New Features """"""""""""

• Add PythonVirtualenvDecorator to Taskflow API (#14761)
• Add Taskgroup decorator (#15034)
• Create a DAG Calendar View (#15423)
• Create cross-DAG dependencies view (#13199)
• Add rest API to query for providers (#13394)
• Mask passwords and sensitive info in task logs and UI (#15599)
• Add SubprocessHook for running commands from operators (#13423)
• Add DAG Timeout in UI page "DAG Details" (#14165)
• Add WeekDayBranchOperator (#13997)
• Add JSON linter to DAG Trigger UI (#13551)
• Add DAG Description Doc to Trigger UI Page (#13365)
• Add airflow webserver URL into SLA miss email. (#13249)
• Add read only REST API endpoints for users (#14735)
• Add files to generate Airflow's Python SDK (#14739)
• Add dynamic fields to snowflake connection (#14724)
• Add read only REST API endpoint for roles and permissions (#14664)
• Add new datetime branch operator (#11964)
• Add Google leveldb hook and operator (#13109) (#14105)
• Add plugins endpoint to the REST API (#14280)
• Add worker_pod_pending_timeout support (#15263)
• Add support for labeling DAG edges (#15142)
• Add CUD REST API endpoints for Roles (#14840)
• Import connections from a file (#15177)
• A bunch of template_fields_renderers additions (#15130)
• Add REST API query sort and order to some endpoints (#14895)
• Add timezone context in new ui (#15096)
• Add query mutations to new UI (#15068)
• Add different modes to sort dag files for parsing (#15046)
• Auto refresh on Tree View (#15474)
• BashOperator to raise AirflowSkipException on exit code 99 (by default, configurable) (#13421) (#14963)
• Clear tasks by task ids in REST API (#14500)
• Support jinja2 native Python types (#14603)
• Allow celery workers without gossip or mingle modes (#13880)
• Add airflow jobs check CLI command to check health of jobs (Scheduler etc) (#14519)
• Rename DateTimeBranchOperator to BranchDateTimeOperator (#14720)

Improvements """"""""""""

• Add optional result handler callback to DbApiHook (#15581)
• Update Flask App Builder limit to recently released 3.3 (#15792)
• Prevent creating flask sessions on REST API requests (#15295)
• Sync DAG specific permissions when parsing (#15311)
• Increase maximum length of pool name on Tasks to 256 characters (#15203)
• Enforce READ COMMITTED isolation when using mysql (#15714)
• Auto-apply apply_default to subclasses of BaseOperator (#15667)
• Emit error on duplicated DAG ID (#15302)
• Update KubernetesExecutor pod templates to allow access to IAM permissions (#15669)
• More verbose logs when running airflow db check-migrations (#15662)
• When one_success mark task as failed if no success (#15467)
• Add an option to trigger a dag w/o changing conf (#15591)
• Add Airflow UI instance_name configuration option (#10162)
• Add a decorator to retry functions with DB transactions (#14109)
• Add return to PythonVirtualenvOperator's execute method (#14061)
• Add verify_ssl config for kubernetes (#13516)
• Add description about secret_key when Webserver > 1 (#15546)
• Add Traceback in LogRecord in JSONFormatter (#15414)
• Add support for arbitrary json in conn uri format (#15100)
• Adds description field in variable (#12413) (#15194)
• Add logs to show last modified in SFTP, FTP and Filesystem sensor (#15134)
• Execute on_failure_callback when SIGTERM is received (#15172)
• Allow hiding of all edges when highlighting states (#15281)
• Display explicit error in case UID has no actual username (#15212)
• Serve logs with Scheduler when using Local or Sequential Executor (#15557)
• Deactivate trigger, refresh, and delete controls on dag detail view. (#14144)
• Turn off autocomplete for connection forms (#15073)
• Increase default worker_refresh_interval to 6000 seconds (#14970)
• Only show User's local timezone if it's not UTC (#13904)
• Suppress LOG/WARNING for a few tasks CLI for better CLI experience (#14567)
• Configurable API response (CORS) headers (#13620)
• Allow viewers to see all docs links (#14197)
• Update Tree View date ticks (#14141)
• Make the tooltip to Pause / Unpause a DAG clearer (#13642)
• Warn about precedence of env var when getting variables (#13501)
• Move [celery] default_queue config to [operators] default_queue to re-use between executors (#14699)

Bug Fixes """""""""

