.

func SampleVariance 

func SampleVariance(values []int64) float64

SampleVariance returns the variance of the slice of int64.

func SinkOnce 

func SinkOnce(name string, i interface{})

SinkOnce enqueues the given metric without registering it, allowing it to be picked up by Each() only once.

func Unregister 

func Unregister(name string)

Unregister the metric with the given name.

func WriteJSON 

func WriteJSON(r Registry, d time.Duration, w io.Writer)

WriteJSON writes metrics from the given registry periodically to the specified io.Writer as JSON.

func WriteJSONOnce 

func WriteJSONOnce(r Registry, w io.Writer)

WriteJSONOnce writes metrics from the given registry to the specified io.Writer as JSON.

Types

type CPUStats 

type CPUStats struct {
	GlobalTime float64 // Time spent by the CPU working on all processes.
	GlobalWait float64 // Time spent by waiting on disk for all processes.
	LocalTime  float64 // Time spent by the CPU working on this process.
}

CPUStats is the system and process CPU stats. All values are in seconds.

type Counter 

type Counter interface {
	Clear()
	Count() int64
	Dec(int64)
	Inc(int64)
	Snapshot() Counter
}

Counter holds an int64 value that can be incremented and decremented.

func GetOrRegisterCounter 

func GetOrRegisterCounter(name string, r Registry) Counter

GetOrRegisterCounter returns an existing Counter or constructs and registers a new StandardCounter.

func NewCounter 

func NewCounter() Counter

NewCounter constructs a new StandardCounter.

func NewRegisteredCounter 

func NewRegisteredCounter(name string, r Registry) Counter

NewRegisteredCounter constructs and registers a new StandardCounter.

type CounterSnapshot 

type CounterSnapshot struct {
	// contains filtered or unexported fields
}

CounterSnapshot is a read-only copy of another Counter.

func (CounterSnapshot) Clear 

func (CounterSnapshot) Clear()

Clear panics.

func (CounterSnapshot) Count 

func (c CounterSnapshot) Count() int64

Count returns the count at the time the snapshot was taken.

func (CounterSnapshot) Dec 

func (CounterSnapshot) Dec(int64)

Dec panics.

func (CounterSnapshot) Inc 

func (CounterSnapshot) Inc(int64)

Inc panics.

func (CounterSnapshot) Snapshot 

func (c CounterSnapshot) Snapshot() Counter

Snapshot returns the snapshot.

type DiskStats 

type DiskStats struct {
	ReadCount  int64 // Number of read operations executed
	ReadBytes  int64 // Total number of bytes read
	WriteCount int64 // Number of write operations executed
	WriteBytes int64 // Total number of byte written
}

DiskStats is the per process disk io stats.

type DuplicateMetric 

type DuplicateMetric string

DuplicateMetric is the error returned by Registry.Register when a metric already exists. If you mean to Register that metric you must first Unregister the existing metric.

func (DuplicateMetric) Error 

func (err DuplicateMetric) Error() string

type EWMA 

type EWMA interface {
	Rate() float64
	Snapshot() EWMA
	Update(int64)
}

EWMA calculates an exponentially-weighted moving average

func NewEWMA 

func NewEWMA(alpha float64) EWMA

NewEWMA constructs a new EWMA with the given alpha.

func NewEWMA1 

func NewEWMA1() EWMA

NewEWMA1 constructs a new EWMA for a one-minute moving average.

func NewEWMA15 

func NewEWMA15() EWMA

NewEWMA15 constructs a new EWMA for a fifteen-minute moving average.

func NewEWMA5 

func NewEWMA5() EWMA

NewEWMA5 constructs a new EWMA for a five-minute moving average.

type EWMASnapshot 

type EWMASnapshot float64

EWMASnapshot is a read-only copy of another EWMA.

func (EWMASnapshot) Rate 

func (a EWMASnapshot) Rate() float64

Rate returns the rate of events per second at the time the snapshot was taken.

func (EWMASnapshot) Snapshot 

func (a EWMASnapshot) Snapshot() EWMA

Snapshot returns the snapshot.

func (EWMASnapshot) Update 

func (EWMASnapshot) Update(int64)

Update is a no-op.

type ExpDecaySample 

type ExpDecaySample struct {
	// contains filtered or unexported fields
}

ExpDecaySample is an exponentially-decaying sample using a forward-decaying priority reservoir. See Cormode et al's "Forward Decay: A Practical Time Decay Model for Streaming Systems".

<http://dimacs.rutgers.edu/~graham/pubs/papers/fwddecay.pdf>

func (*ExpDecaySample) Clear 

func (s *ExpDecaySample) Clear()

Clear clears all samples.

func (*ExpDecaySample) Count 

func (s *ExpDecaySample) Count() int64

Count returns the number of samples recorded, which may exceed the reservoir size.

func (*ExpDecaySample) Max 

func (s *ExpDecaySample) Max() int64

Max returns the maximum value in the sample, which may not be the maximum value ever to be part of the sample.

func (*ExpDecaySample) Mean 

func (s *ExpDecaySample) Mean() float64

Mean returns the mean of the values in the sample.

func (*ExpDecaySample) Min 

func (s *ExpDecaySample) Min() int64

Min returns the minimum value in the sample, which may not be the minimum value ever to be part of the sample.

func (*ExpDecaySample) Percentile 

func (s *ExpDecaySample) Percentile(p float64) float64

Percentile returns an arbitrary percentile of values in the sample.

func (*ExpDecaySample) Percentiles 

func (s *ExpDecaySample) Percentiles(ps []float64) []float64

Percentiles returns a slice of arbitrary percentiles of values in the sample.

func (*ExpDecaySample) SetRand 

func (s *ExpDecaySample) SetRand(prng *rand.Rand) Sample

SetRand sets the random source (useful in testing).

func (*ExpDecaySample) Size 

func (s *ExpDecaySample) Size() int

Size returns the size of the sample, which is at most the reservoir size.

func (*ExpDecaySample) Snapshot 

func (s *ExpDecaySample) Snapshot() Sample

Snapshot returns a read-only copy of the sample.

func (*ExpDecaySample) StdDev 

func (s *ExpDecaySample) StdDev() float64

StdDev returns the standard deviation of the values in the sample.

