Add dynamic task mapping (https://github.com/apache/airflow/pulls?q=is%3Apr+is%3Amerged+label%3AAIP-42+milestone%3A%22Airflow+2.3.0%22)
New Grid View replaces Tree View (#18675)
Templated requirements.txt in Python Operators (#17349)
Allow reuse of decorated tasks (#22941)
Move the database configuration to a new section (#22284)
Add SmoothOperator (#22813)
Make operator's execution_timeout configurable (#22389)
Events Timetable (#22332)
Support dag serialization with custom ti_deps rules (#22698)
Support log download in task log view (#22804)
support for continue backfill on failures (#22697)
Add dag-processor cli command (#22305)
Add possibility to create users in LDAP mode (#22619)
Add ignore_first_depends_on_past for scheduled jobs (#22491)
Update base sensor operator to support XCOM return value (#20656)
Add an option for run id in the ui trigger screen (#21851)
Enable JSON serialization for connections (#19857)
Add REST API endpoint for bulk update of DAGs (#19758)
Add queue button to click-on-DagRun interface. (#21555)
Add list-import-errors to airflow dags command (#22084)
Store callbacks in database if standalone_dag_processor config is True. (#21731)
Add LocalKubernetesExecutor (#19729)
Add celery.task_timeout_error metric (#21602)
Airflow db downgrade cli command (#21596)
Add ALL_SKIPPED trigger rule (#21662)
Add db clean CLI command for purging old data (#20838)
Add celery_logging_level (#21506)
Support different timeout value for dag file parsing (#21501)
Support generating SQL script for upgrades (#20962)
Add option to compress Serialized dag data (#21332)
Branch python operator decorator (#20860)
Add Audit Log View to Dag View (#20733)
Add missing StatsD metric for failing SLA Callback notification (#20924)
Add ShortCircuitOperator configurability for respecting downstream trigger rules (#20044)
Allow using Markup in page title in Webserver (#20888)
Add Listener Plugin API that tracks TaskInstance state changes (#20443)
Add context var hook to inject more env vars (#20361)
Add a button to set all tasks to skipped (#20455)
Cleanup pending pods (#20438)
Add config to warn public deployment exposure in UI (#18557)
Log filename template records (#20165)
Added windows extensions (#16110)
Showing approximate time until next dag_run in Airflow (#20273)
Extend config window on UI (#20052)
Add show dag dependencies feature to CLI (#19985)
Add cli command for 'airflow dags reserialize` (#19471)
Add missing description field to Pool schema(REST API) (#19841)
Introduce DagRun action to change state to queued. (#19353)
Add DAG run details page (#19705)
Add role export/import to cli tools (#18916)
Adding dag_id_pattern parameter to the /dags endpoint (#18924)

