Tree Sheriff
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The rotating on-call role responsible for keeping the Chromium continuous integration tree “green” (all automated tests passing). The Tree Sheriff monitors the build console, reverts changes that cause test failures without waiting for the original author, and maintains a tree-open or tree-closed status that gates further commits. The pattern names the rotation cadence (typically one week per assignment), the authority to revert without author permission, the escalation path for persistent failures, and the gardening work of marking known-flaky tests.