- Adds asset partitioning for fine‑grained scheduling, experimental multi‑team deployments, and synchronous deadline callbacks.
- Improves UI performance (grid virtualization, XCom edit, HITL history, Gantt updates) and adds a scheduler `--only-idle` flag and structured JSON logging option.
- Breaking changes: TI summary endpoint replaced by NDJSON stream, retry exponential backoff schema now numeric, serializers and task exceptions moved to the SDK (deprecation warnings), and removal of legacy OTel trace metaclass.
Apache Airflow 3.2.0
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Expanded asset partitioning with new RollupMapper, FanOutMapper, FixedKeyMapper, SegmentWindow and runtime timetable support for dynamic partition keys.
✅ SMTP STARTTLS now validates server certificates by default; set `email.ssl_context="none"` to retain previous non‑validating behavior.