metrics

package
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 Go to latest Published: May 31, 2017 License: Apache-2.0 Imports: 17 Imported by: 0

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Constants

This section is empty.

Variables

View Source 
var (
	M_Instance_Start                       Counter
	M_Page_Status_200                      Counter
	M_Page_Status_500                      Counter
	M_Page_Status_404                      Counter
	M_Page_Status_Unknown                  Counter
	M_Api_Status_200                       Counter
	M_Api_Status_404                       Counter
	M_Api_Status_500                       Counter
	M_Api_Status_Unknown                   Counter
	M_Proxy_Status_200                     Counter
	M_Proxy_Status_404                     Counter
	M_Proxy_Status_500                     Counter
	M_Proxy_Status_Unknown                 Counter
	M_Api_User_SignUpStarted               Counter
	M_Api_User_SignUpCompleted             Counter
	M_Api_User_SignUpInvite                Counter
	M_Api_Dashboard_Save                   Timer
	M_Api_Dashboard_Get                    Timer
	M_Api_Dashboard_Search                 Timer
	M_Api_Admin_User_Create                Counter
	M_Api_Login_Post                       Counter
	M_Api_Login_OAuth                      Counter
	M_Api_Org_Create                       Counter
	M_Api_Dashboard_Snapshot_Create        Counter
	M_Api_Dashboard_Snapshot_External      Counter
	M_Api_Dashboard_Snapshot_Get           Counter
	M_Models_Dashboard_Insert              Counter
	M_Alerting_Result_State_Alerting       Counter
	M_Alerting_Result_State_Ok             Counter
	M_Alerting_Result_State_Paused         Counter
	M_Alerting_Result_State_NoData         Counter
	M_Alerting_Result_State_Pending        Counter
	M_Alerting_Notification_Sent_Slack     Counter
	M_Alerting_Notification_Sent_Email     Counter
	M_Alerting_Notification_Sent_Webhook   Counter
	M_Alerting_Notification_Sent_PagerDuty Counter
	M_Alerting_Notification_Sent_LINE      Counter
	M_Alerting_Notification_Sent_Victorops Counter
	M_Alerting_Notification_Sent_OpsGenie  Counter
	M_Alerting_Notification_Sent_Telegram  Counter
	M_Alerting_Notification_Sent_Threema   Counter
	M_Alerting_Notification_Sent_Sensu     Counter
	M_Alerting_Notification_Sent_Pushover  Counter
	M_Aws_CloudWatch_GetMetricStatistics   Counter
	M_Aws_CloudWatch_ListMetrics           Counter

	// Timers
	M_DataSource_ProxyReq_Timer Timer
	M_Alerting_Execution_Time   Timer

	// StatTotals
	M_Alerting_Active_Alerts Gauge
	M_StatTotal_Dashboards   Gauge
	M_StatTotal_Users        Gauge
	M_StatTotal_Orgs         Gauge
	M_StatTotal_Playlists    Gauge
)
View Source 
var UseNilMetrics bool

Functions

func Init 

func Init()

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

SamplePercentiles 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.

Types

type Counter 

type Counter interface {
	Metric

	Clear()
	Count() int64
	Dec(int64)
	Inc(int64)
}

Counters hold an int64 value that can be incremented and decremented.

func NewCounter 

func NewCounter(meta *MetricMeta) Counter

NewCounter constructs a new StandardCounter.

func RegCounter 

func RegCounter(name string, tagStrings ...string) Counter

type EWMA 

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

EWMAs continuously calculate an exponentially-weighted moving average based on an outside source of clock ticks.

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) Tick 

func (EWMASnapshot) Tick()

Tick panics.

func (EWMASnapshot) Update 

func (EWMASnapshot) Update(int64)

Update panics.

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://www.research.att.com/people/Cormode_Graham/library/publications/CormodeShkapenyukSrivastavaXu09.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) 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 Gauge 

type Gauge interface {
	Metric

	Update(int64)
	Value() int64
}

Gauges hold an int64 value that can be set arbitrarily.

func NewGauge 

func NewGauge(meta *MetricMeta) Gauge

func RegGauge 

func RegGauge(name string, tagStrings ...string) Gauge

type GaugeSnapshot 

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

GaugeSnapshot is a read-only copy of another Gauge.

func (GaugeSnapshot) Snapshot 

func (g GaugeSnapshot) Snapshot() Metric

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 GraphitePublisher 

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

func CreateGraphitePublisher 

func CreateGraphitePublisher() (*GraphitePublisher, error)

func (*GraphitePublisher) Publish 

func (this *GraphitePublisher) Publish(metrics []Metric)

type Histogram 

type Histogram interface {
	Metric

	Clear()
	Count() int64
	Max() int64
	Mean() float64
	Min() int64
	Percentile(float64) float64
	Percentiles([]float64) []float64
	StdDev() float64
	Sum() int64
	Update(int64)
	Variance() float64
}

