- Introduced data‑aware scheduling, new TaskFlow decorators (e.g., @task.short_circuit, @task.kubernetes) and expanded task‑mapping APIs (expand_kwargs, map semantics, XComArg.zip).
- Added UI and CLI enhancements such as grid logs for mapped tasks, auto‑refresh on DAG home, DAG‑parser stdout logging, and new REST endpoints for clearing DAG runs and task instances.
- Fixed numerous bugs (backfill deadlock, graph view recursion errors, scheduler logging, secrets‑backend caching) and removed deprecated modules while updating documentation.
Apache Airflow 2.4.0
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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.