feat(go): improve realtime pipeline resilience

go/vehicle-gateway/internal/gateway/mqtt_client.go

@@ -179,6 +179,12 @@ func (c *MQTTClient) buildTLSConfig() (*tls.Config, error) {
 }
 
 func (c *MQTTClient) handleMessage(ctx context.Context, topic string, payload []byte) {
+	started := time.Now()
+	frameStatus := envelope.ParseBadFrame
+	defer func() {
+		c.recordFrameDuration(frameStatus, time.Since(started))
+	}()
+
 	messageCtx, cancelMessage := context.WithTimeout(context.WithoutCancel(ctx), frameOperationTimeout)
 	defer cancelMessage()
 
@@ -214,6 +220,7 @@ func (c *MQTTClient) handleMessage(ctx context.Context, topic string, payload []
 			c.recordIdentityMetric(identityStatus(env))
 		}
 	}
+	frameStatus = env.ParseStatus
 	c.recordFrameMetric(env.ParseStatus)
 	if err := c.cfg.Sink.PublishRaw(messageCtx, env); err != nil {
 		c.recordPublishMetric("raw", "error")
@@ -252,6 +259,16 @@ func (c *MQTTClient) recordFrameMetric(status envelope.ParseStatus) {
 	})
 }
 
+func (c *MQTTClient) recordFrameDuration(status envelope.ParseStatus, elapsed time.Duration) {
+	if c.cfg.Metrics == nil {
+		return
+	}
+	c.cfg.Metrics.SetGauge("vehicle_gateway_frame_duration_ms", metrics.Labels{
+		"protocol": string(envelope.ProtocolYutongMQTT),
+		"status":   string(status),
+	}, float64(elapsed.Milliseconds()))
+}
+
 func (c *MQTTClient) recordPublishMetric(kind string, status string) {
 	if c.cfg.Metrics == nil {
 		return