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Cian Johnston
4b585465b8
Adds production-observability metrics to coderd/x/chatd/ for
model-level correlation and a chatStreams memory-leak investigation.
- Label per-request chatd metrics (steps_total, message_count,
prompt_size_bytes, tool_result_size_bytes, ttft_seconds,
compaction_total) with `model` and enrich the per-turn logger
with provider/model.
- Add `coderd_chatd_stream_retries_total{provider, model, kind}`
counter incremented in chatloop before OnRetry.
- Register a prometheus.Collector exposing `streams_active`,
`stream_buffer_size_max`, `stream_buffer_events`,
`stream_subscribers` from p.chatStreams.
- Add `coderd_chatd_stream_buffer_dropped_total` counter,
incremented per publishToStream drop independently of the
existing log-rate-limited bufferDropCount.
- Snapshot logger/model before the title-generation goroutine to
avoid a data race with the logger/model rebind below it.
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