- Raw HTML in DAG docs and params is disabled by default and controlled via `webserver.allow_raw_html_descriptions`, deprecating the custom HTML form for security.
- Introduces many new features: Airflow ObjectStore, XCom tab in Grid, literal wrapper to disable templating, task context logging, dataset listener hooks, PythonVirtualenv enhancements, UI improvements, and more.
- Contains extensive bug fixes, documentation updates, dependency upgrades, and deprecations such as lazy import of AirflowException.
Apache Airflow 2.8.0
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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.