func (*ExpDecaySample) Sum 

func (s *ExpDecaySample) Sum() int64

Sum returns the sum of the values in the sample.

func (*ExpDecaySample) Update 

func (s *ExpDecaySample) Update(v int64)

Update samples a new value.

func (*ExpDecaySample) Values 

func (s *ExpDecaySample) Values() []int64

Values returns a copy of the values in the sample.

func (*ExpDecaySample) Variance 

func (s *ExpDecaySample) Variance() float64

Variance returns the variance of the values in the sample.

type FunctionalGauge 

type FunctionalGauge struct {
	// contains filtered or unexported fields
}

FunctionalGauge returns value from given function

func (FunctionalGauge) Snapshot 

func (g FunctionalGauge) Snapshot() Gauge

Snapshot returns the snapshot.

func (FunctionalGauge) Update 

func (FunctionalGauge) Update(int64)

Update panics.

func (FunctionalGauge) Value 

func (g FunctionalGauge) Value() int64

Value returns the gauge's current value.

type FunctionalGaugeFloat64 

type FunctionalGaugeFloat64 struct {
	// contains filtered or unexported fields
}

FunctionalGaugeFloat64 returns value from given function

func (FunctionalGaugeFloat64) Snapshot 

func (g FunctionalGaugeFloat64) Snapshot() GaugeFloat64

Snapshot returns the snapshot.

func (FunctionalGaugeFloat64) Update 

func (FunctionalGaugeFloat64) Update(float64)

Update panics.

func (FunctionalGaugeFloat64) Value 

func (g FunctionalGaugeFloat64) Value() float64

Value returns the gauge's current value.

type Gauge 

type Gauge interface {
	Snapshot() Gauge
	Update(int64)
	Value() int64
}

Gauge holds an int64 value that can be set arbitrarily.

func GetOrRegisterGauge 

func GetOrRegisterGauge(name string, r Registry) Gauge

GetOrRegisterGauge returns an existing Gauge or constructs and registers a new StandardGauge.

func NewFunctionalGauge 

func NewFunctionalGauge(f func() int64) Gauge

NewFunctionalGauge constructs a new FunctionalGauge.

func NewGauge 

func NewGauge() Gauge

NewGauge constructs a new StandardGauge.

func NewRegisteredFunctionalGauge 

func NewRegisteredFunctionalGauge(name string, r Registry, f func() int64) Gauge

NewRegisteredFunctionalGauge constructs and registers a new StandardGauge.

func NewRegisteredGauge 

func NewRegisteredGauge(name string, r Registry) Gauge

NewRegisteredGauge constructs and registers a new StandardGauge.

type GaugeFloat64 

type GaugeFloat64 interface {
	Snapshot() GaugeFloat64
	Update(float64)
	Value() float64
}

GaugeFloat64 holds a float64 value that can be set arbitrarily.

func GetOrRegisterGaugeFloat64 

func GetOrRegisterGaugeFloat64(name string, r Registry) GaugeFloat64

GetOrRegisterGaugeFloat64 returns an existing GaugeFloat64 or constructs and registers a new StandardGaugeFloat64.

func NewFunctionalGaugeFloat64 

func NewFunctionalGaugeFloat64(f func() float64) GaugeFloat64

NewFunctionalGaugeFloat64 constructs a new FunctionalGauge.

func NewGaugeFloat64 

func NewGaugeFloat64() GaugeFloat64

NewGaugeFloat64 constructs a new StandardGaugeFloat64.

func NewRegisteredFunctionalGaugeFloat64 

func NewRegisteredFunctionalGaugeFloat64(name string, r Registry, f func() float64) GaugeFloat64

NewRegisteredFunctionalGaugeFloat64 constructs and registers a new StandardGauge.

func NewRegisteredGaugeFloat64 

func NewRegisteredGaugeFloat64(name string, r Registry) GaugeFloat64

NewRegisteredGaugeFloat64 constructs and registers a new StandardGaugeFloat64.

type GaugeFloat64Snapshot 

type GaugeFloat64Snapshot struct {
	// contains filtered or unexported fields
}

GaugeFloat64Snapshot is a read-only copy of another GaugeFloat64.

func (GaugeFloat64Snapshot) Snapshot 

func (g GaugeFloat64Snapshot) Snapshot() GaugeFloat64

Snapshot returns the snapshot.

func (GaugeFloat64Snapshot) Update 

func (GaugeFloat64Snapshot) Update(float64)

Update panics.

func (GaugeFloat64Snapshot) Value 

func (g GaugeFloat64Snapshot) Value() float64

Value returns the value at the time the snapshot was taken.

type GaugeSnapshot 

type GaugeSnapshot struct {
	// contains filtered or unexported fields
}

GaugeSnapshot is a read-only copy of another Gauge.

func (GaugeSnapshot) Snapshot 

func (g GaugeSnapshot) Snapshot() Gauge

Snapshot returns the snapshot.

func (GaugeSnapshot) Update 

func (GaugeSnapshot) Update(int64)

Update panics.

func (GaugeSnapshot) Value 

func (g GaugeSnapshot) Value() int64

Value returns the value at the time the snapshot was taken.

type Healthcheck 

type Healthcheck interface {
	Check()
	Error() error
	Healthy()
	Unhealthy(error)
}

Healthcheck holds an error value describing an arbitrary up/down status.

func NewHealthcheck 

func NewHealthcheck(f func(Healthcheck)) Healthcheck

NewHealthcheck constructs a new Healthcheck which will use the given function to update its status.

type Histogram 

type Histogram interface {
	Clear()
	Count() int64
	Max() int64
	Mean() float64
	Min() int64
	Percentile(float64) float64
	Percentiles([]float64) []float64
	Sample() Sample
	Snapshot() Histogram
	StdDev() float64
	Sum() int64
	Update(int64)
	Variance() float64
}

Histogram calculates distribution statistics from a series of int64 values.

func GetOrRegisterHistogram 

func GetOrRegisterHistogram(name string, r Registry, s Sample) Histogram

GetOrRegisterHistogram returns an existing Histogram or constructs and registers a new StandardHistogram.

func NewHistogram 

func NewHistogram(s Sample) Histogram

NewHistogram constructs a new StandardHistogram from a Sample.

