config.yml

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---

- name: core
  description: ~
  options:
    - name: dags_folder
      description: |
        The folder where your airflow pipelines live, most likely a
        subfolder in a code repository. This path must be absolute.
      version_added: ~
      type: string
      example: ~
      default: "{AIRFLOW_HOME}/dags"
    - name: hostname_callable
      description: |
        Hostname by providing a path to a callable, which will resolve the hostname.
        The format is "package.function".

        For example, default value "socket.getfqdn" means that result from getfqdn() of "socket"
        package will be used as hostname.

        No argument should be required in the function specified.
        If using IP address as hostname is preferred, use value ``airflow.utils.net.get_host_ip_address``
      version_added: ~
      type: string
      example: ~
      default: "socket.getfqdn"
    - name: default_timezone
      description: |
        Default timezone in case supplied date times are naive
        can be utc (default), system, or any IANA timezone string (e.g. Europe/Amsterdam)
      version_added: ~
      type: string
      example: ~
      default: "utc"
    - name: executor
      description: |
        The executor class that airflow should use. Choices include
        ``SequentialExecutor``, ``LocalExecutor``, ``CeleryExecutor``, ``DaskExecutor``,
        ``KubernetesExecutor``, ``CeleryKubernetesExecutor`` or the
        full import path to the class when using a custom executor.
      version_added: ~
      type: string
      example: ~
      default: "SequentialExecutor"
    - name: sql_alchemy_conn
      description: |
        The SqlAlchemy connection string to the metadata database.
        SqlAlchemy supports many different database engines.
        More information here:
        http://airflow.apache.org/docs/apache-airflow/stable/howto/set-up-database.html#database-uri
      version_added: ~
      type: string
      sensitive: true
      example: ~
      default: "sqlite:///{AIRFLOW_HOME}/airflow.db"
    - name: sql_engine_encoding
      description: |
        The encoding for the databases
      version_added: 1.10.1
      type: string
      example: ~
      default: "utf-8"
    - name: sql_engine_collation_for_ids
      description: |
        Collation for ``dag_id``, ``task_id``, ``key`` columns in case they have different encoding.
        This is particularly useful in case of mysql with utf8mb4 encoding because
        primary keys for XCom table has too big size and ``sql_engine_collation_for_ids`` should
        be set to ``utf8mb3_general_ci``.
      version_added: 2.0.0
      type: string
      example: ~
      default: ~
    - name: sql_alchemy_pool_enabled
      description: |
        If SqlAlchemy should pool database connections.
      version_added: ~
      type: string
      example: ~
      default: "True"
    - name: sql_alchemy_pool_size
      description: |
        The SqlAlchemy pool size is the maximum number of database connections
        in the pool. 0 indicates no limit.
      version_added: ~
      type: string
      example: ~
      default: "5"
    - name: sql_alchemy_max_overflow
      description: |
        The maximum overflow size of the pool.
        When the number of checked-out connections reaches the size set in pool_size,
        additional connections will be returned up to this limit.
        When those additional connections are returned to the pool, they are disconnected and discarded.
        It follows then that the total number of simultaneous connections the pool will allow
        is pool_size + max_overflow,
        and the total number of "sleeping" connections the pool will allow is pool_size.
        max_overflow can be set to ``-1`` to indicate no overflow limit;
        no limit will be placed on the total number of concurrent connections. Defaults to ``10``.
      version_added: 1.10.4
      type: string
      example: ~
      default: "10"
    - name: sql_alchemy_pool_recycle
      description: |
        The SqlAlchemy pool recycle is the number of seconds a connection
        can be idle in the pool before it is invalidated. This config does
        not apply to sqlite. If the number of DB connections is ever exceeded,
        a lower config value will allow the system to recover faster.
      version_added: ~
      type: string
      example: ~
      default: "1800"
    - name: sql_alchemy_pool_pre_ping
      description: |
        Check connection at the start of each connection pool checkout.
        Typically, this is a simple statement like "SELECT 1".
        More information here:
        https://docs.sqlalchemy.org/en/13/core/pooling.html#disconnect-handling-pessimistic
      version_added: 1.10.6
      type: string
      example: ~
      default: "True"
    - name: sql_alchemy_schema
      description: |
        The schema to use for the metadata database.
        SqlAlchemy supports databases with the concept of multiple schemas.
      version_added: 1.10.3
      type: string
      example: ~
      default: ""
    - name: sql_alchemy_connect_args
      description: |
        Import path for connect args in SqlAlchemy. Defaults to an empty dict.
        This is useful when you want to configure db engine args that SqlAlchemy won't parse
        in connection string.
        See https://docs.sqlalchemy.org/en/13/core/engines.html#sqlalchemy.create_engine.params.connect_args
      version_added: 1.10.11
      type: string
      example: ~
      default: ~
    - name: parallelism
      description: |
        This defines the maximum number of task instances that can run concurrently in Airflow
        regardless of scheduler count and worker count. Generally, this value is reflective of
        the number of task instances with the running state in the metadata database.
      version_added: ~
      type: string
      example: ~
      default: "32"
    - name: dag_concurrency
      description: |
        The maximum number of task instances allowed to run concurrently in each DAG. To calculate
        the number of tasks that is running concurrently for a DAG, add up the number of running
        tasks for all DAG runs of the DAG. This is configurable at the DAG level with ``concurrency``,
        which is defaulted as ``dag_concurrency``.
      version_added: ~
      type: string
      example: ~
      default: "16"
    - name: dags_are_paused_at_creation
      description: |
        Are DAGs paused by default at creation
      version_added: ~
      type: string
      example: ~
      default: "True"
    - name: max_active_runs_per_dag
      description: |
        The maximum number of active DAG runs per DAG. The scheduler will not create more DAG runs
        if it reaches the limit. This is configurable at the DAG level with ``max_active_runs``,
        which is defaulted as ``max_active_runs_per_dag``.
      version_added: ~
      type: string
      example: ~
      default: "16"
    - name: load_examples
      description: |
        Whether to load the DAG examples that ship with Airflow. It's good to
        get started, but you probably want to set this to ``False`` in a production
        environment
      version_added: ~
      type: string
      example: ~
      default: "True"
    - name: load_default_connections
      description: |
        Whether to load the default connections that ship with Airflow. It's good to
        get started, but you probably want to set this to ``False`` in a production
        environment
