Go 使用 prometheus

import (
    "github.com/prometheus/client_golang/prometheus"
)

counter := prometheus.NewCounter(prometheus.CounterOpts{
    Name:       "rpc_durations_seconds",
            Help:       "RPC latency distributions.",
            Objectives: map[string]string{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
})