Significant Changes

• Raw HTML code in DAG docs and DAG params descriptions is disabled by default

  To ensure that no malicious javascript can be injected with DAG descriptions or trigger UI forms by DAG authors a new parameter webserver.allow_raw_html_descriptions was added with default value of False. If you trust your DAG authors code and want to allow using raw HTML in DAG descriptions and params, you can restore the previous behavior by setting the configuration value to True.

  To ensure Airflow is secure by default, the raw HTML support in trigger UI has been super-seeded by markdown support via the description_md attribute. If you have been using description_html please migrate to description_md. The custom_html_form is now deprecated. (#35460)

New Features

• AIP-58: Add Airflow ObjectStore (AFS) (AIP-58)
• Add XCom tab to Grid (#35719)
• Add "literal" wrapper to disable field templating (#35017)
• Add task context logging feature to allow forwarding messages to task logs (#32646, #32693, #35857)
• Add Listener hooks for Datasets (#34418, #36247)
• Allow override of navbar text color (#35505)
• Add lightweight serialization for deltalake tables (#35462)
• Add support for serialization of iceberg tables (#35456)
• prev_end_date_success method access (#34528)
• Add task parameter to set custom logger name (#34964)
• Add pyspark decorator (#35247)
• Add trigger as a valid option for the db clean command (#34908)
• Add decorators for external and venv python branching operators (#35043)
• Allow PythonVenvOperator using other index url (#33017)
• Add Python Virtualenv Operator Caching (#33355)
• Introduce a generic export for containerized executor logging (#34903)
• Add ability to clear downstream tis in List Task Instances view (#34529)
• Attribute clear_number to track DAG run being cleared (#34126)
• Add BranchPythonVirtualenvOperator (#33356)
• Allow PythonVenvOperator using other index url (#33017)
• Add CLI notification commands to providers (#33116)
• Use dropdown instead of buttons when there are more than 10 retries in log tab (#36025)

Improvements

• Add multiselect to run state in grid view (#35403)
• Fix warning message in Connection.get_hook in case of ImportError (#36005)
• Add processor_subdir to import_error table to handle multiple dag processors (#35956)
• Consolidate the call of change_state to fail or success in the core executors (#35901)
• Relax mandatory requirement for start_date when schedule=None (#35356)
• Use ExitStack to manage mutation of secrets_backend_list in dag.test (#34620)
• improved visibility of tasks in ActionModal for taskinstance (#35810)
• Create directories based on AIRFLOW_CONFIG path (#35818)
• Implements JSON-string connection representation generator (#35723)
• Move BaseOperatorLink into the separate module (#35032)
• Set mark_end_on_close after set_context (#35761)
• Move external logs links to top of react logs page (#35668)
• Change terminal mode to cbreak in execute_interactive and handle SIGINT (#35602)
• Make raw HTML descriptions configurable (#35460)
• Allow email field to be templated (#35546)
• Hide logical date and run id in trigger UI form (#35284)
• Improved instructions for adding dependencies in TaskFlow (#35406)
• Add optional exit code to list import errors (#35378)
• Limit query result on DB rather than client in synchronize_log_template function (#35366)
• Allow description to be passed in when using variables CLI (#34791)
• Allow optional defaults in required fields with manual triggered dags (#31301)
• Permitting airflow kerberos to run in different modes (#35146)
• Refactor commands to unify daemon context handling (#34945)
• Add extra fields to plugins endpoint (#34913)
• Add description to pools view (#34862)
• Move cli's Connection export and Variable export command print logic to a separate function (#34647)
• Extract and reuse get_kerberos_principle func from get_kerberos_principle (#34936)
• Change type annotation for BaseOperatorLink.operators (#35003)
• Optimise and migrate to SA2-compatible syntax for TaskReschedule (#33720)
• Consolidate the permissions name in SlaMissModelView (#34949)
• Add debug log saying what's being run to EventScheduler (#34808)
• Increase log reader stream loop sleep duration to 1 second (#34789)
• Resolve pydantic deprecation warnings re update_forward_refs (#34657)
• Unify mapped task group lookup logic (#34637)
• Allow filtering event logs by attributes (#34417)
• Make connection login and password TEXT (#32815)
• Ban import Dataset from airflow package in codebase (#34610)
• Use airflow.datasets.Dataset in examples and tests (#34605)
• Enhance task status visibility (#34486)
• Simplify DAG trigger UI (#34567)
• Ban import AirflowException from airflow (#34512)
• Add descriptions for airflow resource config parameters (#34438)
• Simplify trigger name expression (#34356)
• Move definition of Pod*Exceptions to pod_generator (#34346)
• Add deferred tasks to the cluster_activity view Pools Slots (#34275)
• heartbeat failure log message fix (#34160)
• Rename variables for dag runs (#34049)
• Clarify new_state in OpenAPI spec (#34056)
• Remove version top-level element from docker compose files (#33831)
• Remove generic trigger cancelled error log (#33874)
• Use NOT EXISTS subquery instead of tuple_not_in_condition (#33527)
• Allow context key args to not provide a default (#33430)
• Order triggers by - TI priority_weight when assign unassigned triggers (#32318)
• Add metric triggerer_heartbeat (#33320)
• Allow airflow variables export to print to stdout (#33279)
• Workaround failing deadlock when running backfill (#32991)
• add dag_run_ids and task_ids filter for the batch task instance API endpoint (#32705)
• Configurable health check threshold for triggerer (#33089)
• Rework provider manager to treat Airflow core hooks like other provider hooks (#33051)
• Ensure DAG-level references are filled on unmap (#33083)
• Affix webserver access_denied warning to be configurable (#33022)
• Add support for arrays of different data types in the Trigger Form UI (#32734)
• Add a mechanism to warn if executors override existing CLI commands (#33423)