      version_added: 1.10.10
      type: string
      example: ~
      default: "True"
    - name: plugins_folder
      description: |
        Path to the folder containing Airflow plugins
      version_added: ~
      type: string
      example: ~
      default: "{AIRFLOW_HOME}/plugins"
    - name: execute_tasks_new_python_interpreter
      description: |
        Should tasks be executed via forking of the parent process ("False",
        the speedier option) or by spawning a new python process ("True" slow,
        but means plugin changes picked up by tasks straight away)
      default: "False"
      example: ~
      version_added: "2.0.0"
      see_also: ":ref:`plugins:loading`"
      type: boolean
    - name: fernet_key
      description: |
        Secret key to save connection passwords in the db
      version_added: ~
      type: string
      sensitive: true
      example: ~
      default: "{FERNET_KEY}"
    - name: donot_pickle
      description: |
        Whether to disable pickling dags
      version_added: ~
      type: string
      example: ~
      default: "True"
    - name: dagbag_import_timeout
      description: |
        How long before timing out a python file import
      version_added: ~
      type: float
      example: ~
      default: "30.0"
    - name: dagbag_import_error_tracebacks
      description: |
        Should a traceback be shown in the UI for dagbag import errors,
        instead of just the exception message
      version_added: 2.0.0
      type: boolean
      example: ~
      default: "True"
    - name: dagbag_import_error_traceback_depth
      description: |
        If tracebacks are shown, how many entries from the traceback should be shown
      version_added: 2.0.0
      type: integer
      example: ~
      default: "2"
    - name: dag_file_processor_timeout
      description: |
        How long before timing out a DagFileProcessor, which processes a dag file
      version_added: 1.10.6
      type: string
      example: ~
      default: "50"
    - name: task_runner
      description: |
        The class to use for running task instances in a subprocess.
        Choices include StandardTaskRunner, CgroupTaskRunner or the full import path to the class
        when using a custom task runner.
      version_added: ~
      type: string
      example: ~
      default: "StandardTaskRunner"
    - name: default_impersonation
      description: |
        If set, tasks without a ``run_as_user`` argument will be run with this user
        Can be used to de-elevate a sudo user running Airflow when executing tasks
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: security
      description: |
        What security module to use (for example kerberos)
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: unit_test_mode
      description: |
        Turn unit test mode on (overwrites many configuration options with test
        values at runtime)
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: enable_xcom_pickling
      description: |
        Whether to enable pickling for xcom (note that this is insecure and allows for
        RCE exploits).
      version_added: ~
      type: string
      example: ~
      default: "False"
      see_also: "https://docs.python.org/3/library/pickle.html#comparison-with-json"
    - name: killed_task_cleanup_time
      description: |
        When a task is killed forcefully, this is the amount of time in seconds that
        it has to cleanup after it is sent a SIGTERM, before it is SIGKILLED
      version_added: ~
      type: string
      example: ~
      default: "60"
    - name: dag_run_conf_overrides_params
      description: |
        Whether to override params with dag_run.conf. If you pass some key-value pairs
        through ``airflow dags backfill -c`` or
        ``airflow dags trigger -c``, the key-value pairs will override the existing ones in params.
      version_added: ~
      type: string
      example: ~
      default: "True"
    - name: dag_discovery_safe_mode
      description: |
        When discovering DAGs, ignore any files that don't contain the strings ``DAG`` and ``airflow``.
      version_added: 1.10.3
      type: string
      example: ~
      default: "True"
    - name: default_task_retries
      description: |
        The number of retries each task is going to have by default. Can be overridden at dag or task level.
      version_added: 1.10.6
      type: string
      example: ~
      default: "0"
    - name: min_serialized_dag_update_interval
      description: |
        Updating serialized DAG can not be faster than a minimum interval to reduce database write rate.
      version_added: 1.10.7
      type: string
      example: ~
      default: "30"
    - name: min_serialized_dag_fetch_interval
      description: |
        Fetching serialized DAG can not be faster than a minimum interval to reduce database
        read rate. This config controls when your DAGs are updated in the Webserver
      version_added: 1.10.12
      type: string
      example: ~
      default: "10"
    - name: store_dag_code
      description: |
        Whether to persist DAG files code in DB.
        If set to True, Webserver reads file contents from DB instead of
        trying to access files in a DAG folder.
        (Default is ``True``)
      version_added: 1.10.10
      type: string
      example: "True"
      default: ~
    - name: max_num_rendered_ti_fields_per_task
      description: |
        Maximum number of Rendered Task Instance Fields (Template Fields) per task to store
        in the Database.
        All the template_fields for each of Task Instance are stored in the Database.
        Keeping this number small may cause an error when you try to view ``Rendered`` tab in
        TaskInstance view for older tasks.
      version_added: 2.0.0
      type: integer
      example: ~
      default: "30"
    - name: check_slas
      description: |
        On each dagrun check against defined SLAs
      version_added: 1.10.8
      type: string
      example: ~
      default: "True"
    - name: xcom_backend
      description: |
        Path to custom XCom class that will be used to store and resolve operators results
      version_added: 1.10.12
      type: string
      example: "path.to.CustomXCom"
      default: "airflow.models.xcom.BaseXCom"
    - name: lazy_load_plugins
      description: |
        By default Airflow plugins are lazily-loaded (only loaded when required). Set it to ``False``,
        if you want to load plugins whenever 'airflow' is invoked via cli or loaded from module.
      version_added: 2.0.0
      type: boolean
      example: ~
      default: "True"
    - name: lazy_discover_providers
      description: |
        By default Airflow providers are lazily-discovered (discovery and imports happen only when required).
        Set it to False, if you want to discover providers whenever 'airflow' is invoked via cli or
        loaded from module.
      version_added: 2.0.0
      type: boolean
      example: ~
      default: "True"
    - name: max_db_retries
      description: |
        Number of times the code should be retried in case of DB Operational Errors.
        Not all transactions will be retried as it can cause undesired state.
        Currently it is only used in ``DagFileProcessor.process_file`` to retry ``dagbag.sync_to_db``.
      version_added: ~
      type: integer
      example: ~
      default: "3"
    - name: hide_sensitive_var_conn_fields
      description: |
        Hide sensitive Variables or Connection extra json keys from UI and task logs when set to True

