memmetrics

package
v1.4.2 Latest Latest
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 Go to latest Published: Nov 4, 2022 License: Apache-2.0 Imports: 9 Imported by: 65

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func RTCounter 

func RTCounter(fn NewCounterFn) rrOptSetter

RTCounter set a builder function for Counter.

func RTHistogram 

func RTHistogram(fn NewRollingHistogramFn) rrOptSetter

RTHistogram set a builder function for RollingHistogram.

func SplitFloat64 

func SplitFloat64(threshold, sentinel float64, values []float64) (good map[float64]bool, bad map[float64]bool)

SplitFloat64 provides simple anomaly detection for skewed data sets with no particular distribution. In essence it applies the formula if(v > median(values) + threshold * medianAbsoluteDeviation) -> anomaly There's a corner case where there are just 2 values, so by definition there's no value that exceeds the threshold. This case is solved by introducing additional value that we know is good, e.g. 0. That helps to improve the detection results on such data sets.

func SplitLatencies 

func SplitLatencies(values []time.Duration, precision time.Duration) (good map[time.Duration]bool, bad map[time.Duration]bool)

SplitLatencies provides simple anomaly detection for requests latencies. it splits values into good or bad category based on the threshold and the median value. If all values are not far from the median, it will return all values in 'good' set. Precision is the smallest value to consider, e.g. if set to millisecond, microseconds will be ignored.

func SplitRatios 

func SplitRatios(values []float64) (good map[float64]bool, bad map[float64]bool)

SplitRatios provides simple anomaly detection for ratio values, that are all in the range [0, 1] it splits values into good or bad category based on the threshold and the median value. If all values are not far from the median, it will return all values in 'good' set.

Types

type HDRHistogram 

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

HDRHistogram is a tiny wrapper around github.com/HdrHistogram/hdrhistogram-go that provides convenience functions for measuring http latencies.

func NewHDRHistogram 

func NewHDRHistogram(low, high int64, sigfigs int) (h *HDRHistogram, err error)

NewHDRHistogram creates a new HDRHistogram.

func (*HDRHistogram) Export 

func (h *HDRHistogram) Export() *HDRHistogram

Export export a HDRHistogram.

func (*HDRHistogram) LatencyAtQuantile 

func (h *HDRHistogram) LatencyAtQuantile(q float64) time.Duration

LatencyAtQuantile sets latency at quantile with microsecond precision.

func (*HDRHistogram) Merge 

func (h *HDRHistogram) Merge(other *HDRHistogram) error

Merge merge a HDRHistogram.

func (*HDRHistogram) RecordLatencies 

func (h *HDRHistogram) RecordLatencies(d time.Duration, n int64) error

RecordLatencies Records latencies with microsecond precision.

func (*HDRHistogram) RecordValues 

func (h *HDRHistogram) RecordValues(v, n int64) error

RecordValues sets record values.

func (*HDRHistogram) Reset 

func (h *HDRHistogram) Reset()

Reset reset a HDRHistogram.

func (*HDRHistogram) ValueAtQuantile 

func (h *HDRHistogram) ValueAtQuantile(q float64) int64

ValueAtQuantile sets value at quantile.

type NewCounterFn 

type NewCounterFn func() (*RollingCounter, error)

NewCounterFn builder function type.

type NewRTMetricsFn 

type NewRTMetricsFn func() (*RTMetrics, error)

NewRTMetricsFn builder function type.

type NewRollingHistogramFn 

type NewRollingHistogramFn func() (*RollingHDRHistogram, error)

NewRollingHistogramFn builder function type.

type RTMetrics 

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

RTMetrics provides aggregated performance metrics for HTTP requests processing such as round trip latency, response codes counters network error and total requests. all counters are collected as rolling window counters with defined precision, histograms are a rolling window histograms with defined precision as well. See RTOptions for more detail on parameters.

func NewRTMetrics 

func NewRTMetrics(settings ...rrOptSetter) (*RTMetrics, error)

NewRTMetrics returns new instance of metrics collector.

func (*RTMetrics) Append 

func (m *RTMetrics) Append(other *RTMetrics) error

Append append a metric.

func (*RTMetrics) CounterWindowSize 

func (m *RTMetrics) CounterWindowSize() time.Duration

CounterWindowSize gets total windows size.

func (*RTMetrics) Export 

func (m *RTMetrics) Export() *RTMetrics

Export Returns a new RTMetrics which is a copy of the current one.

func (*RTMetrics) LatencyHistogram 

func (m *RTMetrics) LatencyHistogram() (*HDRHistogram, error)

LatencyHistogram computes and returns resulting histogram with latencies observed.

func (*RTMetrics) NetworkErrorCount 

func (m *RTMetrics) NetworkErrorCount() int64

NetworkErrorCount returns total count of processed requests observed.

func (*RTMetrics) NetworkErrorRatio 

func (m *RTMetrics) NetworkErrorRatio() float64

NetworkErrorRatio calculates the amont of network errors such as time outs and dropped connection that occurred in the given time window compared to the total requests count.

func (*RTMetrics) Record 

func (m *RTMetrics) Record(code int, duration time.Duration)

Record records a metric.

func (*RTMetrics) Reset 

func (m *RTMetrics) Reset()

Reset reset metrics.

func (*RTMetrics) ResponseCodeRatio 

func (m *RTMetrics) ResponseCodeRatio(startA, endA, startB, endB int) float64

ResponseCodeRatio calculates ratio of count(startA to endA) / count(startB to endB).