Improvements

Show schedule_interval/timetable description in UI (#16931)
Added column duration to DAG runs view (#19482)
Enable use of custom conn extra fields without prefix (#22607)
Initialize finished counter at zero (#23080)
Improve logging of optional provider features messages (#23037)
Meaningful error message in resolve_template_files (#23027)
Update ImportError items instead of deleting and recreating them (#22928)
Add option --skip-init to db reset command (#22989)
Support importing connections from files with ".yml" extension (#22872)
Support glob syntax in .airflowignore files (#21392) (#22051)
Hide pagination when data is a single page (#22963)
Support for sorting DAGs in the web UI (#22671)
Speed up has_access decorator by ~200ms (#22858)
Add XComArg to lazy-imported list of Airflow module (#22862)
Add more fields to REST API dags/dag_id/details endpoint (#22756)
Don't show irrelevant/duplicated/"internal" Task attrs in UI (#22812)
No need to load whole ti in current_state (#22764)
Pickle dag exception string fix (#22760)
Better verification of Localexecutor's parallelism option (#22711)
log backfill exceptions to sentry (#22704)
retry commit on MySQL deadlocks during backfill (#22696)
Add more fields to REST API get DAG(dags/dag_id) endpoint (#22637)
Use timetable to generate planned days for current year (#22055)
Disable connection pool for celery worker (#22493)
Make date picker label visible in trigger dag view (#22379)
Expose try_number in airflow vars (#22297)
Add generic connection type (#22310)
Add a few more fields to the taskinstance finished log message (#22262)
Pause auto-refresh if scheduler isn't running (#22151)
Show DagModel details. (#21868)
Add pip_install_options to PythonVirtualenvOperator (#22158)
Show import error for airflow dags list CLI command (#21991)
Pause auto-refresh when page is hidden (#21904)
Default args type check (#21809)
Enhance magic methods on XComArg for UX (#21882)
py files don't have to be checked is_zipfiles in refresh_dag (#21926)
Fix TaskDecorator type hints (#21881)
Add 'Show record' option for variables (#21342)
Use DB where possible for quicker airflow dag subcommands (#21793)
REST API: add rendered fields in task instance. (#21741)
Change the default auth backend to session (#21640)
Don't check if py DAG files are zipped during parsing (#21538)
Switch XCom implementation to use run_id (#20975)
Action log on Browse Views (#21569)
Implement multiple API auth backends (#21472)
Change logging level details of connection info in get_connection() (#21162)
Support mssql in airflow db shell (#21511)
Support config worker_enable_remote_control for celery (#21507)
Log memory usage in CgroupTaskRunner (#21481)
Modernize DAG-related URL routes and rename "tree" to "grid" (#20730)
Move Zombie detection to SchedulerJob (#21181)
Improve speed to run airflow by 6x (#21438)
Add more SQL template fields renderers (#21237)
Simplify fab has access lookup (#19294)
Log context only for default method (#21244)
Log trigger status only if at least one is running (#21191)
Add optional features in providers. (#21074)
Better multiple_outputs inferral for @task.python (#20800)
Improve handling of string type and non-attribute template_fields (#21054)
Remove un-needed deps/version requirements (#20979)
Correctly specify overloads for TaskFlow API for type-hinting (#20933)
Introduce notification_sent to SlaMiss view (#20923)
Rewrite the task decorator as a composition (#20868)
Add "Greater/Smaller than or Equal" to filters in the browse views (#20602) (#20798)
Rewrite DAG run retrieval in task command (#20737)
Speed up creation of DagRun for large DAGs (5k+ tasks) by 25-130% (#20722)
Make native environment Airflow-flavored like sandbox (#20704)
Better error when param value has unexpected type (#20648)
Add filter by state in DagRun REST API (List Dag Runs) (#20485)
Prevent exponential memory growth in Tasks with custom logging handler (#20541)
Set default logger in logging Mixin (#20355)
Reduce deprecation warnings from www (#20378)
Add hour and minute to time format on x-axis of all charts using nvd3.lineChart (#20002)
Add specific warning when Task asks for more slots than pool defined with (#20178)
UI: Update duration column for better human readability (#20112)
Use Viewer role as example public role (#19215)
Properly implement DAG param dict copying (#20216)
ShortCircuitOperator push XCom by returning python_callable result (#20071)
Add clear logging to tasks killed due to a Dagrun timeout (#19950)
Change log level for Zombie detection messages (#20204)
Better confirmation prompts (#20183)
Only execute TIs of running DagRuns (#20182)
Check and run migration in commands if necessary (#18439)
Log only when Zombies exists (#20118)
Increase length of the email and username (#19932)
Add more filtering options for TI's in the UI (#19910)
Dynamically enable "Test Connection" button by connection type (#19792)
Avoid littering postgres server logs with "could not obtain lock" with HA schedulers (#19842)
Renamed Connection.get_hook parameter to make it the same as in SqlSensor and SqlOperator. (#19849)
Add hook_params in SqlSensor using the latest changes from PR #18718. (#18431)
Speed up webserver boot time by delaying provider initialization (#19709)
Configurable logging of XCOM value in PythonOperator (#19378)
Minimize production js files (#19658)
Add hook_params in BaseSqlOperator (#18718)
Add missing "end_date" to hash components (#19281)
More friendly output of the airflow plugins command + add timetables (#19298)
Add sensor default timeout config (#19119)
Update taskinstance REST API schema to include dag_run_id field (#19105)
Adding feature in bash operator to append the user defined env variable to system env variable (#18944)
Duplicate Connection: Added logic to query if a connection id exists before creating one (#18161)