        (Connection passwords are always hidden in logs)
      version_added: ~
      type: boolean
      example: ~
      default: "True"
    - name: sensitive_var_conn_names
      description: |
        A comma-separated list of extra sensitive keywords to look for in variables names or connection's
        extra JSON.
      version_added: ~
      type: string
      example: ~
      default: ""

- name: logging
  description: ~
  options:
    - name: base_log_folder
      description: |
        The folder where airflow should store its log files
        This path must be absolute
      version_added: ~
      type: string
      example: ~
      default: "{AIRFLOW_HOME}/logs"
    - name: remote_logging
      description: |
        Airflow can store logs remotely in AWS S3, Google Cloud Storage or Elastic Search.
        Set this to True if you want to enable remote logging.
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: remote_log_conn_id
      description: |
        Users must supply an Airflow connection id that provides access to the storage
        location.
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: google_key_path
      description: |
        Path to Google Credential JSON file. If omitted, authorization based on `the Application Default
        Credentials
        <https://cloud.google.com/docs/authentication/production#finding_credentials_automatically>`__ will
        be used.
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: remote_base_log_folder
      description: |
        Storage bucket URL for remote logging
        S3 buckets should start with "s3://"
        Cloudwatch log groups should start with "cloudwatch://"
        GCS buckets should start with "gs://"
        WASB buckets should start with "wasb" just to help Airflow select correct handler
        Stackdriver logs should start with "stackdriver://"
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: encrypt_s3_logs
      description: |
        Use server-side encryption for logs stored in S3
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: logging_level
      description: |
        Logging level.

        Supported values: ``CRITICAL``, ``ERROR``, ``WARNING``, ``INFO``, ``DEBUG``.
      version_added: ~
      type: string
      example: ~
      default: "INFO"
    - name: fab_logging_level
      description: |
        Logging level for Flask-appbuilder UI.