func NewRegisteredHistogram 

func NewRegisteredHistogram(name string, r Registry, s Sample) Histogram

NewRegisteredHistogram constructs and registers a new StandardHistogram from a Sample.

type HistogramSnapshot 

type HistogramSnapshot struct {
	// contains filtered or unexported fields
}

HistogramSnapshot is a read-only copy of another Histogram.

func (*HistogramSnapshot) Clear 

func (*HistogramSnapshot) Clear()

Clear panics.

func (*HistogramSnapshot) Count 

func (h *HistogramSnapshot) Count() int64

Count returns the number of samples recorded at the time the snapshot was taken.

func (*HistogramSnapshot) Max 

func (h *HistogramSnapshot) Max() int64

Max returns the maximum value in the sample at the time the snapshot was taken.

func (*HistogramSnapshot) Mean 

func (h *HistogramSnapshot) Mean() float64

Mean returns the mean of the values in the sample at the time the snapshot was taken.

func (*HistogramSnapshot) Min 

func (h *HistogramSnapshot) Min() int64

Min returns the minimum value in the sample at the time the snapshot was taken.

func (*HistogramSnapshot) Percentile 

func (h *HistogramSnapshot) Percentile(p float64) float64

Percentile returns an arbitrary percentile of values in the sample at the time the snapshot was taken.

func (*HistogramSnapshot) Percentiles 

func (h *HistogramSnapshot) Percentiles(ps []float64) []float64

Percentiles returns a slice of arbitrary percentiles of values in the sample at the time the snapshot was taken.

func (*HistogramSnapshot) Sample 

func (h *HistogramSnapshot) Sample() Sample

Sample returns the Sample underlying the histogram.

func (*HistogramSnapshot) Snapshot 

func (h *HistogramSnapshot) Snapshot() Histogram

Snapshot returns the snapshot.

func (*HistogramSnapshot) StdDev 

func (h *HistogramSnapshot) StdDev() float64

StdDev returns the standard deviation of the values in the sample at the time the snapshot was taken.

func (*HistogramSnapshot) Sum 

func (h *HistogramSnapshot) Sum() int64

Sum returns the sum in the sample at the time the snapshot was taken.

func (*HistogramSnapshot) Update 

func (*HistogramSnapshot) Update(int64)

Update panics.

func (*HistogramSnapshot) Variance 

func (h *HistogramSnapshot) Variance() float64

Variance returns the variance of inputs at the time the snapshot was taken.

type Meter 

type Meter interface {
	Count() int64
	Mark(int64)
	Rate1() float64
	Rate5() float64
	Rate15() float64
	RateMean() float64
	Snapshot() Meter
}

Meter counts events to produce exponentially-weighted moving average rates at one-, five-, and fifteen-minutes and a mean rate.

func GetOrRegisterMeter 

func GetOrRegisterMeter(name string, r Registry) Meter

GetOrRegisterMeter returns an existing Meter or constructs and registers a new StandardMeter.

func NewMeter 

func NewMeter() Meter

NewMeter constructs a new StandardMeter.

func NewRegisteredMeter 

func NewRegisteredMeter(name string, r Registry) Meter

NewRegisteredMeter constructs and registers a new StandardMeter.

type MeterSnapshot 

type MeterSnapshot struct {
	// contains filtered or unexported fields
}

MeterSnapshot is a read-only copy of another Meter.

func (*MeterSnapshot) Count 

func (m *MeterSnapshot) Count() int64

Count returns the count of events at the time the snapshot was taken.

func (*MeterSnapshot) Mark 

func (*MeterSnapshot) Mark(n int64)

Mark panics.

func (*MeterSnapshot) Rate1 

func (m *MeterSnapshot) Rate1() float64

Rate1 returns the one-minute moving average rate of events per second at the time the snapshot was taken.

func (*MeterSnapshot) Rate15 

func (m *MeterSnapshot) Rate15() float64

Rate15 returns the fifteen-minute moving average rate of events per second at the time the snapshot was taken.

func (*MeterSnapshot) Rate5 

func (m *MeterSnapshot) Rate5() float64

Rate5 returns the five-minute moving average rate of events per second at the time the snapshot was taken.

func (*MeterSnapshot) RateMean 

func (m *MeterSnapshot) RateMean() float64

RateMean returns the meter's mean rate of events per second at the time the snapshot was taken.

func (*MeterSnapshot) Snapshot 

func (m *MeterSnapshot) Snapshot() Meter

Snapshot returns the snapshot.

type NilCounter 

type NilCounter struct{}

NilCounter is a no-op Counter.

func (NilCounter) Clear 

func (NilCounter) Clear()

Clear is a no-op.

func (NilCounter) Count 

func (NilCounter) Count() int64

Count is a no-op.

func (NilCounter) Dec 

func (NilCounter) Dec(i int64)

Dec is a no-op.

func (NilCounter) Inc 

func (NilCounter) Inc(i int64)

Inc is a no-op.

func (NilCounter) Snapshot 

func (NilCounter) Snapshot() Counter

Snapshot is a no-op.

type NilEWMA 

type NilEWMA struct{}

NilEWMA is a no-op EWMA.

func (NilEWMA) Rate 

func (NilEWMA) Rate() float64

Rate is a no-op.

func (NilEWMA) Snapshot 

func (NilEWMA) Snapshot() EWMA

Snapshot is a no-op.

func (NilEWMA) Tick 

func (NilEWMA) Tick()

Tick is a no-op.

func (NilEWMA) Update 

func (NilEWMA) Update(n int64)

Update is a no-op.

type NilGauge 

type NilGauge struct{}

NilGauge is a no-op Gauge.

func (NilGauge) Snapshot 

func (NilGauge) Snapshot() Gauge

Snapshot is a no-op.

func (NilGauge) Update 

func (NilGauge) Update(v int64)

Update is a no-op.

func (NilGauge) Value 

func (NilGauge) Value() int64

Value is a no-op.

type NilGaugeFloat64 

type NilGaugeFloat64 struct{}

NilGaugeFloat64 is a no-op Gauge.

func (NilGaugeFloat64) Snapshot 

func (NilGaugeFloat64) Snapshot() GaugeFloat64

Snapshot is a no-op.

