feat(go): expose runtime ingest metrics

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

@@ -17,6 +17,7 @@ import (
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/eventbus"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/identity"
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/metrics"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/protocol/yutongmqtt"
 )
 
@@ -38,6 +39,7 @@ type MQTTClientConfig struct {
 	Sink                    eventbus.Sink
 	Resolver                identity.Resolver
 	Logger                  *slog.Logger
+	Metrics                 *metrics.Registry
 }
 
 type MQTTClient struct {
@@ -208,14 +210,41 @@ func (c *MQTTClient) handleMessage(ctx context.Context, topic string, payload []
 			env = resolved
 		}
 	}
+	c.recordFrameMetric(env.ParseStatus)
 	if err := c.cfg.Sink.PublishRaw(messageCtx, env); err != nil {
+		c.recordPublishMetric("raw", "error")
 		c.cfg.Logger.Error("publish mqtt raw failed", "topic", topic, "event_id", env.StableEventID(), "error", err)
 		return
 	}
+	c.recordPublishMetric("raw", "ok")
 	if env.ParseStatus == envelope.ParseBadFrame {
 		return
 	}
 	if err := c.cfg.Sink.PublishUnified(messageCtx, env); err != nil {
+		c.recordPublishMetric("unified", "error")
 		c.cfg.Logger.Error("publish mqtt unified failed", "topic", topic, "event_id", env.StableEventID(), "error", err)
+		return
 	}
+	c.recordPublishMetric("unified", "ok")
+}
+
+func (c *MQTTClient) recordFrameMetric(status envelope.ParseStatus) {
+	if c.cfg.Metrics == nil {
+		return
+	}
+	c.cfg.Metrics.IncCounter("vehicle_gateway_frames_total", metrics.Labels{
+		"protocol": string(envelope.ProtocolYutongMQTT),
+		"status":   string(status),
+	})
+}
+
+func (c *MQTTClient) recordPublishMetric(kind string, status string) {
+	if c.cfg.Metrics == nil {
+		return
+	}
+	c.cfg.Metrics.IncCounter("vehicle_gateway_publish_total", metrics.Labels{
+		"protocol": string(envelope.ProtocolYutongMQTT),
+		"kind":     kind,
+		"status":   status,
+	})
 }