feat: make service_name configurable through environment variable (#3589

)

Co-authored-by: Anton Kolesnikov <anton.e.kolesnikov@gmail.com>

pkg/phlare/phlare.go

@@ -326,7 +326,11 @@ func New(cfg Config) (*Phlare, error) {
 
 	if cfg.Tracing.Enabled {
 		// Setting the environment variable JAEGER_AGENT_HOST enables tracing
-		trace, err := wwtracing.NewFromEnv(fmt.Sprintf("pyroscope-%s", cfg.Target))
+		name := os.Getenv("JAEGER_SERVICE_NAME")
+		if name == "" {
+			name = fmt.Sprintf("pyroscope-%s", cfg.Target)
+		}
+		trace, err := wwtracing.NewFromEnv(name)
 		if err != nil {
 			level.Error(logger).Log("msg", "error in initializing tracing. tracing will not be enabled", "err", err)
 		}