Apache Airflow 2.1.1

Bug Fixes

• Don't crash attempting to mask secrets in dict with non-string keys (#16601)
• Always install sphinx_airflow_theme from PyPI (#16594)
• Remove limitation for elasticsearch library (#16553)
• Adding extra requirements for build and runtime of the PROD image. (#16170)
• Cattrs 1.7.0 released by the end of May 2021 break lineage usage (#16173)
• Removes unnecessary packages from setup_requires (#16139)
• Pins docutils to <0.17 until breaking behaviour is fixed (#16133)
• Improvements for Docker Image docs (#14843)
• Ensure that dag_run.conf is a dict (#15057)
• Fix CLI connections import and migrate logic from secrets to Connection model (#15425)
• Fix Dag Details start date bug (#16206)
• Fix DAG run state not updated while DAG is paused (#16343)
• Allow null value for operator field in task_instance schema(REST API) (#16516)
• Avoid recursion going too deep when redacting logs (#16491)
• Backfill: Don't create a DagRun if no tasks match task regex (#16461)
• Tree View UI for larger DAGs & more consistent spacing in Tree View (#16522)
• Correctly handle None returns from Query.scalar() (#16345)
• Adding only_active parameter to /dags endpoint (#14306)
• Don't show stale Serialized DAGs if they are deleted in DB (#16368)
• Make REST API List DAGs endpoint consistent with UI/CLI behaviour (#16318)
• Support remote logging in elasticsearch with filebeat 7 (#14625)
• Queue tasks with higher priority and earlier execution_date first. (#15210)
• Make task ID on legend have enough width and width of line chart to be 100%. (#15915)
• Fix normalize-url vulnerability (#16375)
• Validate retries value on init for better errors (#16415)
• add num_runs query param for tree refresh (#16437)
• Fix templated default/example values in config ref docs (#16442)
• Add passphrase and private_key to default sensitive field names (#16392)
• Fix tasks in an infinite slots pool were never scheduled (#15247)
• Fix Orphaned tasks stuck in CeleryExecutor as running (#16550)
• Don't fail to log if we can't redact something (#16118)
• Set max tree width to 1200 pixels (#16067)
• Fill the "job_id" field for airflow task run without --local/--raw for KubeExecutor (#16108)
• Fixes problem where conf variable was used before initialization (#16088)
• Fix apply defaults for task decorator (#16085)
• Parse recently modified files even if just parsed (#16075)
• Ensure that we don't try to mask empty string in logs (#16057)
• Don't die when masking log.exception when there is no exception (#16047)
• Restores apply_defaults import in base_sensor_operator (#16040)
• Fix auto-refresh in tree view When webserver ui is not in / (#16018)
• Fix dag.clear() to set multiple dags to running when necessary (#15382)
• Fix Celery executor getting stuck randomly because of reset_signals in multiprocessing (#15989)