Add example

Makefile

@@ -11,3 +11,6 @@ lint:
 	@golangci-lint version
 	@golangci-lint config verify
 	@golangci-lint run
+
+run:
+	@go run example/main.go

example/main.go

@@ -0,0 +1,62 @@
+//nolint:sloglint,noctx
+package main
+
+import (
+	"log/slog"
+	_ "net/http/pprof"
+
+	"github.com/vmkteam/appkit"
+
+	"github.com/labstack/echo/v4"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/vmkteam/zenrpc/v2"
+)
+
+const appName = "apisrv"
+
+func main() {
+	version := appkit.Version()
+	slog.Info("app started", "app", appName, "version", version, "addr", "http://localhost:8080")
+
+	// create echo server
+	e := appkit.NewEcho()
+	e.Use(appkit.HTTPMetrics(appName))
+
+	md := registerMetadata()
+
+	e.Any("/debug/pprof/*", appkit.PprofHandler)
+	e.GET("/debug/metadata", md.Handler)
+	e.GET("/metrics", echo.WrapHandler(promhttp.Handler()))
+	e.GET("/v1/rpc/doc/", appkit.EchoHandlerFunc(zenrpc.SMDBoxHandler))
+	e.GET("/", appkit.RenderRoutes(appName, e))
+
+	// register metadata as metrics
+	md.RegisterMetrics()
+
+	// HTTP headers for client requests
+	httpHeaders := appkit.NewInternalHeaders(appName, version)
+	_ = httpHeaders
+
+	// start echo
+	if err := e.Start(":8080"); err != nil {
+		slog.Error("http server exited", "err", err.Error())
+	}
+}
+
+// registerMetadata creates metadata manager with service metadata.
+func registerMetadata() *appkit.MetadataManager {
+	return appkit.NewMetadataManager(appkit.MetadataOpts{
+		DBs: []appkit.DBMetadata{
+			appkit.NewDBMetadata("master", 5, false),
+			appkit.NewDBMetadata("replica", 1, true),
+		},
+		HasPublicAPI:      true,
+		HasPrivateAPI:     false,
+		HasBrokersrvQueue: false,
+		HasCronJobs:       false,
+		Services: []appkit.ServiceMetadata{
+			appkit.NewServiceMetadata("yandex", appkit.MetadataServiceTypeExternal),
+			appkit.NewServiceMetadata("apisrv", appkit.MetadataServiceTypeAsync),
+		},
+	})
+}