func main() {
flag.Parse()
rpc_latency := metrics.NewHistogram(&metrics.HistogramSpecification{
Starts: metrics.EquallySizedBucketsFor(0, 200, 4),
BucketBuilder: metrics.AccumulatingBucketBuilder(metrics.EvictAndReplaceWith(10, maths.Average), 50),
ReportablePercentiles: []float64{0.01, 0.05, 0.5, 0.90, 0.99},
})
rpc_calls := metrics.NewCounter()
metrics := registry.NewRegistry()
metrics.Register("rpc_latency_microseconds", "RPC latency.", registry.NilLabels, rpc_latency)
metrics.Register("rpc_calls_total", "RPC calls.", registry.NilLabels, rpc_calls)
go func() {
for {
rpc_latency.Add(map[string]string{"service": "foo"}, rand.Float64()*200)
rpc_calls.Increment(map[string]string{"service": "foo"})
rpc_latency.Add(map[string]string{"service": "bar"}, (rand.NormFloat64()*10.0)+100.0)
rpc_calls.Increment(map[string]string{"service": "bar"})
rpc_latency.Add(map[string]string{"service": "zed"}, rand.ExpFloat64())
rpc_calls.Increment(map[string]string{"service": "zed"})
time.Sleep(100 * time.Millisecond)
}
}()
exporter := metrics.YieldExporter()
http.Handle("/metrics.json", exporter)
http.ListenAndServe(listeningAddress, nil)
}
)
/*
Boilerplate metrics about the metrics reporting subservice. These are only
exposed if the DefaultRegistry's exporter is hooked into the HTTP request
handler.
*/
var (
marshalErrorCount = metrics.NewCounter()
dumpErrorCount = metrics.NewCounter()
requestCount = metrics.NewCounter()
requestLatencyBuckets = metrics.LogarithmicSizedBucketsFor(0, 1000)
requestLatency = metrics.NewHistogram(&metrics.HistogramSpecification{
Starts: requestLatencyBuckets,
BucketBuilder: metrics.AccumulatingBucketBuilder(metrics.EvictAndReplaceWith(50, maths.Average), 1000),
ReportablePercentiles: []float64{0.01, 0.05, 0.5, 0.9, 0.99},
})
startTime = metrics.NewGauge()
)
func init() {
startTime.Set(nil, float64(time.Now().Unix()))
DefaultRegistry.Register("telemetry_requests_metrics_total", "A counter of the total requests made against the telemetry system.", NilLabels, requestCount)
DefaultRegistry.Register("telemetry_requests_metrics_latency_microseconds", "A histogram of the response latency for requests made against the telemetry system.", NilLabels, requestLatency)
DefaultRegistry.Register("instance_start_time_seconds", "The time at which the current instance started (UTC).", NilLabels, startTime)
}