Golang 框架性能监控指南：打造高效应用程序

package main

import (
    "log"
    "net/http"
    "time"

    "github.com/prometheus/client_golang/prometheus"
    "github.com/prometheus/client_golang/prometheus/promhttp"
)

func main() {
    // 定义计数器和直方图指标
    requestCounter := prometheus.NewCounterVec(
        prometheus.CounterOpts{
            Name: "http_request_total",
            Help: "Total number of HTTP requests",
        },
        []string{"method", "path"},
    )

    requestLatency := prometheus.NewHistogramVec(
        prometheus.HistogramOpts{
            Name:    "http_request_latency_seconds",
            Help:    "Latency distribution of HTTP requests in seconds",
            Buckets: []float64{0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0},
        },
        []string{"method", "path"},
    )

    // 注册指标
    prometheus.MustRegister(requestCounter, requestLatency)

    // 为每个请求记录指标
    nextHandler := func(handler http.Handler) http.Handler {
        return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
            startTime := time.Now()

            handler.ServeHTTP(w, r)

            requestCounter.WithLabelValues(r.Method, r.URL.Path).Inc()
            requestLatency.WithLabelValues(r.Method, r.URL.Path).Observe(time.Since(startTime).Seconds())
        })
    }

    // 启动 HTTP 服务器并提供 Prometheus 指标
    http.Handle("/metrics", promhttp.Handler())
    http.HandleFunc("/", nextHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("Hello World!"))
    })))

    if err := http.ListenAndServe(":8080", nil); err != nil {
        log.Fatal(err)
    }
}