feat: 支持环境变量控制 Prometheus metrics

internal/api/chat/start.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"strings"
 	"syscall"
 	"time"
 
@@ -25,6 +26,7 @@ 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"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
 )
@@ -74,6 +76,24 @@ func Start(ctx context.Context, index int, cfg *Config) error {
 	gin.SetMode(gin.ReleaseMode)
 	engine := gin.New()
 	engine.Use(gin.Recovery(), mw.CorsHandler(), mw.GinParseOperationID())
+
+	// 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 := cfg.ApiConfig.Prometheus.Enable
+	if envEnable := os.Getenv("PROMETHEUS_ENABLE"); envEnable != "" {
+		prometheusEnable = strings.ToLower(envEnable) == "true" || envEnable == "1"
+	}
+	if prometheusEnable {
+		metricsPath := cfg.ApiConfig.Prometheus.Path
+		if envPath := os.Getenv("PROMETHEUS_PATH"); envPath != "" {
+			metricsPath = envPath
+		}
+		if metricsPath == "" {
+			metricsPath = "/metrics"
+		}
+		engine.GET(metricsPath, gin.WrapH(promhttp.Handler()))
+	}
+
 	SetChatRoute(engine, adminApi, mwApi)
 
 	var (