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feat(go): expose fast writer stage latency histogram

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lingniu
2026-07-03 19:12:58 +08:00
parent 07d17e5adf
commit 2db05d100d
6 changed files with 79 additions and 7 deletions
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docs/ops/go-vehicle-ingest-memory.md
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@@ -409,6 +409,18 @@ 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。
### NATS fast writer stage histogram
2026-07-03 已为 NATS fast writer 增加阶段耗时 histogram：
```text
vehicle_fast_writer_stage_duration_ms_histogram_bucket{subject,stage,status,le}
vehicle_fast_writer_stage_duration_ms_histogram_count{subject,stage,status}
vehicle_fast_writer_stage_duration_ms_histogram_sum{subject,stage,status}
```
`stage` 取值包括 `tdengine`、`redis`、`ack`，分别对应快速写 TDengine raw/location、Redis realtime 投影、NATS ack。带帧率压测时如果某个 stage 的 p99 持续上升，可以直接定位 fast path 是存储瓶颈还是 ack/网络瓶颈。
### NATS Kafka bridge batch 指标
2026-07-03 已为 NATS -> Kafka bridge 增加 batch pending 和 duration histogram：