func (NilGaugeFloat64) Update 

func (NilGaugeFloat64) Update(v float64)

Update is a no-op.

func (NilGaugeFloat64) Value 

func (NilGaugeFloat64) Value() float64

Value is a no-op.

type NilHealthcheck 

type NilHealthcheck struct{}

NilHealthcheck is a no-op.

func (NilHealthcheck) Check 

func (NilHealthcheck) Check()

Check is a no-op.

func (NilHealthcheck) Error 

func (NilHealthcheck) Error() error

Error is a no-op.

func (NilHealthcheck) Healthy 

func (NilHealthcheck) Healthy()

Healthy is a no-op.

func (NilHealthcheck) Unhealthy 

func (NilHealthcheck) Unhealthy(error)

Unhealthy is a no-op.

type NilHistogram 

type NilHistogram struct{}

NilHistogram is a no-op Histogram.

func (NilHistogram) Clear 

func (NilHistogram) Clear()

Clear is a no-op.

func (NilHistogram) Count 

func (NilHistogram) Count() int64

Count is a no-op.

func (NilHistogram) Max 

func (NilHistogram) Max() int64

Max is a no-op.

func (NilHistogram) Mean 

func (NilHistogram) Mean() float64

Mean is a no-op.

func (NilHistogram) Min 

func (NilHistogram) Min() int64

Min is a no-op.

func (NilHistogram) Percentile 

func (NilHistogram) Percentile(p float64) float64

Percentile is a no-op.

func (NilHistogram) Percentiles 

func (NilHistogram) Percentiles(ps []float64) []float64

Percentiles is a no-op.

func (NilHistogram) Sample 

func (NilHistogram) Sample() Sample

Sample is a no-op.

func (NilHistogram) Snapshot 

func (NilHistogram) Snapshot() Histogram

Snapshot is a no-op.

func (NilHistogram) StdDev 

func (NilHistogram) StdDev() float64

StdDev is a no-op.

func (NilHistogram) Sum 

func (NilHistogram) Sum() int64

Sum is a no-op.

func (NilHistogram) Update 

func (NilHistogram) Update(v int64)

Update is a no-op.

func (NilHistogram) Variance 

func (NilHistogram) Variance() float64

Variance is a no-op.

type NilMeter 

type NilMeter struct{}

NilMeter is a no-op Meter.

func (NilMeter) Count 

func (NilMeter) Count() int64

Count is a no-op.

func (NilMeter) Mark 

func (NilMeter) Mark(n int64)

Mark is a no-op.

func (NilMeter) Rate1 

func (NilMeter) Rate1() float64

Rate1 is a no-op.

func (NilMeter) Rate15 

func (NilMeter) Rate15() float64

Rate15 is a no-op.

func (NilMeter) Rate5 

func (NilMeter) Rate5() float64

Rate5 is a no-op.

func (NilMeter) RateMean 

func (NilMeter) RateMean() float64

RateMean is a no-op.

func (NilMeter) Snapshot 

func (NilMeter) Snapshot() Meter

Snapshot is a no-op.

type NilSample 

type NilSample struct{}

NilSample is a no-op Sample.

func (NilSample) Clear 

func (NilSample) Clear()

Clear is a no-op.

func (NilSample) Count 

func (NilSample) Count() int64

Count is a no-op.

func (NilSample) Max 

func (NilSample) Max() int64

Max is a no-op.

func (NilSample) Mean 

func (NilSample) Mean() float64

Mean is a no-op.

func (NilSample) Min 

func (NilSample) Min() int64

Min is a no-op.

func (NilSample) Percentile 

func (NilSample) Percentile(p float64) float64

Percentile is a no-op.

func (NilSample) Percentiles 

func (NilSample) Percentiles(ps []float64) []float64

Percentiles is a no-op.

func (NilSample) Size 

func (NilSample) Size() int

Size is a no-op.

func (NilSample) Snapshot 

func (NilSample) Snapshot() Sample

Snapshot is a no-op.

func (NilSample) StdDev 

func (NilSample) StdDev() float64

StdDev is a no-op.

func (NilSample) Sum 

func (NilSample) Sum() int64

Sum is a no-op.

func (NilSample) Update 

func (NilSample) Update(v int64)

Update is a no-op.

func (NilSample) Values 

func (NilSample) Values() []int64

Values is a no-op.

func (NilSample) Variance 

func (NilSample) Variance() float64

Variance is a no-op.

type NilTimer 

type NilTimer struct{}

NilTimer is a no-op Timer.

func (NilTimer) Count 

func (NilTimer) Count() int64

Count is a no-op.

func (NilTimer) Max 

func (NilTimer) Max() int64

Max is a no-op.

func (NilTimer) Mean 

func (NilTimer) Mean() float64

Mean is a no-op.

func (NilTimer) Min 

func (NilTimer) Min() int64

Min is a no-op.

func (NilTimer) Percentile 

func (NilTimer) Percentile(p float64) float64

Percentile is a no-op.

func (NilTimer) Percentiles 

func (NilTimer) Percentiles(ps []float64) []float64

Percentiles is a no-op.

func (NilTimer) Rate1 

func (NilTimer) Rate1() float64

Rate1 is a no-op.

func (NilTimer) Rate15 

func (NilTimer) Rate15() float64

Rate15 is a no-op.

func (NilTimer) Rate5 

func (NilTimer) Rate5() float64

Rate5 is a no-op.

func (NilTimer) RateMean 

func (NilTimer) RateMean() float64

RateMean is a no-op.

func (NilTimer) Snapshot 

func (NilTimer) Snapshot() Timer

Snapshot is a no-op.

func (NilTimer) StdDev 

func (NilTimer) StdDev() float64

StdDev is a no-op.

func (NilTimer) Sum 

func (NilTimer) Sum() int64

Sum is a no-op.

func (NilTimer) Time 

func (NilTimer) Time(func())

Time is a no-op.

func (NilTimer) Update 

func (NilTimer) Update(time.Duration)

Update is a no-op.

func (NilTimer) UpdateSince 

func (NilTimer) UpdateSince(time.Time)

UpdateSince is a no-op.

func (NilTimer) Variance 

func (NilTimer) Variance() float64

Variance is a no-op.

