feat: add switch PrometheusEnabled

Author: fatelei

.env.example

@@ -136,6 +136,9 @@ LOG_OUTPUT_FORMAT=text
 # pprof enabled, for debugging
 PPROF_ENABLED=false
 
+# prometheus metrics enabled
+PROMETHEUS_ENABLED=true
+
 # FORCE_VERIFYING_SIGNATURE, for security, you should set this to true, pls be sure you know what you are doing
 # if want to install plugin without verifying signature, set this to false
 FORCE_VERIFYING_SIGNATURE=true

internal/server/http_server.go

@@ -33,16 +33,20 @@ func (app *App) server(config *app.Config) func() {
 	engine.NoRoute(func(c *gin.Context) {
 		c.JSON(http.StatusNotFound, gin.H{"code": "not_found", "message": "route not found"})
 	})
-	engine.Use(PrometheusMiddleware())
+	if config.PrometheusEnabled {
+		engine.Use(PrometheusMiddleware())
+	}
 	engine.GET("/health/check", controllers.HealthCheck(config))
 
 	endpointGroup := engine.Group("/e")
 	serverlessTransactionGroup := engine.Group("/backwards-invocation")
 	pluginGroup := engine.Group("/plugin/:tenant_id")
 	pprofGroup := engine.Group("/debug/pprof")
 
-	metricsGroup := engine.Group("/metrics")
-	metricsGroup.GET("/", gin.WrapH(promhttp.Handler()))
+	if config.PrometheusEnabled {
+		metricsGroup := engine.Group("/metrics")
+		metricsGroup.GET("/", gin.WrapH(promhttp.Handler()))
+	}
 
 	if config.AdminApiEnabled {
 		if len(config.AdminApiKey) < 10 {

internal/types/app/config.go

@@ -194,6 +194,8 @@ type Config struct {
 
 	PPROFEnabled bool `envconfig:"PPROF_ENABLED"`
 
+	PrometheusEnabled bool `envconfig:"PROMETHEUS_ENABLED" default:"true"`
+
 	SentryEnabled          bool    `envconfig:"SENTRY_ENABLED"`
 	SentryDSN              string  `envconfig:"SENTRY_DSN"`
 	SentryAttachStacktrace bool    `envconfig:"SENTRY_ATTACH_STACKTRACE"`