func (*RTMetrics) StatusCodesCounts 

func (m *RTMetrics) StatusCodesCounts() map[int]int64

StatusCodesCounts returns map with counts of the response codes.

func (*RTMetrics) TotalCount 

func (m *RTMetrics) TotalCount() int64

TotalCount returns total count of processed requests collected.

type RatioCounter 

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

RatioCounter calculates a ratio of a/a+b over a rolling window of predefined buckets.

func NewRatioCounter 

func NewRatioCounter(buckets int, resolution time.Duration, options ...ratioOptSetter) (*RatioCounter, error)

NewRatioCounter creates a new RatioCounter.

func (*RatioCounter) Buckets 

func (r *RatioCounter) Buckets() int

Buckets gets buckets.

func (*RatioCounter) CountA 

func (r *RatioCounter) CountA() int64

CountA gets count A.

func (*RatioCounter) CountB 

func (r *RatioCounter) CountB() int64

CountB gets count B.

func (*RatioCounter) IncA 

func (r *RatioCounter) IncA(v int)

IncA increment counter A.

func (*RatioCounter) IncB 

func (r *RatioCounter) IncB(v int)

IncB increment counter B.

func (*RatioCounter) IsReady 

func (r *RatioCounter) IsReady() bool

IsReady returns true if the counter is ready.

func (*RatioCounter) ProcessedCount 

func (r *RatioCounter) ProcessedCount() int64

ProcessedCount gets processed count.

func (*RatioCounter) Ratio 

func (r *RatioCounter) Ratio() float64

Ratio gets ratio.

func (*RatioCounter) Reset 

func (r *RatioCounter) Reset()

Reset reset the counter.

func (*RatioCounter) Resolution 

func (r *RatioCounter) Resolution() time.Duration

Resolution gets resolution.

func (*RatioCounter) WindowSize 

func (r *RatioCounter) WindowSize() time.Duration

WindowSize gets windows size.

type RollingCounter 

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

RollingCounter Calculates in memory failure rate of an endpoint using rolling window of a predefined size.

func NewCounter 

func NewCounter(buckets int, resolution time.Duration, options ...rcOptSetter) (*RollingCounter, error)

NewCounter creates a counter with fixed amount of buckets that are rotated every resolution period. E.g. 10 buckets with 1 second means that every new second the bucket is refreshed, so it maintains 10 second rolling window. By default creates a bucket with 10 buckets and 1 second resolution.

func (*RollingCounter) Append 

func (c *RollingCounter) Append(o *RollingCounter) error

Append append a counter.

func (*RollingCounter) Buckets 

func (c *RollingCounter) Buckets() int

Buckets gets buckets.

func (*RollingCounter) Clone 

func (c *RollingCounter) Clone() *RollingCounter

Clone clone a counter.

func (*RollingCounter) Count 

func (c *RollingCounter) Count() int64

Count counts.

func (*RollingCounter) CountedBuckets 

func (c *RollingCounter) CountedBuckets() int

CountedBuckets gets counted buckets.

func (*RollingCounter) Inc 

func (c *RollingCounter) Inc(v int)

Inc increment counter.

func (*RollingCounter) Reset 

func (c *RollingCounter) Reset()

Reset reset a counter.

func (*RollingCounter) Resolution 

func (c *RollingCounter) Resolution() time.Duration

Resolution gets resolution.

func (*RollingCounter) WindowSize 

func (c *RollingCounter) WindowSize() time.Duration

WindowSize gets windows size.

type RollingHDRHistogram 

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

RollingHDRHistogram holds multiple histograms and rotates every period. It provides resulting histogram as a result of a call of 'Merged' function.

func NewRollingHDRHistogram 

func NewRollingHDRHistogram(low, high int64, sigfigs int, period time.Duration, bucketCount int, options ...rhOptSetter) (*RollingHDRHistogram, error)

NewRollingHDRHistogram created a new RollingHDRHistogram.

func (*RollingHDRHistogram) Append 

func (r *RollingHDRHistogram) Append(o *RollingHDRHistogram) error

Append append a RollingHDRHistogram.

func (*RollingHDRHistogram) Export 

func (r *RollingHDRHistogram) Export() *RollingHDRHistogram

Export export a RollingHDRHistogram.

func (*RollingHDRHistogram) Merged 

func (r *RollingHDRHistogram) Merged() (*HDRHistogram, error)

Merged gets merged histogram.

func (*RollingHDRHistogram) RecordLatencies 

func (r *RollingHDRHistogram) RecordLatencies(v time.Duration, n int64) error

RecordLatencies sets records latencies.

func (*RollingHDRHistogram) RecordValues 

func (r *RollingHDRHistogram) RecordValues(v, n int64) error

RecordValues set record values.

func (*RollingHDRHistogram) Reset 

func (r *RollingHDRHistogram) Reset()

Reset reset a RollingHDRHistogram.

type TestMeter 

type TestMeter struct {
	Rate       float64
	NotReady   bool
	WindowSize time.Duration
}

TestMeter a test meter.

func (*TestMeter) GetRate 

func (tm *TestMeter) GetRate() float64

GetRate gets rate.

func (*TestMeter) GetWindowSize 

func (tm *TestMeter) GetWindowSize() time.Duration

GetWindowSize gets windows size.

func (*TestMeter) IsReady 

func (tm *TestMeter) IsReady() bool

IsReady returns true if the meter is ready.

Source Files

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