- Metrics for scheduled and queued duration are now emitted in milliseconds, aligning with StatsD conventions
- OpenTelemetry metrics support is promoted from experimental to stable, becoming a core feature
- Various bug fixes, documentation updates, and deprecations (e.g., PostgresOperator, FAB permissions configs) across UI, DAG handling, and backend)
Apache Airflow 2.9.3
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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.