feat(metrics): moved back the metrics endpoint to support the undocumented functionality

backend/pkg/metrics/server.go

@@ -1,10 +1,38 @@
 package metrics
 
 import (
+	"context"
+	"net/http"
+
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+
 	"openreplay/backend/pkg/logger"
 )
 
-type MetricServer struct{}
+type MetricServer struct {
+	registry *prometheus.Registry
+}
 
-func New(log logger.Logger, cs []prometheus.Collector) {}
+func New(log logger.Logger, cs []prometheus.Collector) {
+	registry := prometheus.NewRegistry()
+	// Add go runtime metrics and process collectors.
+	registry.MustRegister(
+		collectors.NewGoCollector(),
+		collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
+	)
+	// Add extra metrics
+	registry.MustRegister(cs...)
+	// Expose /metrics HTTP endpoint using the created custom registry.
+	http.Handle(
+		"/metrics", promhttp.HandlerFor(
+			registry,
+			promhttp.HandlerOpts{
+				EnableOpenMetrics: true,
+			}),
+	)
+	go func() {
+		log.Error(context.Background(), "%v", http.ListenAndServe(":8888", nil))
+	}()
+}

ee/backend/pkg/metrics/server.go

@@ -1,38 +0,0 @@
-package metrics
-
-import (
-	"context"
-	"net/http"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/collectors"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-
-	"openreplay/backend/pkg/logger"
-)
-
-type MetricServer struct {
-	registry *prometheus.Registry
-}
-
-func New(log logger.Logger, cs []prometheus.Collector) {
-	registry := prometheus.NewRegistry()
-	// Add go runtime metrics and process collectors.
-	registry.MustRegister(
-		collectors.NewGoCollector(),
-		collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
-	)
-	// Add extra metrics
-	registry.MustRegister(cs...)
-	// Expose /metrics HTTP endpoint using the created custom registry.
-	http.Handle(
-		"/metrics", promhttp.HandlerFor(
-			registry,
-			promhttp.HandlerOpts{
-				EnableOpenMetrics: true,
-			}),
-	)
-	go func() {
-		log.Error(context.Background(), "%v", http.ListenAndServe(":8888", nil))
-	}()
-}