go-metrics/log.go

package metrics

import (
	"log"
	"time"
)

// Output each metric in the given registry periodically using the given
// logger.  The interval is to be given in seconds.
func Log(r Registry, interval int, l *log.Logger) {
	for {
		r.EachCounter(func(name string, c Counter) {
			l.Printf("counter %s\n", name)
			l.Printf("  count:       %9d\n", c.Count())
		})
		r.EachGauge(func(name string, g Gauge) {
			l.Printf("gauge %s\n", name)
			l.Printf("  value:       %9d\n", g.Value())
		})
		r.RunHealthchecks()
		r.EachHealthcheck(func(name string, h Healthcheck) {
			l.Printf("healthcheck %s\n", name)
			l.Printf("  error:       %v\n", h.Error())
		})
		r.EachHistogram(func(name string, h Histogram) {
			ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
			l.Printf("histogram %s\n", name)
			l.Printf("  count:       %9d\n", h.Count())
			l.Printf("  min:         %9d\n", h.Min())
			l.Printf("  max:         %9d\n", h.Max())
			l.Printf("  mean:        %12.2f\n", h.Mean())
			l.Printf("  stddev:      %12.2f\n", h.StdDev())
			l.Printf("  median:      %12.2f\n", ps[0])
			l.Printf("  75%%:         %12.2f\n", ps[1])
			l.Printf("  95%%:         %12.2f\n", ps[2])
			l.Printf("  99%%:         %12.2f\n", ps[3])
			l.Printf("  99.9%%:       %12.2f\n", ps[4])
		})
		r.EachMeter(func(name string, m Meter) {
			l.Printf("meter %s\n", name)
			l.Printf("  count:       %9d\n", m.Count())
			l.Printf("  1-min rate:  %12.2f\n", m.Rate1())
			l.Printf("  5-min rate:  %12.2f\n", m.Rate5())
			l.Printf("  15-min rate: %12.2f\n", m.Rate15())
			l.Printf("  mean rate:   %12.2f\n", m.RateMean())
		})
		r.EachTimer(func(name string, t Timer) {
			ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
			l.Printf("timer %s\n", name)
			l.Printf("  count:       %9d\n", t.Count())
			l.Printf("  min:         %9d\n", t.Min())
			l.Printf("  max:         %9d\n", t.Max())
			l.Printf("  mean:        %12.2f\n", t.Mean())
			l.Printf("  stddev:      %12.2f\n", t.StdDev())
			l.Printf("  median:      %12.2f\n", ps[0])
			l.Printf("  75%%:         %12.2f\n", ps[1])
			l.Printf("  95%%:         %12.2f\n", ps[2])
			l.Printf("  99%%:         %12.2f\n", ps[3])
			l.Printf("  99.9%%:       %12.2f\n", ps[4])
			l.Printf("  1-min rate:  %12.2f\n", t.Rate1())
			l.Printf("  5-min rate:  %12.2f\n", t.Rate5())
			l.Printf("  15-min rate: %12.2f\n", t.Rate15())
			l.Printf("  mean rate:   %12.2f\n", t.RateMean())
		})
		time.Sleep(int64(1e9) * int64(interval))
	}
}