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feat(go): expose kafka consumer lag metrics

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lingniu
2026-07-02 19:23:01 +08:00
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docs/ops/go-service-observability.md
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@@ -40,6 +40,9 @@ curl -fsS http://127.0.0.1:20200/readyz
| `vehicle_history_writes_total` | TDengine history writes. Labels: `topic`, `status`. |
| `vehicle_stat_writes_total` | MySQL metric writes. Labels: `topic`, `status`. |
| `vehicle_realtime_updates_total` | Redis/MySQL realtime projector updates. Labels: `topic`, `status`. |
| `vehicle_history_kafka_lag` | Estimated Kafka lag for history writer by topic and partition. |
| `vehicle_stat_kafka_lag` | Estimated Kafka lag for stat writer by topic and partition. |
| `vehicle_realtime_kafka_lag` | Estimated Kafka lag for realtime projector by topic and partition. |
## First Principle