Apache Airflow 2.4.0

## New Features - Add Data-aware Scheduling (https://github.com/apache/airflow/pulls?q=is%3Apr+is%3Amerged+label%3AAIP-48+milestone%3A%22Airflow+2.4.0%22) - Add ``@task.short_circuit`` TaskFlow decorator (#25752) - Make ``execution_date_or_run_id`` optional in ``tasks test`` command (#26114) - Automatically register DAGs that are used in a context manager (#23592, #26398) - Add option of sending DAG parser logs to stdout. (#25754) - Support multiple ``DagProcessors`` parsing files from different locations. (#25935) - Implement ``ExternalPythonOperator`` (#25780) - Make execution_date optional for command ``dags test`` (#26111) - Implement ``expand_kwargs()`` against a literal list (#25925) - Add trigger rule tooltip (#26043) - Add conf parameter to CLI for airflow dags test (#25900) - Include scheduled slots in pools view (#26006) - Add ``output`` property to ``MappedOperator`` (#25604) - Add roles delete command to cli (#25854) - Add Airflow specific warning classes (#25799) - Add support for ``TaskGroup`` in ``ExternalTaskSensor`` (#24902) - Add ``@task.kubernetes`` taskflow decorator (#25663) - Add a way to import Airflow without side-effects (#25832) - Let timetables control generated run_ids. (#25795) - Allow per-timetable ordering override in grid view (#25633) - Grid logs for mapped instances (#25610, #25621, #25611) - Consolidate to one ``schedule`` param (#25410) - DAG regex flag in backfill command (#23870) - Adding support for owner links in the Dags view UI (#25280) - Ability to clear a specific DAG Run's task instances via REST API (#23516) - Possibility to document DAG with a separate markdown file (#25509) - Add parsing context to DAG Parsing (#25161) - Implement ``CronTriggerTimetable`` (#23662) - Add option to mask sensitive data in UI configuration page (#25346) - Create new databases from the ORM (#24156) - Implement ``XComArg.zip(*xcom_args)`` (#25176) - Introduce ``sla_miss`` metric (#23402) - Implement ``map()`` semantic (#25085) - Add override method to TaskGroupDecorator (#25160) - Implement ``expand_kwargs()`` (#24989) - Add parameter to turn off SQL query logging (#24570) - Add ``DagWarning`` model, and a check for missing pools (#23317) - Add Task Logs to Grid details panel (#24249) - Added small health check server and endpoint in scheduler(#23905) - Add built-in External Link for ``ExternalTaskMarker`` operator (#23964) - Add default task retry delay config (#23861) - Add clear DagRun endpoint. (#23451) - Add support for timezone as string in cron interval timetable (#23279) - Add auto-refresh to dags home page (#22900, #24770) ## Improvements - Add more weekday operator and sensor examples #26071 (#26098) - Add subdir parameter to dags reserialize command (#26170) - Update zombie message to be more descriptive (#26141) - Only send an ``SlaCallbackRequest`` if the DAG is scheduled (#26089) - Promote ``Operator.output`` more (#25617) - Upgrade API files to typescript (#25098) - Less ``hacky`` double-rendering prevention in mapped task (#25924) - Improve Audit log (#25856) - Remove mapped operator validation code (#25870) - More ``DAG(schedule=...)`` improvements (#25648) - Reduce ``operator_name`` dupe in serialized JSON (#25819) - Make grid view group/mapped summary UI more consistent (#25723) - Remove useless statement in ``task_group_to_grid`` (#25654) - Add optional data interval to ``CronTriggerTimetable`` (#25503) - Remove unused code in ``/grid`` endpoint (#25481) - Add and document description fields (#25370) - Improve Airflow logging for operator Jinja template processing (#25452) - Update core example DAGs to use ``@task.branch`` decorator (#25242) - Update DAG ``audit_log`` route (#25415) - Change stdout and stderr access mode to append in commands (#25253) - Remove ``getTasks`` from Grid view (#25359) - Improve taskflow type hints with ParamSpec (#25173) - Use tables in grid details panes (#25258) - Explicitly list ``@dag`` arguments (#25044) - More typing in ``SchedulerJob`` and ``TaskInstance`` (#24912) - Patch ``getfqdn`` with more resilient version (#24981) - Replace all ``NBSP`` characters by ``whitespaces`` (#24797) - Re-serialize all DAGs on ``airflow db upgrade`` (#24518) - Rework contract of try_adopt_task_instances method (#23188) - Make ``expand()`` error vague so it's not misleading (#24018) - Add enum validation for ``[webserver]analytics_tool`` (#24032) - Add ``dttm`` searchable field in audit log (#23794) - Allow more parameters to be piped through via ``execute_in_subprocess`` (#23286) - Use ``func.count`` to count rows (#23657) - Remove stale serialized dags (#22917) - AIP45 Remove dag parsing in airflow run local (#21877) - Add support for queued state in DagRun update endpoint. (#23481) - Add fields to dagrun endpoint (#23440) - Use ``sql_alchemy_conn`` for celery result backend when ``result_backend`` is not set (#24496) ## Bug Fixes - Have consistent types between the ORM and the migration files (#24044, #25869) - Disallow any dag tags longer than 100 char (#25196) - Add the dag_id to ``AirflowDagCycleException`` message (#26204) - Properly build URL to retrieve logs independently from system (#26337) - For worker log servers only bind to IPV6 when dual stack is available (#26222) - Fix ``TaskInstance.task`` not defined before ``handle_failure`` (#26040) - Undo secrets backend config caching (#26223) - Fix faulty executor config serialization logic (#26191) - Show ``DAGs`` and ``Datasets`` menu links based on role permission (#26183) - Allow setting ``TaskGroup`` tooltip via function docstring (#26028) - Fix RecursionError on graph view of a DAG with many tasks (#26175) - Fix backfill occasional deadlocking (#26161) - Fix ``DagRun.start_date`` not set during backfill with ``--reset-dagruns`` True (#26135) - Use label instead of id for dynamic task labels in graph (#26108) - Don't fail DagRun when leaf ``mapped_task`` is SKIPPED (#25995) - Add group prefix to decorated mapped task (#26081) - Fix UI flash when triggering with dup logical date (#26094) - Fix Make items nullable for ``TaskInstance`` related endpoints to avoid API errors (#26076) - Fix ``BranchDateTimeOperator`` to be ``timezone-awreness-insensitive`` (#25944) - Fix legacy timetable schedule interval params (#25999) - Fix response schema for ``list-mapped-task-instance`` (#25965) - Properly check the existence of missing mapped TIs (#25788) - Fix broken auto-refresh on grid view (#25950) - Use per-timetable ordering in grid UI (#25880) - Rewrite recursion when parsing DAG into iteration (#25898) - Find cross-group tasks in ``iter_mapped_dependants`` (#25793) - Fail task if mapping upstream fails (#25757) - Support ``/`` in variable get endpoint (#25774) - Use cfg default_wrap value for grid logs (#25731) - Add origin request args when triggering a run (#25729) - Operator name separate from class (#22834) - Fix incorrect data interval alignment due to assumption on input time alignment (#22658) - Return None if an ``XComArg`` fails to resolve (#25661) - Correct ``json`` arg help in ``airflow variables set`` command (#25726) - Added MySQL index hint to use ``ti_state`` on ``find_zombies`` query (#25725) - Only excluded actually expanded fields from render (#25599) - Grid, fix toast for ``axios`` errors (#25703) - Fix UI redirect (#26409) - Require dag_id arg for dags list-runs (#26357) - Check for queued states for dags auto-refresh (#25695) - Fix upgrade code for the ``dag_owner_attributes`` table (#25579) - Add map index to task logs api (#25568) - Ensure that zombie tasks for dags with errors get cleaned up (#25550) - Make extra link work in UI (#25500) - Sync up plugin API schema and definition (#25524) - First/last names can be empty (#25476) - Refactor DAG pages to be consistent (#25402) - Check ``expand_kwargs()`` input type before unmapping (#25355) - Filter XCOM by key when calculating map lengths (#24530) - Fix ``ExternalTaskSensor`` not working with dynamic task (#25215) - Added exception catching to send default email if template file raises any exception (#24943) - Bring ``MappedOperator`` members in sync with ``BaseOperator`` (#24034) ## Misc/Internal - Add automatically generated ``ERD`` schema for the ``MetaData`` DB (#26217) - Mark serialization functions as internal (#26193) - Remove remaining deprecated classes and replace them with ``PEP562`` (#26167) - Move ``dag_edges`` and ``task_group_to_dict`` to corresponding util modules (#26212) - Lazily import many modules to improve import speed (#24486, #26239) - FIX Incorrect typing information (#26077) - Add missing contrib classes to deprecated dictionaries (#26179) - Re-configure/connect the ``ORM`` after forking to run a DAG processor (#26216) - Remove cattrs from lineage processing. (#26134) - Removed deprecated contrib files and replace them with ``PEP-562`` getattr (#26153) - Make ``BaseSerialization.serialize`` "public" to other classes. (#26142) - Change the template to use human readable task_instance description (#25960) - Bump ``moment-timezone`` from ``0.5.34`` to ``0.5.35`` in ``/airflow/www`` (#26080) - Fix Flask deprecation warning (#25753) - Add ``CamelCase`` to generated operations types (#25887) - Fix migration issues and tighten the CI upgrade/downgrade test (#25869) - Fix type annotations in ``SkipMixin`` (#25864) - Workaround setuptools editable packages path issue (#25848) - Bump ``undici`` from ``5.8.0 to 5.9.1`` in /airflow/www (#25801) - Add custom_operator_name attr to ``_BranchPythonDecoratedOperator`` (#25783) - Clarify ``filename_template`` deprecation message (#25749) - Use ``ParamSpec`` to replace ``...`` in Callable (#25658) - Remove deprecated modules (#25543) - Documentation on task mapping additions (#24489) - Remove Smart Sensors (#25507) - Fix ``elasticsearch`` test config to avoid warning on deprecated template (#25520) - Bump ``terser`` from ``4.8.0 to 4.8.1`` in /airflow/ui (#25178) - Generate ``typescript`` types from rest ``API`` docs (#25123) - Upgrade utils files to ``typescript`` (#25089) - Upgrade remaining context file to ``typescript``. (#25096) - Migrate files to ``ts`` (#25267) - Upgrade grid Table component to ``ts.`` (#25074) - Skip mapping against mapped ``ti`` if it returns None (#25047) - Refactor ``js`` file structure (#25003) - Move mapped kwargs introspection to separate type (#24971) - Only assert stuff for mypy when type checking (#24937) - Bump ``moment`` from ``2.29.3 to 2.29.4`` in ``/airflow/www`` (#24885) - Remove "bad characters" from our codebase (#24841) - Remove ``xcom_push`` flag from ``BashOperator`` (#24824) - Move Flask hook registration to end of file (#24776) - Upgrade more javascript files to ``typescript`` (#24715) - Clean up task decorator type hints and docstrings (#24667) - Preserve original order of providers' connection extra fields in UI (#24425) - Rename ``charts.css`` to ``chart.css`` (#24531) - Rename ``grid.css`` to ``chart.css`` (#24529) - Misc: create new process group by ``set_new_process_group`` utility (#24371) - Airflow UI fix Prototype Pollution (#24201) - Bump ``moto`` version (#24222) - Remove unused ``[github_enterprise]`` from ref docs (#24033) - Clean up ``f-strings`` in logging calls (#23597) - Add limit for ``JPype1`` (#23847) - Simply json responses (#25518) - Add min attrs version (#26408) ## Doc only changes - Add url prefix setting for ``Celery`` Flower (#25986) - Updating deprecated configuration in examples (#26037) - Fix wrong link for taskflow tutorial (#26007) - Reorganize tutorials into a section (#25890) - Fix concept doc for dynamic task map (#26002) - Update code examples from "classic" operators to taskflow (#25845, #25657) - Add instructions on manually fixing ``MySQL`` Charset problems (#25938) - Prefer the local Quick Start in docs (#25888) - Fix broken link to ``Trigger Rules`` (#25840) - Improve docker documentation (#25735) - Correctly link to Dag parsing context in docs (#25722) - Add note on ``task_instance_mutation_hook`` usage (#25607) - Note that TaskFlow API automatically passes data between tasks (#25577) - Update DAG run to clarify when a DAG actually runs (#25290) - Update tutorial docs to include a definition of operators (#25012) - Rewrite the Airflow documentation home page (#24795) - Fix ``task-generated mapping`` example (#23424) - Add note on subtle logical date change in ``2.2.0`` (#24413) - Add missing import in best-practices code example (#25391)