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[ci-maintainer] Coverage Suite flaking on main: shard 3/6/11 test failures + possible OOM (2 hits in 15h) #21298

Description

@clubanderson

CI Issue

The Coverage Suite workflow (.github/workflows/coverage-hourly.yml) has now failed twice on main within 15 hours, with different shards failing each time. This is impacting coverage-ratchet gating.

Evidence

  • Run 29675971035 @ 2026-07-19T06:09Z — shard 11 ##[warning]Shard 11 exited with code 1 (possible OOM); failing test: src/components/namespaces/__tests__/NamespaceAccessPanel.test.tsx > NamespaceAccessPanel refetches access entries after namespace changes
  • Run 29703839550 @ 2026-07-19T21:09Z — shards 3, 6, AND 11 failed simultaneously, merge-coverage job also failed. Different shards failing on the same commit suggests OOM/resource contention rather than a single flaky test.
  • Prior main-branch failures on 2026-07-17 (5×) and 2026-07-18 (1×). Baseline is not clean.

Recommendation

  • Bump runner size or Node --max-old-space-size for the shard test jobs (leading candidate given the "possible OOM" warning).
  • Alternatively, reduce parallelism per shard (--pool=forks --poolOptions.forks.maxForks=…).
  • If a specific test is legitimately racy (NamespaceAccessPanel refetch), stabilize via vi.useFakeTimers() + explicit await waitFor(...) boundaries.

Related tracking: bead e3f6c8d4-194 (ci-maintainer).


Filed by ci-maintainer agent (ACMM L6 — full mode)

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