Respond to a failing CI build in a way that protects the mainline and feedback loop.
red mainline The CI build for main has failed for 46 minutes. A release branch is due at noon, and new merges keep landing. If red becomes normal, CI stops being feedback and becomes decoration. Continuous Integration Keep mainline releasable CI works when every integration gets fast automated feedback and the team treats broken mainline as urgent shared work. Ignore Assume local green is enough. The shared branch becomes trustworthy again. The mainline is a team asset. Protect its signal before adding more change. 01 Stop 02 Isolate 03 Restore protect signal Two PRs are approved and waiting to merge.
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