• Fix 500 error from updateTaskInstancesState API endpoint when dry_run not passed (#15889)
• Ensure that task preceding a PythonVirtualenvOperator doesn't fail (#15822)
• Prevent mixed case env vars from crashing processes like worker (#14380)
• Fixed type annotations in DAG decorator (#15778)
• Fix on_failure_callback when task receive SIGKILL (#15537)
• Fix dags table overflow (#15660)
• Fix changing the parent dag state on subdag clear (#15562)
• Fix reading from zip package to default to text (#13962)
• Fix wrong parameter for drawDagStatsForDag in dags.html (#13884)
• Fix QueuedLocalWorker crashing with EOFError (#13215)
• Fix typo in NotPreviouslySkippedDep (#13933)
• Fix parallelism after KubeExecutor pod adoption (#15555)
• Fix kube client on mac with keepalive enabled (#15551)
• Fixes wrong limit for dask for python>3.7 (should be <3.7) (#15545)
• Fix Task Adoption in KubernetesExecutor (#14795)
• Fix timeout when using XCom with KubernetesPodOperator (#15388)
• Fix deprecated provider aliases in "extras" not working (#15465)
• Fixed default XCom deserialization. (#14827)
• Fix used_group_ids in dag.partial_subset (#13700) (#15308)
• Further fix trimmed pod_id for KubernetesPodOperator (#15445)
• Bugfix: Invalid name when trimmed pod_id ends with hyphen in KubernetesPodOperator (#15443)
• Fix incorrect slots stats when TI pool_slots > 1 (#15426)
• Fix DAG last run link (#15327)
• Fix sync-perm to work correctly when update_fab_perms = False (#14847)
• Fixes limits on Arrow for plexus test (#14781)
• Fix UI bugs in tree view (#14566)
• Fix AzureDataFactoryHook failing to instantiate its connection (#14565)
• Fix permission error on non-POSIX filesystem (#13121)
• Fix spelling in "ignorable" (#14348)
• Fix get_context_data doctest import (#14288)
• Correct typo in GCSObjectsWtihPrefixExistenceSensor (#14179)
• Fix order of failed deps (#14036)
• Fix critical CeleryKubernetesExecutor bug (#13247)
• Fix four bugs in StackdriverTaskHandler (#13784)
• func.sum may return Decimal that break rest APIs (#15585)
• Persist tags params in pagination (#15411)
• API: Raise AlreadyExists exception when the execution_date is same (#15174)
• Remove duplicate call to sync_metadata inside DagFileProcessorManager (#15121)
• Extra docker-py update to resolve docker op issues (#15731)
• Ensure executors end method is called (#14085)
• Remove user_id from API schema (#15117)
• Prevent clickable bad links on disabled pagination (#15074)
• Acquire lock on db for the time of migration (#10151)
• Skip SLA check only if SLA is None (#14064)
• Print right version in airflow info command (#14560)
• Make airflow info work with pipes (#14528)
• Rework client-side script for connection form. (#14052)
• API: Add CollectionInfo in all Collections that have total_entries (#14366)
• Fix task_instance_mutation_hook when importing airflow.models.dagrun (#15851)

Doc only changes """"""""""""""""

• Fix docstring of SqlSensor (#15466)
• Small changes on "DAGs and Tasks documentation" (#14853)
• Add note on changes to configuration options (#15696)
• Add docs to the markdownlint and yamllint config files (#15682)
• Rename old "Experimental" API to deprecated in the docs. (#15653)
• Fix documentation error in git_sync_template.yaml (#13197)
• Fix doc link permission name (#14972)
• Fix link to Helm chart docs (#14652)
• Fix docstrings for Kubernetes code (#14605)
• docs: Capitalize & minor fixes (#14283) (#14534)
• Fixed reading from zip package to default to text. (#13984)
• An initial rework of the "Concepts" docs (#15444)
• Improve docstrings for various modules (#15047)
• Add documentation on database connection URI (#14124)
• Add Helm Chart logo to docs index (#14762)
• Create a new documentation package for Helm Chart (#14643)
• Add docs about supported logging levels (#14507)
• Update docs about tableau and salesforce provider (#14495)
• Replace deprecated doc links to the correct one (#14429)
• Refactor redundant doc url logic to use utility (#14080)
• docs: NOTICE: Updated 2016-2019 to 2016-now (#14248)
• Skip DAG perm sync during parsing if possible (#15464)
• Add picture and examples for Edge Labels (#15310)
• Add example DAG & how-to guide for sqlite (#13196)
• Add links to new modules for deprecated modules (#15316)
• Add note in Updating.md about FAB data model change (#14478)

Misc/Internal """""""""""""

• Fix logging.exception redundancy (#14823)
• Bump stylelint to remove vulnerable sub-dependency (#15784)
• Add resolution to force dependencies to use patched version of lodash (#15777)
• Update croniter to 1.0.x series (#15769)
• Get rid of Airflow 1.10 in Breeze (#15712)
• Run helm chart tests in parallel (#15706)
• Bump ssri from 6.0.1 to 6.0.2 in /airflow/www (#15437)
• Remove the limit on Gunicorn dependency (#15611)
• Better "dependency already registered" warning message for tasks #14613 (#14860)
• Pin pandas-gbq to <0.15.0 (#15114)
• Use Pip 21.* to install airflow officially (#15513)
• Bump mysqlclient to support the 1.4.x and 2.x series (#14978)
• Finish refactor of DAG resource name helper (#15511)
• Refactor/Cleanup Presentation of Graph Task and Path Highlighting (#15257)
• Standardize default fab perms (#14946)
• Remove datepicker for task instance detail view (#15284)
• Turn provider's import warnings into debug logs (#14903)
• Remove left-over fields from required in provider_info schema. (#14119)
• Deprecate tableau extra (#13595)
• Use built-in cached_property on Python 3.8 where possible (#14606)
• Clean-up JS code in UI templates (#14019)
• Bump elliptic from 6.5.3 to 6.5.4 in /airflow/www (#14668)
• Switch to f-strings using flynt. (#13732)
• use jquery ready instead of vanilla js (#15258)
• Migrate task instance log (ti_log) js (#15309)
• Migrate graph js (#15307)
• Migrate dags.html javascript (#14692)
• Removes unnecessary AzureContainerInstance connection type (#15514)
• Separate Kubernetes pod_launcher from core airflow (#15165)
• update remaining old import paths of operators (#15127)
• Remove broken and undocumented "demo mode" feature (#14601)
• Simplify configuration/legibility of Webpack entries (#14551)
• remove inline tree js (#14552)
• Js linting and inline migration for simple scripts (#14215)
• Remove use of repeated constant in AirflowConfigParser (#14023)
• Deprecate email credentials from environment variables. (#13601)
• Remove unused 'context' variable in task_instance.py (#14049)
• Disable suppress_logs_and_warning in cli when debugging (#13180)