// Package multi provides adapters that send observations to multiple metrics // simultaneously. This is useful if your service needs to emit to multiple // instrumentation systems at the same time, for example if your organization is // transitioning from one system to another. package multi import "github.com/go-kit/kit/metrics" // Counter collects multiple individual counters and treats them as a unit. type Counter []metrics.Counter // NewCounter returns a multi-counter, wrapping the passed counters. func NewCounter(c ...metrics.Counter) Counter { return Counter(c) } // Add implements counter. func (c Counter) Add(delta float64) { for _, counter := range c { counter.Add(delta) } } // With implements counter. func (c Counter) With(labelValues ...string) metrics.Counter { next := make(Counter, len(c)) for i := range c { next[i] = c[i].With(labelValues...) } return next } // Gauge collects multiple individual gauges and treats them as a unit. type Gauge []metrics.Gauge // NewGauge returns a multi-gauge, wrapping the passed gauges. func NewGauge(g ...metrics.Gauge) Gauge { return Gauge(g) } // Set implements Gauge. func (g Gauge) Set(value float64) { for _, gauge := range g { gauge.Set(value) } } // With implements gauge. func (g Gauge) With(labelValues ...string) metrics.Gauge { next := make(Gauge, len(g)) for i := range g { next[i] = g[i].With(labelValues...) } return next } // Add implements metrics.Gauge. func (g Gauge) Add(delta float64) { for _, gauge := range g { gauge.Add(delta) } } // Histogram collects multiple individual histograms and treats them as a unit. type Histogram []metrics.Histogram // NewHistogram returns a multi-histogram, wrapping the passed histograms. func NewHistogram(h ...metrics.Histogram) Histogram { return Histogram(h) } // Observe implements Histogram. func (h Histogram) Observe(value float64) { for _, histogram := range h { histogram.Observe(value) } } // With implements histogram. func (h Histogram) With(labelValues ...string) metrics.Histogram { next := make(Histogram, len(h)) for i := range h { next[i] = h[i].With(labelValues...) } return next }