ubuntu-latest Rollout: Teams Urged to Turn Isolation Tests into Pin, Move, or Fix Decisions

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The ubuntu-latest migration window runs from October 19 to November 19, 2026, during which the default label shifts from Ubuntu 24.04 to 26.04 in stages, so individual runs may use either image. A guide for Day 10 argues that a test isolating the image from the code is only useful once it produces a decision: a failure on both labels is a normal bug, a failure on one label confirms drift and requires pinning or moving the job, and a pass on both suggests the original failure was rollout noise. Pinned jobs should record a revisit date after the window closes, and moved jobs should keep the original failing step and error line as evidence. The guide also warns that macOS 14 labels retire on November 2, 2026, meaning affected jobs will fail outright rather than drift. The author reports that repeated scans of workflow files through October 26 showed no changes yet, with no migration-effect rows observed.

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