type PrefixedRegistry 

type PrefixedRegistry struct {
	// contains filtered or unexported fields
}

PrefixedRegistry manages an underlying registry but exposes it with some given prefix.

func (*PrefixedRegistry) Each 

func (r *PrefixedRegistry) Each(fn func(string, interface{}))

Each calls the given function for each registered metric.

func (*PrefixedRegistry) Get 

func (r *PrefixedRegistry) Get(name string) interface{}

Get the metric by the given name or nil if none is registered.

func (*PrefixedRegistry) GetAll 

func (r *PrefixedRegistry) GetAll() map[string]map[string]interface{}

GetAll metrics in the Registry

func (*PrefixedRegistry) GetOrRegister 

func (r *PrefixedRegistry) GetOrRegister(name string, metric interface{}) interface{}

GetOrRegister gets an existing metric or registers the given one. The interface can be the metric to register if not found in registry, or a function returning the metric for lazy instantiation.

func (*PrefixedRegistry) MarshalJSON 

func (p *PrefixedRegistry) MarshalJSON() ([]byte, error)

MarshalJSON returns a byte slice containing a JSON representation of all the metrics in the Registry.

func (*PrefixedRegistry) Register 

func (r *PrefixedRegistry) Register(name string, metric interface{}) error

Register the given metric under the given name. The name will be prefixed.

func (*PrefixedRegistry) RunHealthchecks 

func (r *PrefixedRegistry) RunHealthchecks()

RunHealthchecks runs all registered healthchecks.

func (*PrefixedRegistry) SinkOnce 

func (r *PrefixedRegistry) SinkOnce(name string, i interface{})

SinkOnce enqueues the given metric without registering it, allowing it to be picked up by Each() only once.

func (*PrefixedRegistry) Unregister 

func (r *PrefixedRegistry) Unregister(name string)

Unregister the metric with the given name. The name will be prefixed.

func (*PrefixedRegistry) UnregisterAll 

func (r *PrefixedRegistry) UnregisterAll()

UnregisterAll unregisters all metrics. (Mostly for testing.)

type Registry 

type Registry interface {

	// Call the given function for each registered metric.
	Each(func(string, interface{}))

	// Get the metric by the given name or nil if none is registered.
	Get(string) interface{}

	// GetAll metrics in the Registry.
	GetAll() map[string]map[string]interface{}

	// Gets an existing metric or registers the given one.
	// The interface can be the metric to register if not found in registry,
	// or a function returning the metric for lazy instantiation.
	GetOrRegister(string, interface{}) interface{}

	// Register the given metric under the given name.
	Register(string, interface{}) error

	// SinkOnce stores a metric in the registry that will be returned by
	// Each() only once. It is not accessible via Get() or GetAll() because
	// it is not registered.
	SinkOnce(string, interface{})

	// Run all registered healthchecks.
	RunHealthchecks()

	// Unregister the metric with the given name.
	Unregister(string)

	// Unregister all metrics.  (Mostly for testing.)
	UnregisterAll()
}

A Registry holds references to a set of metrics by name and can iterate over them, calling callback functions provided by the user.

This is an interface so as to encourage other structs to implement the Registry API as appropriate. 

var DefaultRegistry Registry = NewRegistry()

DefaultRegistry is a globally-scoped registry. The create/register functions fallback to DefaultRegistry when they are passed a nil registry.

func NewPrefixedChildRegistry 

func NewPrefixedChildRegistry(parent Registry, prefix string) Registry

NewPrefixedChildRegistry creates a new PrefixedRegistry from an existing parent registry and assigns the specified prefix.

func NewPrefixedRegistry 

func NewPrefixedRegistry(prefix string) Registry

NewPrefixedRegistry creates a new PrefixedRegistry using the specified prefix.

func NewRegistry 

func NewRegistry() Registry

NewRegistry creates a new registry.

type Sample 

type Sample interface {
	Clear()
	Count() int64
	Max() int64
	Mean() float64
	Min() int64
	Percentile(float64) float64
	Percentiles([]float64) []float64
	Size() int
	Snapshot() Sample
	StdDev() float64
	Sum() int64
	Update(int64)
	Values() []int64
	Variance() float64
}

Sample maintains a statistically-significant selection of values from a stream.

func NewExpDecaySample 

func NewExpDecaySample(reservoirSize int, alpha float64) Sample

NewExpDecaySample constructs a new exponentially-decaying sample with the given reservoir size and alpha.

func NewUniformSample 

func NewUniformSample(reservoirSize int) Sample

NewUniformSample constructs a new uniform sample with the given reservoir size.

type SampleSnapshot 

type SampleSnapshot struct {
	// contains filtered or unexported fields
}

SampleSnapshot is a read-only copy of another Sample.

func NewSampleSnapshot 

func NewSampleSnapshot(count int64, values []int64) *SampleSnapshot

NewSampleSnapshot creates a new instance of SampleSnapshot with the given count and values.

func (*SampleSnapshot) Clear 

func (*SampleSnapshot) Clear()

Clear panics.

func (*SampleSnapshot) Count 

func (s *SampleSnapshot) Count() int64

Count returns the count of inputs at the time the snapshot was taken.

func (*SampleSnapshot) Max 

func (s *SampleSnapshot) Max() int64

Max returns the maximal value at the time the snapshot was taken.

func (*SampleSnapshot) Mean 

func (s *SampleSnapshot) Mean() float64

Mean returns the mean value at the time the snapshot was taken.

func (*SampleSnapshot) Min 

func (s *SampleSnapshot) Min() int64

Min returns the minimal value at the time the snapshot was taken.

func (*SampleSnapshot) Percentile 

func (s *SampleSnapshot) Percentile(p float64) float64

Percentile returns an arbitrary percentile of values at the time the snapshot was taken.

func (*SampleSnapshot) Percentiles 

func (s *SampleSnapshot) Percentiles(ps []float64) []float64

Percentiles returns a slice of arbitrary percentiles of values at the time the snapshot was taken.

func (*SampleSnapshot) Size 

func (s *SampleSnapshot) Size() int

Size returns the size of the sample at the time the snapshot was taken.

func (*SampleSnapshot) Snapshot 

func (s *SampleSnapshot) Snapshot() Sample

Snapshot returns the snapshot.

