- Fixed critical stability bugs including scheduler crashes, slow DAG deletion, task deadlocks, and session handling issues
- Added new features such as a database‑backed session store, remote‑user mode user creation, and permission‑based viewing of DagRuns and task instances
- Enhanced documentation (logical date, variable precedence, XCom, upgrade guides) and deprecated smart sensors and experimental API functions
Apache Airflow 2.2.4
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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.