metrics

package

v1.0.2 Latest Latest Go to latest Published: Jul 10, 2026 License: Apache-2.0 Imports: 4 Imported by: 0

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Valid go.mod file
Redistributable license
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Stable version
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Repository

github.com/rulego/streamsql

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Documentation ¶

Index ¶

Variables
type Counter
- func NewCounter(name string) *Counter
type Gauge
- func NewGauge(name string) *Gauge
type Histogram
- func NewHistogram(name string, buckets []time.Duration) *Histogram
type HistogramSnapshot
type Metric
type Registry
- func NewRegistry() *Registry

Constants ¶

This section is empty.

Variables ¶

View Source

var DefaultLatencyBuckets = []time.Duration{
	10 * time.Microsecond,
	100 * time.Microsecond,
	500 * time.Microsecond,
	time.Millisecond,
	5 * time.Millisecond,
	10 * time.Millisecond,
	50 * time.Millisecond,
	100 * time.Millisecond,
	time.Second,
}

Functions ¶

This section is empty.

Types ¶

type Counter ¶

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

Counter is a monotonically increasing counter.

func NewCounter ¶

func NewCounter(name string) *Counter

func (*Counter) Inc ¶

func (c *Counter) Inc()

func (*Counter) IncBy ¶

func (c *Counter) IncBy(delta int64)

func (*Counter) Name ¶

func (c *Counter) Name() string

func (*Counter) Reset ¶

func (c *Counter) Reset()

func (*Counter) SnapshotValue ¶

func (c *Counter) SnapshotValue() any

func (*Counter) Value ¶

func (c *Counter) Value() int64

type Gauge ¶

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

Gauge is a settable signed value.

func NewGauge ¶

func NewGauge(name string) *Gauge

func (*Gauge) Dec ¶

func (g *Gauge) Dec(n int64)

func (*Gauge) Inc ¶

func (g *Gauge) Inc(n int64)

func (*Gauge) Name ¶

func (g *Gauge) Name() string

func (*Gauge) Set ¶

func (g *Gauge) Set(v int64)

func (*Gauge) SnapshotValue ¶

func (g *Gauge) SnapshotValue() any

func (*Gauge) Value ¶

func (g *Gauge) Value() int64

type Histogram ¶

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

Histogram records the distribution of durations into fixed upper-bound buckets.

func NewHistogram ¶

func NewHistogram(name string, buckets []time.Duration) *Histogram

func (*Histogram) Name ¶

func (h *Histogram) Name() string

func (*Histogram) Observe ¶

func (h *Histogram) Observe(d time.Duration)

Observe records d, incrementing every bucket whose upper bound >= d.

func (*Histogram) Percentile ¶

func (h *Histogram) Percentile(q float64) time.Duration

Percentile returns the approximate duration at quantile q (0..1).

func (*Histogram) Reset ¶

func (h *Histogram) Reset()

func (*Histogram) Snapshot ¶

func (h *Histogram) Snapshot() HistogramSnapshot

func (*Histogram) SnapshotValue ¶

func (h *Histogram) SnapshotValue() any

type HistogramSnapshot ¶

type HistogramSnapshot struct {
	Name    string           `json:"name"`
	Count   int64            `json:"count"`
	Sum     time.Duration    `json:"sum"`
	Min     time.Duration    `json:"min"`
	Max     time.Duration    `json:"max"`
	Avg     time.Duration    `json:"avg"`
	Buckets map[string]int64 `json:"buckets"` // upper bound -> cumulative count
}

type Metric ¶

type Metric interface {
	Name() string
	SnapshotValue() any
}

Metric is implemented by all registry instruments.

type Registry ¶

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

Registry is a named collection of metrics.

func NewRegistry ¶

func NewRegistry() *Registry

func (*Registry) Counter ¶

func (r *Registry) Counter(name string) *Counter

Counter returns the Counter by name, creating it if absent.

func (*Registry) Gauge ¶

func (r *Registry) Gauge(name string) *Gauge

Gauge returns the Gauge by name, creating it if absent.

func (*Registry) Get ¶

func (r *Registry) Get(name string) (Metric, bool)

func (*Registry) Histogram ¶

func (r *Registry) Histogram(name string) *Histogram

Histogram returns the Histogram by name, creating it with default buckets if absent. For custom buckets, build with NewHistogram and pass to Register.

func (*Registry) Names ¶

func (r *Registry) Names() []string

Names returns the sorted names of all registered metrics.

func (*Registry) Register ¶

func (r *Registry) Register(m Metric)

Register stores m under its name, replacing any prior metric with that name.

func (*Registry) Snapshot ¶

func (r *Registry) Snapshot() map[string]any

Snapshot returns name -> snapshot value for every registered metric.

Source Files ¶

View all Source files

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