func (*SampleSnapshot) StdDev 

func (s *SampleSnapshot) StdDev() float64

StdDev returns the standard deviation of values at the time the snapshot was taken.

func (*SampleSnapshot) Sum 

func (s *SampleSnapshot) Sum() int64

Sum returns the sum of values at the time the snapshot was taken.

func (*SampleSnapshot) Update 

func (*SampleSnapshot) Update(int64)

Update panics.

func (*SampleSnapshot) Values 

func (s *SampleSnapshot) Values() []int64

Values returns a copy of the values in the sample.

func (*SampleSnapshot) Variance 

func (s *SampleSnapshot) Variance() float64

Variance returns the variance of values at the time the snapshot was taken.

type StandardCounter 

type StandardCounter struct {
	// contains filtered or unexported fields
}

StandardCounter is the standard implementation of a Counter and uses the sync/atomic package to manage a single int64 value.

func (*StandardCounter) Clear 

func (c *StandardCounter) Clear()

Clear sets the counter to zero.

func (*StandardCounter) Count 

func (c *StandardCounter) Count() int64

Count returns the current count.

func (*StandardCounter) Dec 

func (c *StandardCounter) Dec(i int64)

Dec decrements the counter by the given amount.

func (*StandardCounter) Inc 

func (c *StandardCounter) Inc(i int64)

Inc increments the counter by the given amount.

func (*StandardCounter) Snapshot 

func (c *StandardCounter) Snapshot() Counter

Snapshot returns a read-only copy of the counter.

type StandardEWMA 

type StandardEWMA struct {
	// contains filtered or unexported fields
}

StandardEWMA is the standard implementation of an EWMA.

func (*StandardEWMA) Rate 

func (a *StandardEWMA) Rate() float64

Rate returns the moving average rate of events per second.

func (*StandardEWMA) Snapshot 

func (a *StandardEWMA) Snapshot() EWMA

Snapshot returns a read-only copy of the EWMA.

func (*StandardEWMA) Update 

func (a *StandardEWMA) Update(n int64)

Update registers n events that occured within the last ± 0.5 sec.

type StandardGauge 

type StandardGauge struct {
	// contains filtered or unexported fields
}

StandardGauge is the standard implementation of a Gauge and uses the sync/atomic package to manage a single int64 value.

func (*StandardGauge) Snapshot 

func (g *StandardGauge) Snapshot() Gauge

Snapshot returns a read-only copy of the gauge.

func (*StandardGauge) Update 

func (g *StandardGauge) Update(v int64)

Update updates the gauge's value.

func (*StandardGauge) Value 

func (g *StandardGauge) Value() int64

Value returns the gauge's current value.

type StandardGaugeFloat64 

type StandardGaugeFloat64 struct {
	// contains filtered or unexported fields
}

StandardGaugeFloat64 is the standard implementation of a GaugeFloat64 and uses atomic uint64 (holds float bytes) to manage a single float64 value.

func (*StandardGaugeFloat64) Snapshot 

func (g *StandardGaugeFloat64) Snapshot() GaugeFloat64

Snapshot returns a read-only copy of the gauge.

func (*StandardGaugeFloat64) Update 

func (g *StandardGaugeFloat64) Update(v float64)

Update updates the gauge's value.

func (*StandardGaugeFloat64) Value 

func (g *StandardGaugeFloat64) Value() float64

Value returns the gauge's current value.

type StandardHealthcheck 

type StandardHealthcheck struct {
	// contains filtered or unexported fields
}

StandardHealthcheck is the standard implementation of a Healthcheck and stores the pstatus and a function to call to update the status.

func (*StandardHealthcheck) Check 

func (h *StandardHealthcheck) Check()

Check runs the healthcheck function to update the healthcheck's status.

func (*StandardHealthcheck) Error 

func (h *StandardHealthcheck) Error() error

Error returns the healthcheck's status, which will be nil if it is healthy.

func (*StandardHealthcheck) Healthy 

func (h *StandardHealthcheck) Healthy()

Healthy marks the healthcheck as healthy.

func (*StandardHealthcheck) Unhealthy 

func (h *StandardHealthcheck) Unhealthy(err error)

Unhealthy marks the healthcheck as unhealthy. The error is stored and may be retrieved by the Error method.

type StandardHistogram 

type StandardHistogram struct {
	// contains filtered or unexported fields
}

StandardHistogram is the standard implementation of a Histogram and uses a Sample to bound its memory use.

func (*StandardHistogram) Clear 

func (h *StandardHistogram) Clear()

Clear clears the histogram and its sample.

func (*StandardHistogram) Count 

func (h *StandardHistogram) Count() int64

Count returns the number of samples recorded since the histogram was last cleared.

func (*StandardHistogram) Max 

func (h *StandardHistogram) Max() int64

Max returns the maximum value in the sample.

func (*StandardHistogram) Mean 

func (h *StandardHistogram) Mean() float64

Mean returns the mean of the values in the sample.

func (*StandardHistogram) Min 

func (h *StandardHistogram) Min() int64

Min returns the minimum value in the sample.

func (*StandardHistogram) Percentile 

func (h *StandardHistogram) Percentile(p float64) float64

Percentile returns an arbitrary percentile of the values in the sample.

func (*StandardHistogram) Percentiles 

func (h *StandardHistogram) Percentiles(ps []float64) []float64

Percentiles returns a slice of arbitrary percentiles of the values in the sample.

func (*StandardHistogram) Sample 

func (h *StandardHistogram) Sample() Sample

Sample returns the Sample underlying the histogram.

func (*StandardHistogram) Snapshot 

func (h *StandardHistogram) Snapshot() Histogram

Snapshot returns a read-only copy of the histogram.

func (*StandardHistogram) StdDev 

func (h *StandardHistogram) StdDev() float64

StdDev returns the standard deviation of the values in the sample.

func (*StandardHistogram) Sum 

func (h *StandardHistogram) Sum() int64

Sum returns the sum in the sample.

func (*StandardHistogram) Update 

func (h *StandardHistogram) Update(v int64)

Update samples a new value.

func (*StandardHistogram) Variance 

func (h *StandardHistogram) Variance() float64

Variance returns the variance of the values in the sample.

