feat(go): expose runtime ingest metrics

go/vehicle-gateway/internal/health/health.go

@@ -7,6 +7,8 @@ import (
 	"net/http"
 	"strings"
 	"time"
+
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/metrics"
 )
 
 type Check struct {
@@ -32,22 +34,25 @@ func NewHandler(service string, checks []Check) *Handler {
 	return &Handler{service: service, checks: checks}
 }
 
-func NewMux(service string, checks []Check) *http.ServeMux {
+func NewMux(service string, checks []Check, registry *metrics.Registry) *http.ServeMux {
 	mux := http.NewServeMux()
 	handler := NewHandler(service, checks)
 	mux.Handle("/healthz", handler)
 	mux.Handle("/readyz", handler)
+	if registry != nil {
+		mux.Handle("/metrics", metrics.NewHandler(registry))
+	}
 	return mux
 }
 
-func NewServer(addr string, service string, checks []Check) *http.Server {
+func NewServer(addr string, service string, checks []Check, registry *metrics.Registry) *http.Server {
 	addr = strings.TrimSpace(addr)
 	if addr == "" {
 		return nil
 	}
 	return &http.Server{
 		Addr:              addr,
-		Handler:           NewMux(service, checks),
+		Handler:           NewMux(service, checks, registry),
 		ReadHeaderTimeout: 5 * time.Second,
 	}
 }