Kratos 監(jiān)控

監(jiān)控

Metrics 中間件用于實現(xiàn)服務(wù)的性能指標監(jiān)控，統(tǒng)計了請求耗時和請求計數(shù)。

配置

Metrics 中間件中提供了兩個配置方法 ?WithSeconds()? 和 ?WithRequests()?。

• ?WithSeconds()?

func WithSeconds(c metrics.Observer) Option {
    return func(o *options) {
        o.seconds = c
    }
}

用于設(shè)置 metrics 中間件統(tǒng)計請求耗時的 ?Observer ?直方圖。

• ?WithRequests() ?

func WithRequests(c metrics.Counter) Option {
    return func(o *options) {
        o.requests = c
    }
}

用于設(shè)置 metrics 中間件統(tǒng)計請求計數(shù)的 ?Counter ?計數(shù)器。

使用方式

使用 prometheus

// https://github.com/go-kratos/examples/tree/main/metrics
_metricSeconds = prometheus.NewHistogramVec(prometheus.HistogramOpts{
    Namespace: "server",
    Subsystem: "requests",
    Name:      "duration_ms",
    Help:      "server requests duration(ms).",
    Buckets:   []float64{5, 10, 25, 50, 100, 250, 500, 1000},
}, []string{"kind", "operation"})

_metricRequests = prometheus.NewCounterVec(prometheus.CounterOpts{
    Namespace: "client",
    Subsystem: "requests",
    Name:      "code_total",
    Help:      "The total number of processed requests",
}, []string{"kind", "operation", "code", "reason"})
    
prometheus.MustRegister(_metricSeconds, _metricRequests)

httpSrv.Handle("/metrics", promhttp.Handler())

Server 中使用 metrics

// grpc sever
grpcSrv := grpc.NewServer(
    grpc.Address(":9000"),
    grpc.Middleware(
        metrics.Server(
            metrics.WithSeconds(prom.NewHistogram(_metricSeconds)),
            metrics.WithRequests(prom.NewCounter(_metricRequests)),
        ),
    ),
)

// http server
httpSrv := http.NewServer(
    http.Address(":8000"),
    http.Middleware(
        metrics.Server(
            metrics.WithSeconds(prom.NewHistogram(_metricSeconds)),
            metrics.WithRequests(prom.NewCounter(_metricRequests)),
        ),
    ),
)

Client 中使用 metrics

// grpc client
conn, err := grpc.DialInsecure(
    context.Background(),
    grpc.WithEndpoint("127.0.0.1:9000"),
    grpc.WithMiddleware(
        metrics.Client(
            metrics.WithSeconds(prom.NewHistogram(_metricSeconds)),
            metrics.WithRequests(prom.NewCounter(_metricRequests)),
        ),
    ),
)

// http client
conn, err := http.NewClient(
    context.Background(),
    http.WithEndpoint("127.0.0.1:8000"),
    http.WithMiddleware(
        metrics.Client(
            metrics.WithSeconds(prom.NewHistogram(_metricSeconds)),
            metrics.WithRequests(prom.NewCounter(_metricRequests)),
        ),
    ),
)