type StandardMeter 

type StandardMeter struct {
	// contains filtered or unexported fields
}

StandardMeter is the standard implementation of a Meter.

func (*StandardMeter) Count 

func (m *StandardMeter) Count() int64

Count returns the number of events recorded.

func (*StandardMeter) Mark 

func (m *StandardMeter) Mark(n int64)

Mark records the occurance of n events.

func (*StandardMeter) Rate1 

func (m *StandardMeter) Rate1() float64

Rate1 returns the one-minute moving average rate of events per second.

func (*StandardMeter) Rate15 

func (m *StandardMeter) Rate15() float64

Rate15 returns the fifteen-minute moving average rate of events per second.

func (*StandardMeter) Rate5 

func (m *StandardMeter) Rate5() float64

Rate5 returns the five-minute moving average rate of events per second.

func (*StandardMeter) RateMean 

func (m *StandardMeter) RateMean() float64

RateMean returns the meter's mean rate of events per second.

func (*StandardMeter) Snapshot 

func (m *StandardMeter) Snapshot() Meter

Snapshot returns a read-only copy of the meter.

type StandardRegistry 

type StandardRegistry struct {
	// contains filtered or unexported fields
}

StandardRegistry is the standard implementation of a Registry is a mutex-protected map of names to metrics.

func (*StandardRegistry) Each 

func (r *StandardRegistry) Each(f func(string, interface{}))

Each calls the given function for each registered metric.

func (*StandardRegistry) Get 

func (r *StandardRegistry) Get(name string) interface{}

Get the metric by the given name or nil if none is registered.

func (*StandardRegistry) GetAll 

func (r *StandardRegistry) GetAll() map[string]map[string]interface{}

GetAll metrics in the Registry

func (*StandardRegistry) GetOrRegister 

func (r *StandardRegistry) GetOrRegister(name string, i interface{}) interface{}

GetOrRegister gets an existing metric or creates and registers a new one. Threadsafe alternative to calling Get and Register on failure. The interface can be the metric to register if not found in registry, or a function returning the metric for lazy instantiation.

func (*StandardRegistry) MarshalJSON 

func (r *StandardRegistry) MarshalJSON() ([]byte, error)

MarshalJSON returns a byte slice containing a JSON representation of all the metrics in the Registry.

func (*StandardRegistry) Register 

func (r *StandardRegistry) Register(name string, i interface{}) error

Register the given metric under the given name. Returns a DuplicateMetric if a metric by the given name is already registered.

func (*StandardRegistry) RunHealthchecks 

func (r *StandardRegistry) RunHealthchecks()

RunHealthchecks runs all registered healthchecks.

func (*StandardRegistry) SinkOnce 

func (r *StandardRegistry) SinkOnce(name string, i interface{})

SinkOnce stores a metric in the registry that will be returned by Each() only once. It is not accessible via Get() or GetAll() because it is not registered.

func (*StandardRegistry) Unregister 

func (r *StandardRegistry) Unregister(name string)

Unregister the metric with the given name.

func (*StandardRegistry) UnregisterAll 

func (r *StandardRegistry) UnregisterAll()

UnregisterAll unregisters all metrics in the registry. (Mostly for testing.)

type StandardTimer 

type StandardTimer struct {
	// contains filtered or unexported fields
}

StandardTimer is the standard implementation of a Timer and uses a Histogram and Meter.

func (*StandardTimer) Count 

func (t *StandardTimer) Count() int64

Count returns the number of events recorded.

func (*StandardTimer) Max 

func (t *StandardTimer) Max() int64

Max returns the maximum value in the sample.

func (*StandardTimer) Mean 

func (t *StandardTimer) Mean() float64

Mean returns the mean of the values in the sample.

func (*StandardTimer) Min 

func (t *StandardTimer) Min() int64

Min returns the minimum value in the sample.

func (*StandardTimer) Percentile 

func (t *StandardTimer) Percentile(p float64) float64

Percentile returns an arbitrary percentile of the values in the sample.

func (*StandardTimer) Percentiles 

func (t *StandardTimer) Percentiles(ps []float64) []float64

Percentiles returns a slice of arbitrary percentiles of the values in the sample.

func (*StandardTimer) Rate1 

func (t *StandardTimer) Rate1() float64

Rate1 returns the one-minute moving average rate of events per second.

func (*StandardTimer) Rate15 

func (t *StandardTimer) Rate15() float64

Rate15 returns the fifteen-minute moving average rate of events per second.

func (*StandardTimer) Rate5 

func (t *StandardTimer) Rate5() float64

Rate5 returns the five-minute moving average rate of events per second.

func (*StandardTimer) RateMean 

func (t *StandardTimer) RateMean() float64

RateMean returns the meter's mean rate of events per second.

func (*StandardTimer) Snapshot 

func (t *StandardTimer) Snapshot() Timer

Snapshot returns a read-only copy of the timer.

func (*StandardTimer) StdDev 

func (t *StandardTimer) StdDev() float64

StdDev returns the standard deviation of the values in the sample.

func (*StandardTimer) Sum 

func (t *StandardTimer) Sum() int64

Sum returns the sum in the sample.

func (*StandardTimer) Time 

func (t *StandardTimer) Time(f func())

Time records the duration of the execution of the given function.

func (*StandardTimer) Update 

func (t *StandardTimer) Update(d time.Duration)

Update records the duration of an event.

func (*StandardTimer) UpdateSince 

func (t *StandardTimer) UpdateSince(ts time.Time)

UpdateSince record the duration of an event that started at the specified time and ends now.

func (*StandardTimer) Variance 

func (t *StandardTimer) Variance() float64

Variance returns the variance of the values in the sample.

type Stoppable 

type Stoppable interface {
	Stop()
}

Stoppable defines the metrics which has to be stopped.

type Timer 

type Timer interface {
	Count() int64
	Max() int64
	Mean() float64
	Min() int64
	Percentile(float64) float64
	Percentiles([]float64) []float64
	Rate1() float64
	Rate5() float64
	Rate15() float64
	RateMean() float64
	Snapshot() Timer
	StdDev() float64
	Sum() int64
	Time(func())
	Update(time.Duration)
	UpdateSince(time.Time)
	Variance() float64
}

Timer captures the duration and rate of events.

func GetOrRegisterTimer 

func GetOrRegisterTimer(name string, r Registry) Timer

GetOrRegisterTimer returns an existing Timer or constructs and registers a new StandardTimer. Be sure to unregister the meter from the registry once it is of no use to allow for garbage collection.

