add metrics http exporter

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

cmd/servicechecker/main.go

@@ -8,12 +8,18 @@ import (
 	"time"
 
 	grpccli "go.unistack.org/micro-client-grpc/v3"
+	jsoncodec "go.unistack.org/micro-codec-json/v3"
 	jsonpbcodec "go.unistack.org/micro-codec-jsonpb/v3"
 	protocodec "go.unistack.org/micro-codec-proto/v3"
 	victoriametrics "go.unistack.org/micro-meter-victoriametrics/v3"
+	httpsrv "go.unistack.org/micro-server-http/v3"
+	healthhandler "go.unistack.org/micro-server-http/v3/handler/health"
+	meterhandler "go.unistack.org/micro-server-http/v3/handler/meter"
 	"go.unistack.org/micro/v3/client"
 	"go.unistack.org/micro/v3/logger/slog"
+	"go.unistack.org/micro/v3/meter"
 	"go.unistack.org/micro/v3/semconv"
+	"go.unistack.org/micro/v3/server"
 	"go.unistack.org/servicechecker/pkg/config"
 	"go.unistack.org/servicechecker/pkg/grpcconn"
 	"go.unistack.org/servicechecker/pkg/scheduler"
@@ -29,7 +35,11 @@ func main() {
 
 	l := slog.NewLogger()
 	l.Init()
-	m := victoriametrics.NewMeter()
+	m := victoriametrics.NewMeter(
+		victoriametrics.PrometheusCompat(true),
+		meter.WriteFDMetrics(true),
+		meter.WriteProcessMetrics(true),
+	)
 	f, err := os.Open("config.yaml")
 	if err != nil {
 		l.Fatal(ctx, "failed to open config", err)
@@ -58,6 +68,26 @@ func main() {
 		}
 	}()
 
+	s := httpsrv.NewServer(
+		server.Codec("application/json", jsoncodec.NewCodec()),
+		server.Address(cfg.Meter.Addr),
+	)
+
+	if err = s.Init(); err != nil {
+		l.Fatal(ctx, "http server init error", err)
+	}
+
+	if err := healthhandler.RegisterHealthServiceServer(s, healthhandler.NewHandler()); err != nil {
+		l.Fatal(ctx, "failed to set http handler", err)
+	}
+	if err := meterhandler.RegisterMeterServiceServer(s, meterhandler.NewHandler(meterhandler.Meter(m))); err != nil {
+		l.Fatal(ctx, "failed to set http handler", err)
+	}
+
+	if err = s.Start(); err != nil {
+		l.Fatal(ctx, "failed to start http server", err)
+	}
+
 	clients := make(map[string]client.Client)
 	gcli := grpccli.NewClient(
 		client.Codec("application/json", jsonpbcodec.NewCodec()),