- Fix premature evaluation of tasks in mapped task groups and resolve scheduler crash loops when dagrun creation fails
- Add missing TriggerRule value in REST API and improve read‑only field validation for task instances
- Update documentation: variable substitution, connection examples, deprecation notes, and other minor fixes
Apache Airflow 2.7.3
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Updated XCom handling for pandas 3, now storing the class name; all components must be upgraded or DataFrames from pandas 3 become unreadable.