Fix task execution failures with large data by improving internal communication protocol (#51924, #53194)
Fix reschedule sensors failing after multiple re-queue attempts over long periods (#52706)
Improve xcom_pull to cover different scenarios for mapped tasks (#51568)
Fix connection retrieval failures in triggerer when schema field is used (#52691)
Add back user impersonation (run_as_user) support for task execution (#51780)
Fix DAG version not updating when bundle name changes without DAG structure changes (#51939)
Add back exception to context for task callbacks (#52066)
Fix task log retrieval for retry attempts showing incorrect logs (#51592)
Fix data interval handling for DAGs created before AIP-39 during serialization (#51913)
Fix lingering task supervisors when EOF is missed (#51180) (#51970)
Persist EventsTimetable's description during serialization (#51926)
Delete import error when a dag bundle becomes inactive (#51921)
Cleanup import errors during DB migration (#51919)
Fix EOF detection of subprocesses in Dag Processor (#51895)
Stop streaming task logs if end of log mark is missing (#51482)
Allow more empty loops before stopping log streaming (#52624)
Fix Jinja2 Template deep copy error with dag.test (#51673)
Explicitly close log file descriptor in the supervise function (#51654)
Improve structured logging format and layout (#51567) (#51626)
Use Connection Hook Names for Dropdown instead of connection IDs (#51613)
Add back config setting to control exposing stacktrace (#51617)
Fix task level alias resolution in structure endpoint (#51579)
Fix backfill creation to include DAG run configuration from form (#51584)
Fix structure edges in API responses (#51489)
Make dag.test consistent with airflow dags test CLI command (#51476)
Fix downstream asset attachment at task level in structure endpoint (#51425)
Fix Task Instance No Status Filter (#52154)
UI: Fix backfill creation to respect run backwards setting from form (#52168)
UI: Set downstream option to default on task instance clear (#52246)
UI: Enable iframe script execution (#52568)
UI: Fix DAG tags filter not showing all tags in UI when tags are greater than 50 (#52714)
UI: Add real-time clock updates to timezone selector (#52414)
Improve Grid view performance and responsiveness with optimized data loading (#52718,#52822,#52919)
Fix editing connection with sensitive extra field (#52445)
Fix archival for cascading deletes by archiving dependent tables first (#51952)
Fix whitespace handling in DAG owners parsing for multiple owners (#52221)
Fix SQLite migration from 2.7.0 to 3.0.0 (#51431)
Fix http exception when ti not found for extra links API (#51465)
Fix Starting from Trigger when using MappedOperator (#52681)
Add ti information to re-queue logs (#49995)
Task SDK: Fix AssetEventOperations.get to use alias_name when specified (#52324)
Ensure trigger kwargs are properly deserialized during trigger execution (#52721)
Fixing bad cadwyn migration for upstream map indexes (#52797)
Run trigger expansion logic only when start_from_trigger is True (#52873)
Fix example dag example_external_task_parent_deferrable.py imports (#52957)
Fixes pagination in DAG run lists (#52989)
Fix db downgrade check condition (#53005)
Fix log viewing for skipped task (#53028,#53101)
Fixes Grid view refresh after user actions (#53086)
Fix no_status and duration for grid summaries (#53092)
Fix ti.log_url not in Task Context (#50376)
Fix XCom data deserialization when using XCom.get_all() method (#53102)

Miscellaneous

Update connections_test CLI to use Connection instead of BaseHook (#51834) (#51917)
Fix table pagination when DAG filtering changes (#51795)
UI: Move asset events to its own tab (#51655)
Exclude libcst 1.8.1 for Python 3.9 (#51609)
UI: Implement navigation on bar click (#50416)
Reduce unnecessary logging when retrieving connections and variables (#51826)

Doc Only Changes

Add note about payload size considerations in API docs (#51768)
Enhance ENV vars and conns visibility docs (#52026)
Add http-only warning when running behind proxy in documentation (#52699)
Publish separate docs for Task SDK (#52682)
Streamline Taskflow examples and link to core tutorial (#52709)
Refresh Public Interface & align how-to guides for Airflow 3.0+ (#53011)

Full Changelog: https://github.com/apache/airflow/compare/3.0.2...3.0.3