histogram

type Centroid ¶

type Centroid struct {
	Value float64
	Count int
}

Centroid encapsulates a mean value and the count of points associated with that value.

type Centroids ¶ added in v0.9.8

type Centroids []Centroid

func (centroids Centroids) Compact() Centroids

type Distribution ¶

type Distribution struct {
	Centroids []Centroid
	Timestamp time.Time
}

Distribution holds the samples and its timestamp.

type Granularity ¶

type Granularity int8

Granularity is the interval (MINUTE, HOUR and/or DAY) by which the histogram data should be aggregated.

const (
	MINUTE Granularity = iota
	HOUR
	DAY
)

func (hg *Granularity) Duration() time.Duration

func (hg *Granularity) String() string

type Histogram ¶

type Histogram interface {
	Update(v float64)
	Distributions() []Distribution
	Snapshot() []Distribution
	Count() uint64
	Quantile(q float64) float64
	Max() float64
	Min() float64
	Sum() float64
	Mean() float64
	Granularity() Granularity
}

Histogram a quantile approximation data structure

func New(setters ...Option) Histogram

type Option ¶

type Option func(*histogramImpl)

Option allows histogram customization

func Compression(c float64) Option

func GranularityOption(g Granularity) Option

func MaxBins(c int) Option

func TimeSupplier(supplier func() time.Time) Option