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feat(go): expose gateway connection close metrics

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lingniu
2026-07-03 19:28:06 +08:00
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docs/ops/go-vehicle-ingest-memory.md
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@@ -409,6 +409,16 @@ vehicle_async_sink_queue_depth{sink}
这些指标是进入带帧率压测前的关键保护栏：如果 `queue_depth` 持续增长、`enqueue_total{status="timeout"}` 增长，或 `vehicle_async_sink_publish_duration_ms_histogram_bucket` 的 p99 持续上升，说明入口 publish 队列或下游 NATS/Kafka 写入已成为瓶颈。
### Gateway connection close reason
2026-07-03 已为 TCP gateway 增加连接关闭原因计数：
```text
vehicle_gateway_connection_closes_total{protocol,reason}
```
当前 `reason` 包括 `eof`、`read_timeout`、`read_error`、`extract_error`、`context_cancelled`、`max_connections`。10W 长连接和带帧率压测时，应重点关注 `read_error`、`extract_error`、`max_connections` 是否异常增长；`read_timeout` 需要结合协议上报周期和在线数判断。
### NATS fast writer stage histogram
2026-07-03 已为 NATS fast writer 增加阶段耗时 histogram：