Raise Cloud Run request concurrency from 4 to 6#3758
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anth-volk
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July 21, 2026 19:05
Cloud Run's autoscaler targets ~60% of containerConcurrency, so c4 spawns a new instance at ~2.4 sustained concurrent requests — overnight bot bursts churned 18 instance boots on 2026-07-21, each queueing requests behind the ~3-min import. c6 moves the trigger to ~3.6 while staying within the memory envelope (c8 OOM'd in Stage 2; c6 re-qualified by soak, evidence in docs/migration/history/pr4-stage2-runtime-timing.md). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
30-min 12-client cache-busted soak against no-traffic c6-qual revision: memory p99 peaked 61% (bar 70%; c8 failed at 92%), zero OOM/worker restarts, 320/320 requests 200. Gates evaluated server-side (client-side JSON lost to an operator session exit at soak end — informational only). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Fixes #3761
Summary
CLOUD_RUN_CONCURRENCYdefault 4 → 6 (.github/scripts/cloud_run_env.sh), invariant test updatedWEB_CONCURRENCY=2unchangedQualification
Draft until the 30-min c6 soak (12 clients, cache-busted, against a no-traffic
c6-qualrevision) passes its gates: memory p95 < 70%, zero OOM, zero 5xx. Evidence will be appended todocs/migration/history/pr4-stage2-runtime-timing.mdbefore marking ready. (Stage 2 rejected c8 after a worker OOM at 92% memory; concurrency changes require their own soak.)🤖 Generated with Claude Code