- Added CI on Travis with coverage reports and full Python 2/3 compatibility via future imports
- Introduced MesosExecutor, Kerberos integration for Hive/Hadoop, UI enhancements (graph view legend toggles, expanded Mark Success options), new hooks (OracleHook, FTPHook, MySQL bulk load using mysqlclient)
- Switched to Gunicorn for WSGI, added automated zombie task cleanup, and delivered numerous bug fixes and usability improvements
v1.5.2
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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.