Example 
m := "account.create.latency"
t := GetOrRegisterTimer(m, nil)
t.Update(47)
fmt.Println(t.Max()) 

Output:

47

func NewCustomTimer 

func NewCustomTimer(h Histogram, m Meter) Timer

NewCustomTimer constructs a new StandardTimer from a Histogram and a Meter.

func NewRegisteredTimer 

func NewRegisteredTimer(name string, r Registry) Timer

NewRegisteredTimer constructs and registers a new StandardTimer. Be sure to unregister the meter from the registry once it is of no use to allow for garbage collection.

func NewTimer 

func NewTimer() Timer

NewTimer constructs a new StandardTimer using an exponentially-decaying sample with the same reservoir size and alpha as UNIX load averages.

type TimerSnapshot 

type TimerSnapshot struct {
	// contains filtered or unexported fields
}

TimerSnapshot is a read-only copy of another Timer.

func (*TimerSnapshot) Count 

func (t *TimerSnapshot) Count() int64

Count returns the number of events recorded at the time the snapshot was taken.

func (*TimerSnapshot) Max 

func (t *TimerSnapshot) Max() int64

Max returns the maximum value at the time the snapshot was taken.

func (*TimerSnapshot) Mean 

func (t *TimerSnapshot) Mean() float64

Mean returns the mean value at the time the snapshot was taken.

func (*TimerSnapshot) Min 

func (t *TimerSnapshot) Min() int64

Min returns the minimum value at the time the snapshot was taken.

func (*TimerSnapshot) Percentile 

func (t *TimerSnapshot) Percentile(p float64) float64

Percentile returns an arbitrary percentile of sampled values at the time the snapshot was taken.

func (*TimerSnapshot) Percentiles 

func (t *TimerSnapshot) Percentiles(ps []float64) []float64

Percentiles returns a slice of arbitrary percentiles of sampled values at the time the snapshot was taken.

func (*TimerSnapshot) Rate1 

func (t *TimerSnapshot) Rate1() float64

Rate1 returns the one-minute moving average rate of events per second at the time the snapshot was taken.

func (*TimerSnapshot) Rate15 

func (t *TimerSnapshot) Rate15() float64

Rate15 returns the fifteen-minute moving average rate of events per second at the time the snapshot was taken.

func (*TimerSnapshot) Rate5 

func (t *TimerSnapshot) Rate5() float64

Rate5 returns the five-minute moving average rate of events per second at the time the snapshot was taken.

func (*TimerSnapshot) RateMean 

func (t *TimerSnapshot) RateMean() float64

RateMean returns the meter's mean rate of events per second at the time the snapshot was taken.

func (*TimerSnapshot) Snapshot 

func (t *TimerSnapshot) Snapshot() Timer

Snapshot returns the snapshot.

func (*TimerSnapshot) StdDev 

func (t *TimerSnapshot) StdDev() float64

StdDev returns the standard deviation of the values at the time the snapshot was taken.

func (*TimerSnapshot) Sum 

func (t *TimerSnapshot) Sum() int64

Sum returns the sum at the time the snapshot was taken.

func (*TimerSnapshot) Time 

func (*TimerSnapshot) Time(func())

Time panics.

func (*TimerSnapshot) Update 

func (*TimerSnapshot) Update(time.Duration)

Update panics.

func (*TimerSnapshot) UpdateSince 

func (*TimerSnapshot) UpdateSince(time.Time)

UpdateSince panics.

func (*TimerSnapshot) Variance 

func (t *TimerSnapshot) Variance() float64

Variance returns the variance of the values at the time the snapshot was taken.

type UniformSample 

type UniformSample struct {
	// contains filtered or unexported fields
}

A UniformSample is a sample using Vitter's Algorithm R. <http://www.cs.umd.edu/~samir/498/vitter.pdf>

func (*UniformSample) Clear 

func (s *UniformSample) Clear()

Clear clears all samples.

func (*UniformSample) Count 

func (s *UniformSample) Count() int64

Count returns the number of samples recorded, which may exceed the reservoir size.

func (*UniformSample) Max 

func (s *UniformSample) Max() int64

Max returns the maximum value in the sample, which may not be the maximum value ever to be part of the sample.

func (*UniformSample) Mean 

func (s *UniformSample) Mean() float64

Mean returns the mean of the values in the sample.

func (*UniformSample) Min 

func (s *UniformSample) Min() int64

Min returns the minimum value in the sample, which may not be the minimum value ever to be part of the sample.

func (*UniformSample) Percentile 

func (s *UniformSample) Percentile(p float64) float64

Percentile returns an arbitrary percentile of values in the sample.

func (*UniformSample) Percentiles 

func (s *UniformSample) Percentiles(ps []float64) []float64

Percentiles returns a slice of arbitrary percentiles of values in the sample.

func (*UniformSample) SetRand 

func (s *UniformSample) SetRand(prng *rand.Rand) Sample

SetRand sets the random source (useful in tests).

func (*UniformSample) Size 

func (s *UniformSample) Size() int

Size returns the size of the sample, which is at most the reservoir size.

func (*UniformSample) Snapshot 

func (s *UniformSample) Snapshot() Sample

Snapshot returns a read-only copy of the sample.

func (*UniformSample) StdDev 

func (s *UniformSample) StdDev() float64

StdDev returns the standard deviation of the values in the sample.

func (*UniformSample) Sum 

func (s *UniformSample) Sum() int64

Sum returns the sum of the values in the sample.

func (*UniformSample) Update 

func (s *UniformSample) Update(v int64)

Update samples a new value.

func (*UniformSample) Values 

func (s *UniformSample) Values() []int64

Values returns a copy of the values in the sample.

func (*UniformSample) Variance 

func (s *UniformSample) Variance() float64

Variance returns the variance of the values in the sample.

Source Files

View all Source files

Directories

Path Synopsis
influxdb
v1
v2

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