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[v3-4-test] Expose task instance loop pass and expansion size to listeners (#75132) - #75309
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…eners (apache#75132) A single event about a task instance should be enough to tell which execution it describes: which loop pass and rerun of the loop it ran in, how many instances its mapped expansion has, and why a loop gate stopped. Workers only had the loop iteration, a mapped task inside a loop could not be tied to the pass it ran in, reruns could only be ordered by comparing region ids from two events, and server side consumers such as listeners had to read region rows to place a stored task instance. (cherry picked from commit e6a2c9f) Co-authored-by: Claude <noreply@anthropic.com>
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Backport of #75132 to
v3-4-test. The automatic backport failed because #75260 wasn't merged yet; with it in, this is a clean cherry-pick of the commit merged tomain.Was generative AI tooling used to co-author this PR?
Generated-by: Claude Code (Opus 5.5) following the guidelines
{pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.🤖 Generated with Claude Code