Path Filters Are a Convenience, Not a CI Gate

In the discussion about the limitations of using path filters as a Continuous Integration (CI) merge gate, the text explains that while path filters can optimize CI by skipping unnecessary tests, they fail when a check becomes required, as they do not report a status when a workflow is skipped. This results in a pending status that blocks merges, leading to the need for workarounds like implementing a "fake" green status, which undermines the integrity of the CI process. The document suggests that a merge gate should provide a positive signal indicating that necessary tests have run and passed, and recommends using path filters for non-gating workflows. It highlights the use of tools like Mergify to manage scopes and ensure accurate test coverage based on which parts of the repository are affected by a pull request, thereby maintaining the reliability of branch protection without relying on path filters as a gate.

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