Histograms calculate distribution statistics from a series of int64 values.

func NewHistogram 

func NewHistogram(meta *MetricMeta, s Sample) Histogram

type HistogramSnapshot 

type HistogramSnapshot struct {
	*MetricMeta
	// 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() Metric

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 {
	Metric

	Count() int64
	Mark(int64)
	Rate1() float64
	Rate5() float64
	Rate15() float64
	RateMean() float64
}

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

func NewMeter 

func NewMeter(meta *MetricMeta) Meter

NewMeter constructs a new StandardMeter and launches a goroutine.

type MeterSnapshot 

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

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() Metric

Snapshot returns the snapshot.

type Metric 

type Metric interface {
	Name() string
	GetTagsCopy() map[string]string
	StringifyTags() string
	Snapshot() Metric
}

type MetricMeta 

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

func NewMetricMeta 

func NewMetricMeta(name string, tagStrings []string) *MetricMeta

func (*MetricMeta) GetTagsCopy 

func (m *MetricMeta) GetTagsCopy() map[string]string

func (*MetricMeta) Name 

func (m *MetricMeta) Name() string

func (*MetricMeta) StringifyTags 

func (m *MetricMeta) StringifyTags() string

type MetricPublisher 

type MetricPublisher interface {
	Publish(metrics []Metric)
}

type MetricSettings 

type MetricSettings struct {
	Enabled         bool
	IntervalSeconds int64

	Publishers []MetricPublisher
}

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{ *MetricMeta }

NilGauge is a no-op Gauge.

func (NilGauge) Snapshot 

func (NilGauge) Snapshot() Metric

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 NilHistogram 

type NilHistogram struct {
	*MetricMeta
}

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 (n NilHistogram) Snapshot() Metric

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{ *MetricMeta }

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

Rate15is 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() Metric

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

Sample 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 {
	*MetricMeta
	// contains filtered or unexported fields
}

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 (n NilTimer) Snapshot() Metric

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 Registry 

type Registry interface {
	GetSnapshots() []Metric
	Register(metric Metric)
}
var MetricStats Registry

func NewRegistry 

func NewRegistry() Registry

Create 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
}

Samples maintain 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 (*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 {
	*MetricMeta
	// 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() Metric

type StandardEWMA 

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

StandardEWMA is the standard implementation of an EWMA and tracks the number of uncounted events and processes them on each tick. It uses the sync/atomic package to manage uncounted events.

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) Tick 

func (a *StandardEWMA) Tick()

Tick ticks the clock to update the moving average. It assumes it is called every five seconds.

func (*StandardEWMA) Update 

func (a *StandardEWMA) Update(n int64)

Update adds n uncounted events.

type StandardGauge 

type StandardGauge struct {
	*MetricMeta
	// 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. atomic needs 64-bit aligned memory which is ensure for first word

func (*StandardGauge) Snapshot 

func (g *StandardGauge) Snapshot() Metric

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 StandardHistogram 

type StandardHistogram struct {
	*MetricMeta
	// 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() Metric

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 {
	*MetricMeta
	// 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() Metric

Snapshot returns a read-only copy of the meter.

type StandardRegistry 

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

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

func (*StandardRegistry) GetSnapshots 

func (r *StandardRegistry) GetSnapshots() []Metric

Call the given function for each registered metric.

func (*StandardRegistry) Register 

func (r *StandardRegistry) Register(metric Metric)

type StandardTimer 

type StandardTimer struct {
	*MetricMeta
	// 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() Metric

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())

Record the duration of the execution of the given function.

func (*StandardTimer) Update 

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

Record the duration of an event.

func (*StandardTimer) UpdateSince 

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

Record the duration of an event that started at a time and ends now.

func (*StandardTimer) Variance 

func (t *StandardTimer) Variance() float64

Variance returns the variance of the values in the sample.

type Timer 

type Timer interface {
	Metric

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

Timers capture the duration and rate of events.

func NewCustomTimer 

func NewCustomTimer(meta *MetricMeta, h Histogram, m Meter) Timer

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

func NewTimer 

func NewTimer(meta *MetricMeta) Timer

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

func RegTimer 

func RegTimer(name string, tagStrings ...string) Timer

type TimerSnapshot 

type TimerSnapshot struct {
	*MetricMeta
	// 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() Metric

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 uniform 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) 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.

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