Bug Fixes

• Account for change in UTC offset when calculating next schedule (#35887)
• Add read access to pools for viewer role (#35352)
• Fix gantt chart queued duration when queued_dttm is greater than start_date for deferred tasks (#35984)
• Avoid crushing container when directory is not found on rm (#36050)
• Update reset_user_sessions to work from either CLI or web (#36056)
• Fix UI Grid error when DAG has been removed. (#36028)
• Change Trigger UI to use HTTP POST in web ui (#36026)
• Fix airflow db shell needing an extra key press to exit (#35982)
• Change dag grid overscroll behaviour to auto (#35717)
• Run triggers inline with dag test (#34642)
• Add borderWidthRight to grid for Firefox scrollbar (#35346)
• Fix for infinite recursion due to secrets_masker (#35048)
• Fix write processor_subdir in serialized_dag table (#35661)
• Reload configuration for standalone dag file processor (#35725)
• Long custom operator name overflows in graph view (#35382)
• Add try_number to extra links query (#35317)
• Prevent assignment of non JSON serializable values to DagRun.conf dict (#35096)
• Numeric values in DAG details are incorrectly rendered as timestamps (#35538)
• Fix Scheduler and triggerer crashes in daemon mode when statsd metrics are enabled (#35181)
• Infinite UI redirection loop after deactivating an active user (#35486)
• Bug fix fetch_callback of Partial Subset DAG (#35256)
• Fix DagRun data interval for DeltaDataIntervalTimetable (#35391)
• Fix query in get_dag_by_pickle util function (#35339)
• Fix TriggerDagRunOperator failing to trigger subsequent runs when reset_dag_run=True (#35429)
• Fix weight_rule property type in mappedoperator (#35257)
• Bugfix/prevent concurrency with cached venv (#35258)
• Fix dag serialization (#34042)
• Fix py/url-redirection by replacing request.referrer by get_redirect() (#34237)
• Fix updating variables during variable imports (#33932)
• Use Literal from airflow.typing_compat in Airflow core (#33821)
• Always use Literal from typing_extensions (#33794)

Miscellaneous

• Change default MySQL client to MariaDB (#36243)
• Mark daskexecutor provider as removed (#35965)
• Bump FAB to 4.3.10 (#35991)
• Mark daskexecutor provider as removed (#35965)
• Rename Connection.to_json_dict to Connection.to_dict (#35894)
• Upgrade to Pydantic v2 (#35551)
• Bump moto version to >= 4.2.9 (#35687)
• Use pyarrow-hotfix to mitigate CVE-2023-47248 (#35650)
• Bump axios from 0.26.0 to 1.6.0 in /airflow/www/ (#35624)
• Make docker decorator's type annotation consistent with operator (#35568)
• Add default to navbar_text_color and rm condition in style (#35553)
• Avoid initiating session twice in dag_next_execution (#35539)
• Work around typing issue in examples and providers (#35494)
• Enable TCH004 and TCH005 rules (#35475)
• Humanize log output about retrieved DAG(s) (#35338)
• Switch from Black to Ruff formatter (#35287)
• Upgrade to Flask Application Builder 4.3.9 (#35085)
• D401 Support (#34932, #34933)
• Use requires_access to check read permission on dag instead of checking it explicitly (#34940)
• Deprecate lazy import AirflowException from airflow (#34541)
• View util refactoring on mapped stuff use cases (#34638)
• Bump postcss from 8.4.25 to 8.4.31 in /airflow/www (#34770)
• Refactor Sqlalchemy queries to 2.0 style (#34763, #34665, #32883, #35120)
• Change to lazy loading of io in pandas serializer (#34684)
• Use airflow.models.dag.DAG in examples (#34617)
• Use airflow.exceptions.AirflowException in core (#34510)
• Check that dag_ids passed in request are consistent (#34366)
• Refactors to make code better (#34278, #34113, #34110, #33838, #34260, #34409, #34377, #34350)
• Suspend qubole provider (#33889)
• Generate Python API docs for Google ADS (#33814)
• Improve importing in modules (#33812, #33811, #33810, #33806, #33807, #33805, #33804, #33803, #33801, #33799, #33800, #33797, #33798, #34406, #33808)
• Upgrade Elasticsearch to 8 (#33135)

Doc Only Changes

• Add support for tabs (and other UX components) to docs (#36041)
• Replace architecture diagram of Airflow with diagrams-generated one (#36035)
• Add the section describing the security model of DAG Author capabilities (#36022)
• Enhance docs for zombie tasks (#35825)
• Reflect drop/add support of DB Backends versions in documentation (#35785)
• More detail on mandatory task arguments (#35740)
• Indicate usage of the re2 regex engine in the .airflowignore documentation. (#35663)
• Update best-practices.rst (#35692)
• Update dag-run.rst to mention Airflow's support for extended cron syntax through croniter (#35342)
• Update webserver.rst to include information of supported OAuth2 providers (#35237)
• Add back dag_run to docs (#35142)
• Fix rst code block format (#34708)
• Add typing to concrete taskflow examples (#33417)
• Add concrete examples for accessing context variables from TaskFlow tasks (#33296)
• Fix links in security docs (#33329)