Bug Fixes

Use inherited 'trigger_tasks' method (#23016)
In DAG dependency detector, use class type instead of class name (#21706)
Fix tasks being wrongly skipped by schedule_after_task_execution (#23181)
Fix X-Frame enabled behaviour (#23222)
Allow extra to be nullable in connection payload as per schema(REST API). (#23183)
Fix dag_id extraction for dag level access checks in web ui (#23015)
Fix timezone display for logs on UI (#23075)
Include message in graph errors (#23021)
Change trigger dropdown left position (#23013)
Don't add planned tasks for legacy DAG runs (#23007)
Add dangling rows check for TaskInstance references (#22924)
Validate the input params in connection CLI command (#22688)
Fix trigger event payload is not persisted in db (#22944)
Drop "airflow moved" tables in command db reset (#22990)
Add max width to task group tooltips (#22978)
Add template support for external_task_ids. (#22809)
Allow DagParam to hold falsy values (#22964)
Fix regression in pool metrics (#22939)
Priority order tasks even when using pools (#22483)
Do not clear XCom when resuming from deferral (#22932)
Handle invalid JSON metadata in get_logs_with_metadata endpoint. (#22898)
Fix pre-upgrade check for rows dangling w.r.t. dag_run (#22850)
Fixed backfill interference with scheduler (#22701)
Support conf param override for backfill runs (#22837)
Correctly interpolate pool name in PoolSlotsAvailableDep statues (#22807)
Fix email_on_failure with render_template_as_native_obj (#22770)
Fix processor cleanup on DagFileProcessorManager (#22685)
Prevent meta name clash for task instances (#22783)
remove json parse for gantt chart (#22780)
Check for missing dagrun should know version (#22752)
Fixes ScheduleInterval spec (#22635)
Fixing task status for non-running and non-committed tasks (#22410)
Do not log the hook connection details even at DEBUG level (#22627)
Stop crashing when empty logs are received from kubernetes client (#22566)
Fix bugs about timezone change (#22525)
Fix entire DAG stops when one task has end_date (#20920)
Use logger to print message during task execution. (#22488)
Make sure finalizers are not skipped during exception handling (#22475)
update smart sensor docs and minor fix on is_smart_sensor_compatible() (#22386)
Fix run_id k8s and elasticsearch compatibility with Airflow 2.1 (#22385)
Allow to except_skip None on BranchPythonOperator (#20411)
Fix incorrect datetime details (DagRun views) (#21357)
Remove incorrect deprecation warning in secrets backend (#22326)
Remove RefreshConfiguration workaround for K8s token refreshing (#20759)
Masking extras in GET /connections/<connection> endpoint (#22227)
Set queued_dttm when submitting task to directly to executor (#22259)
Addressed some issues in the tutorial mentioned in discussion #22233 (#22236)
Change default python executable to python3 for docker decorator (#21973)
Don't validate that Params are JSON when NOTSET (#22000)
Add per-DAG delete permissions (#21938)
Fix handling some None parameters in kubernetes 23 libs. (#21905)
Fix handling of empty (None) tags in bulk_write_to_db (#21757)
Fix DAG date range bug (#20507)
Removed request.referrer from views.py (#21751)
Make DbApiHook use get_uri from Connection (#21764)
Fix some migrations (#21670)
[de]serialize resources on task correctly (#21445)
Add params dag_id, task_id etc to XCom.serialize_value (#19505)
Update test connection functionality to use custom form fields (#21330)
fix all "high" npm vulnerabilities (#21526)
Fix bug incorrectly removing action from role, rather than permission. (#21483)
Fix relationship join bug in FAB/SecurityManager with SQLA 1.4 (#21296)
Use Identity instead of Sequence in SQLAlchemy 1.4 for MSSQL (#21238)
Ensure on_task_instance_running listener can get at task (#21157)
Return to the same place when triggering a DAG (#20955)
Fix task ID deduplication in @task_group (#20870)
Add downgrade to some FAB migrations (#20874)
Only validate Params when DAG is triggered (#20802)
Fix airflow trigger cli (#20781)
Fix task instances iteration in a pool to prevent blocking (#20816)
Allow depending to a @task_group as a whole (#20671)
Use original task's start_date if a task continues after deferral (#20062)
Disabled edit button in task instances list view page (#20659)
Fix a package name import error (#20519) (#20519)
Remove execution_date label when get cleanup pods list (#20417)
Remove unneeded FAB REST API endpoints (#20487)
Fix parsing of Cloudwatch log group arn containing slashes (#14667) (#19700)
Sanity check for MySQL's TIMESTAMP column (#19821)
Allow using default celery command group with executors subclassed from Celery-based executors. (#18189)
Move class_permission_name to mixin so it applies to all classes (#18749)
Adjust trimmed_pod_id and replace '.' with '-' (#19036)
Pass custom_headers to send_email and send_email_smtp (#19009)
Ensure catchup=False is used in example dags (#19396)
Edit permalinks in OpenApi description file (#19244)
Navigate directly to DAG when selecting from search typeahead list (#18991)
[Minor] Fix padding on home page (#19025)

