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[RCA] Post-merge regression scan 2026-05-24 #1761

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opened 2026-05-24 01:46:14 +00:00 by agent-researcher · 0 comments
agent-researcher commented 2026-05-24 01:46:14 +00:00
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MECHANISM: I scanned the requested merged PRs (#1719, #1714, #1680, #1703, #1697, #1728, #1745, #1743, #1744, #1748, #1756) against subsequent molecule-core issues/PRs updated after their merge window. No later fix/PR body I found cites any of those PRs as a post-merge regression cause or as a revert target. Two main-red watchdog issues landed near this window, but their follow-up diagnoses point elsewhere: #1741 fired while main HEAD was #1728's merge commit, then #1743 says the root cause was empty PR branches with head.sha == base.sha; #1757 fired after #1751, which was not in the requested PR set.

EVIDENCE: Merge metadata: #1728 merged at 2026-05-23T21:01:09Z (436fae8949b2); #1743 at 2026-05-23T21:56:43Z; #1744 at 21:57:42Z; #1745 at 21:55:42Z; #1748 at 22:20:26Z; #1756 at 2026-05-24T01:04:31Z. #1743 explicitly says “Root cause of #1741” was empty PRs #1709/#1710/#1712/#1702, not #1728. #1748 is a rows.Err audit follow-up and mentions PR #1743 only as an audit reference, not as a regression cause. No commit message since 2026-05-23T19:45Z contains a revert for the requested PRs.

RECOMMENDED FIX SHAPE: No code fix is indicated from this pass. Keep #1741/#1743 classified as CI status-attachment fallout, not a #1728 functional regression. Keep #1748 classified as a forward audit fix, not a regression introduced by #1743. Closing this RCA issue as no confirmed post-merge regressions detected for the requested 11 PRs.

MECHANISM: I scanned the requested merged PRs (#1719, #1714, #1680, #1703, #1697, #1728, #1745, #1743, #1744, #1748, #1756) against subsequent molecule-core issues/PRs updated after their merge window. No later fix/PR body I found cites any of those PRs as a post-merge regression cause or as a revert target. Two main-red watchdog issues landed near this window, but their follow-up diagnoses point elsewhere: #1741 fired while main HEAD was #1728's merge commit, then #1743 says the root cause was empty PR branches with `head.sha == base.sha`; #1757 fired after #1751, which was not in the requested PR set. EVIDENCE: Merge metadata: #1728 merged at 2026-05-23T21:01:09Z (`436fae8949b2`); #1743 at 2026-05-23T21:56:43Z; #1744 at 21:57:42Z; #1745 at 21:55:42Z; #1748 at 22:20:26Z; #1756 at 2026-05-24T01:04:31Z. #1743 explicitly says “Root cause of #1741” was empty PRs #1709/#1710/#1712/#1702, not #1728. #1748 is a rows.Err audit follow-up and mentions PR #1743 only as an audit reference, not as a regression cause. No commit message since 2026-05-23T19:45Z contains a `revert` for the requested PRs. RECOMMENDED FIX SHAPE: No code fix is indicated from this pass. Keep #1741/#1743 classified as CI status-attachment fallout, not a #1728 functional regression. Keep #1748 classified as a forward audit fix, not a regression introduced by #1743. Closing this RCA issue as no confirmed post-merge regressions detected for the requested 11 PRs.
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Reference: molecule-ai/molecule-core#1761
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