Add chat completion concurrency logging#733
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Summary
Adds sampled per-instance concurrency logging around
/api/v1/chat/completionsso Render incidents can be correlated with active streaming request pressure.The helper tracks every request in-process, logs sampled start/finish pairs with duration and end reason, and keeps streaming requests counted until completion, cancellation, or error.
This should make it easier to decide whether permanently increasing instance count is enough or whether stream concurrency needs dedicated autoscaling.
Validation
bun run typecheckfromweb/bun test web/src/app/api/v1/chat/completions/__tests__/completions.test.ts web/src/app/api/v1/chat/completions/__tests__/request-metrics.test.ts