distribution/vendor/github.com/docker/go-metrics/gauge.go
tifayuki e3c37a46e2 Add Prometheus Metrics
at the first iteration, only the following metrics are collected:

  - HTTP metrics of each API endpoint
  - cache counter for request/hit/miss
  - histogram of storage actions, including:
    GetContent, PutContent, Stat, List, Move, and Delete

Signed-off-by: tifayuki <tifayuki@gmail.com>
2018-02-09 14:27:51 -08:00

72 lines
1.3 KiB
Go

package metrics
import "github.com/prometheus/client_golang/prometheus"
// Gauge is a metric that allows incrementing and decrementing a value
type Gauge interface {
Inc(...float64)
Dec(...float64)
// Add adds the provided value to the gauge's current value
Add(float64)
// Set replaces the gauge's current value with the provided value
Set(float64)
}
// LabeledGauge describes a gauge the must have values populated before use.
type LabeledGauge interface {
WithValues(labels ...string) Gauge
}
type labeledGauge struct {
pg *prometheus.GaugeVec
}
func (lg *labeledGauge) WithValues(labels ...string) Gauge {
return &gauge{pg: lg.pg.WithLabelValues(labels...)}
}
func (lg *labeledGauge) Describe(c chan<- *prometheus.Desc) {
lg.pg.Describe(c)
}
func (lg *labeledGauge) Collect(c chan<- prometheus.Metric) {
lg.pg.Collect(c)
}
type gauge struct {
pg prometheus.Gauge
}
func (g *gauge) Inc(vs ...float64) {
if len(vs) == 0 {
g.pg.Inc()
}
g.Add(sumFloat64(vs...))
}
func (g *gauge) Dec(vs ...float64) {
if len(vs) == 0 {
g.pg.Dec()
}
g.Add(-sumFloat64(vs...))
}
func (g *gauge) Add(v float64) {
g.pg.Add(v)
}
func (g *gauge) Set(v float64) {
g.pg.Set(v)
}
func (g *gauge) Describe(c chan<- *prometheus.Desc) {
g.pg.Describe(c)
}
func (g *gauge) Collect(c chan<- prometheus.Metric) {
g.pg.Collect(c)
}