- Listener API methods are now stable for production and many new features are added, including dataset URI validation, multi‑executor configuration, Matomo analytics, bulk pause/resume CLI, and extensive UI/Audit Log enhancements.
- Microsoft SQL Server is removed as a supported metadata database; XCom column type changes to LONGBLOB and a 4096‑character limit on rendered template fields introduce breaking migration steps.
- Python 3.12 is officially supported with an increased minimum SQLAlchemy version, while several providers still lack 3.12 compatibility.
Apache Airflow 2.9.0
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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.