Doc only changes

Update doc for DAG file processing (#23209)
Replace changelog/updating with release notes and towncrier now (#22003)
Fix wrong reference in tracking-user-activity.rst (#22745)
Remove references to rbac = True from docs (#22725)
Doc: Update description for executor-bound dependencies (#22601)
Update check-health.rst (#22372)
Stronger language about Docker Compose customizability (#22304)
Update logging-tasks.rst (#22116)
Add example config of sql_alchemy_connect_args (#22045)
Update best-practices.rst (#22053)
Add information on DAG pausing/deactivation/deletion (#22025)
Add brief examples of integration test dags you might want (#22009)
Run inclusive language check on CHANGELOG (#21980)
Add detailed email docs for Sendgrid (#21958)
Add docs for db upgrade / db downgrade (#21879)
Update modules_management.rst (#21889)
Fix UPDATING section on SqlAlchemy 1.4 scheme changes (#21887)
Update TaskFlow tutorial doc to show how to pass "operator-level" args. (#21446)
Fix doc - replace decreasing by increasing (#21805)
Add another way to dynamically generate DAGs to docs (#21297)
Add extra information about time synchronization needed (#21685)
Update debug.rst docs (#21246)
Replaces the usage of postgres:// with postgresql:// (#21205)
Fix task execution process in CeleryExecutor docs (#20783)

Misc/Internal

Bring back deprecated security manager functions (#23243)
Replace usage of DummyOperator with EmptyOperator (#22974)
Deprecate DummyOperator in favor of EmptyOperator (#22832)
Remove unnecessary python 3.6 conditionals (#20549)
Bump moment from 2.29.1 to 2.29.2 in /airflow/www (#22873)
Bump prismjs from 1.26.0 to 1.27.0 in /airflow/www (#22823)
Bump nanoid from 3.1.23 to 3.3.2 in /airflow/www (#22803)
Bump minimist from 1.2.5 to 1.2.6 in /airflow/www (#22798)
Remove dag parsing from db init command (#22531)
Update our approach for executor-bound dependencies (#22573)
Use Airflow.Base.metadata in FAB models (#22353)
Limit docutils to make our documentation pretty again (#22420)
Add Python 3.10 support (#22050)
[FEATURE] add 1.22 1.23 K8S support (#21902)
Remove pandas upper limit now that SQLA is 1.4+ (#22162)
Patch sql_alchemy_conn if old postgres scheme used (#22333)
Protect against accidental misuse of XCom.get_value() (#22244)
Order filenames for migrations (#22168)
Don't try to auto generate migrations for Celery tables (#22120)
Require SQLAlchemy 1.4 (#22114)
bump sphinx-jinja (#22101)
Add compat shim for SQLAlchemy to avoid warnings (#21959)
Rename xcom.dagrun_id to xcom.dag_run_id (#21806)
Deprecate non-JSON conn.extra (#21816)
Bump upper bound version of jsonschema to 5.0 (#21712)
Deprecate helper utility days_ago (#21653)
Remove :type lines now sphinx-autoapi supports type hints (#20951)
Silence deprecation warning in tests (#20900)
Use DagRun.run_id instead of execution_date when updating state of TIs (UI & REST API) (#18724)
Add Context stub to Airflow packages (#20817)
Update Kubernetes library version (#18797)
Rename PodLauncher to PodManager (#20576)
Removes Python 3.6 support (#20467)
Add deprecation warning for non-json-serializable params (#20174)
Rename TaskMixin to DependencyMixin (#20297)
Deprecate passing execution_date to XCom methods (#19825)
Remove get_readable_dags and get_editable_dags, and get_accessible_dags. (#19961)
Remove postgres 9.6 support (#19987)
Removed hardcoded connection types. Check if hook is instance of DbApiHook. (#19639)
add kubernetes 1.21 support (#19557)
Add FAB base class and set import_name explicitly. (#19667)
Removes unused state transitions to handle auto-changing view permissions. (#19153)
Chore: Use enum for __var and __type members (#19303)
Use fab models (#19121)
Consolidate method names between Airflow Security Manager and FAB default (#18726)
Remove distutils usages for Python 3.10 (#19064)
Removing redundant max_tis_per_query initialisation on SchedulerJob (#19020)
Remove deprecated usage of init_role() from API (#18820)
Remove duplicate code on dbapi hook (#18821)