feat: 支持环境变量控制 Prometheus metrics

internal/api/admin/start.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"strings"
 	"syscall"
 	"time"
 
@@ -26,6 +27,7 @@ import (
 	"github.com/openimsdk/tools/system/program"
 	"github.com/openimsdk/tools/utils/datautil"
 	"github.com/openimsdk/tools/utils/runtimeenv"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 	clientv3 "go.etcd.io/etcd/client/v3"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
@@ -81,6 +83,24 @@ func Start(ctx context.Context, index int, config *Config) error {
 		}
 		c.Next()
 	})
+	
+	// 可选的 Prometheus metrics 端点
+	// 支持配置文件或环境变量控制（环境变量优先）
+	prometheusEnable := config.AdminAPI.Prometheus.Enable
+	if envEnable := os.Getenv("PROMETHEUS_ENABLE"); envEnable != "" {
+		prometheusEnable = strings.ToLower(envEnable) == "true" || envEnable == "1"
+	}
+	if prometheusEnable {
+		metricsPath := config.AdminAPI.Prometheus.Path
+		if envPath := os.Getenv("PROMETHEUS_PATH"); envPath != "" {
+			metricsPath = envPath
+		}
+		if metricsPath == "" {
+			metricsPath = "/metrics"
+		}
+		engine.GET(metricsPath, gin.WrapH(promhttp.Handler()))
+	}
+
 	SetAdminRoute(engine, adminApi, mwApi, config, client)
 
 	if config.Discovery.Enable == kdisc.ETCDCONST {