基本介绍

框架内置了 Go 基础指标，默认情况下是关闭的，需要手动开启，可以通过创建 Provider 时通过 otelmetric.WithBuiltInMetrics() 参数开启。

package main
import (
    "go.opentelemetry.io/otel/exporters/prometheus"
    "github.com/gogf/gf/contrib/metric/otelmetric/v2"
    "github.com/gogf/gf/v2/frame/g"
    "github.com/gogf/gf/v2/os/gctx"
    "github.com/gogf/gf/v2/os/gmetric"
)
const (
    instrument        = "github.com/gogf/gf/example/metric/basic"
    instrumentVersion = "v1.0"
)
var (
    meter = gmetric.GetGlobalProvider().Meter(gmetric.MeterOption{
        Instrument:        instrument,
        InstrumentVersion: instrumentVersion,
    })
    counter = meter.MustCounter(
        "goframe.metric.demo.counter",
        gmetric.MetricOption{
            Help: "This is a simple demo for Counter usage",
            Unit: "bytes",
        },
    )
)
func main() {
    var ctx = gctx.New()
    // Prometheus exporter to export metrics as Prometheus format.
    exporter, err := prometheus.New(
        prometheus.WithoutCounterSuffixes(),
        prometheus.WithoutUnits(),
    )
    if err != nil {
        g.Log().Fatal(ctx, err)
    }
    // OpenTelemetry provider.
    provider := otelmetric.MustProvider(
        otelmetric.WithReader(exporter),
        otelmetric.WithBuiltInMetrics(),
    )
    provider.SetAsGlobal()
    defer provider.Shutdown(ctx)
    // Counter.
    counter.Inc(ctx)
    counter.Add(ctx, 10)
    // HTTP Server for metrics exporting.
    otelmetric.StartPrometheusMetricsServer(8000, "/metrics")
}

执行后，访问 http://127.0.0.1:8000/metrics 查看结果。

内置指标说明