The GitHub Actions job "Tests (ARM)" on airflow.git/main has failed.
Run started by GitHub user potiuk (triggered by potiuk).

Head commit for run:
97e90643dbf1ae12a4411c4bc822cbd54eeb4d8d / Jarek Potiuk <[email protected]>
Document selective-checks algorithm and heuristics (#68116)

Expand dev/breeze/doc/ci/04_selective_checks.md with a "why and how"
explanation of selective checks: the optimisation goal, the design
assumptions (changed files as a risk proxy, conservative-when-in-doubt,
trust earned on main), and a mental model of events -> run mode ->
file-group matches -> outputs.

Add Mermaid diagrams for the decision pipeline (run-mode selection, the
full_tests_needed short-circuit ladder, mode -> jobs, test-type
selection), a table of individually-simple file->effect rules, worked
examples for pull requests / pushes / release-branch pushes / canary
runs, and a troubleshooting section for "my CI run does too much".

Refresh the existing decision-rules list to match current behaviour
(release-branch and only-text PUSH exceptions, API-contract vs API-source
distinction). Add an AGENTS.md rule to keep selective_checks.py and this
doc in sync.

Co-authored-by: Claude Opus 4.8 (1M context) <[email protected]>

Report URL: https://github.com/apache/airflow/actions/runs/27052897933

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