- Fixed numerous bugs across UI, CLI, executor, task mapping, and DAG parsing (e.g., env‑var masking, XCom handling, deadlock with mapped tasks).
- Added features like XComArgs support for ExternalTaskSensor, setters for MappedOperator callbacks, custom pickling hooks for LazyXComAccess, and a SIGUSR2 handler for debugging.
Apache Airflow 2.5.1
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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.