        Supported values: ``CRITICAL``, ``ERROR``, ``WARNING``, ``INFO``, ``DEBUG``.
      version_added: ~
      type: string
      example: ~
      default: "WARN"
    - name: logging_config_class
      description: |
        Logging class
        Specify the class that will specify the logging configuration
        This class has to be on the python classpath
      version_added: ~
      type: string
      example: "my.path.default_local_settings.LOGGING_CONFIG"
      default: ""
    - name: colored_console_log
      description: |
        Flag to enable/disable Colored logs in Console
        Colour the logs when the controlling terminal is a TTY.
      version_added: 1.10.4
      type: string
      example: ~
      default: "True"
    - name: colored_log_format
      description: |
        Log format for when Colored logs is enabled
      version_added: 1.10.4
      type: string
      example: ~
      default: >-
        [%%(blue)s%%(asctime)s%%(reset)s] {{%%(blue)s%%(filename)s:%%(reset)s%%(lineno)d}}
        %%(log_color)s%%(levelname)s%%(reset)s - %%(log_color)s%%(message)s%%(reset)s
    - name: colored_formatter_class
      description: ~
      version_added: 1.10.4
      type: string
      example: ~
      default: "airflow.utils.log.colored_log.CustomTTYColoredFormatter"
    - name: log_format
      description: |
        Format of Log line
      version_added: ~
      type: string
      example: ~
      default: "[%%(asctime)s] {{%%(filename)s:%%(lineno)d}} %%(levelname)s - %%(message)s"
    - name: simple_log_format
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "%%(asctime)s %%(levelname)s - %%(message)s"
    - name: task_log_prefix_template
      description: |
        Specify prefix pattern like mentioned below with stream handler TaskHandlerWithCustomFormatter
      version_added: ~
      type: string
      example: "{{ti.dag_id}}-{{ti.task_id}}-{{execution_date}}-{{try_number}}"
      default: ""
    - name: log_filename_template
      description: |
        Formatting for how airflow generates file names/paths for each task run.
      version_added: ~
      type: string
      example: ~
      default: "{{{{ ti.dag_id }}}}/{{{{ ti.task_id }}}}/{{{{ ts }}}}/{{{{ try_number }}}}.log"
    - name: log_processor_filename_template
      description: |
        Formatting for how airflow generates file names for log
      version_added: ~
      type: string
      example: ~
      default: "{{{{ filename }}}}.log"
    - name: dag_processor_manager_log_location
      description: |
        full path of dag_processor_manager logfile
      version_added: 1.10.2
      type: string
      example: ~
      default: "{AIRFLOW_HOME}/logs/dag_processor_manager/dag_processor_manager.log"
    - name: task_log_reader
      description: |
        Name of handler to read task instance logs.
        Defaults to use ``task`` handler.
      version_added: ~
      type: string
      example: ~
      default: "task"
    - name: extra_loggers
      description: |
        A comma\-separated list of third-party logger names that will be configured to print messages to
        consoles\.
      version_added: ~
      type: string
      example: "connexion,sqlalchemy"
      default: ""
- name: metrics
  description: |
    StatsD (https://github.com/etsy/statsd) integration settings.
  options:
    - name: statsd_on
      description: |
        Enables sending metrics to StatsD.
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: statsd_host
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "localhost"
    - name: statsd_port
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "8125"
    - name: statsd_prefix
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "airflow"
    - name: statsd_allow_list
      description: |
        If you want to avoid sending all the available metrics to StatsD,
        you can configure an allow list of prefixes (comma separated) to send only the metrics that
        start with the elements of the list (e.g: "scheduler,executor,dagrun")
      version_added: 1.10.6
      type: string
      example: ~
      default: ""
    - name: stat_name_handler
      description: |
        A function that validate the statsd stat name, apply changes to the stat name if necessary and return
        the transformed stat name.

        The function should have the following signature:
        def func_name(stat_name: str) -> str:
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: statsd_datadog_enabled
      description: |
        To enable datadog integration to send airflow metrics.
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: statsd_datadog_tags
      description: |
        List of datadog tags attached to all metrics(e.g: key1:value1,key2:value2)
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: statsd_custom_client_path
      description: |
        If you want to utilise your own custom Statsd client set the relevant
        module path below.
        Note: The module path must exist on your PYTHONPATH for Airflow to pick it up
      version_added: ~
      type: string
      example: ~
      default: ~
- name: secrets
  description: ~
  options:
    - name: backend
      description: |
        Full class name of secrets backend to enable (will precede env vars and metastore in search path)
      version_added: 1.10.10
      type: string
      example: "airflow.providers.amazon.aws.secrets.systems_manager.SystemsManagerParameterStoreBackend"
      default: ""
    - name: backend_kwargs
      description: |
        The backend_kwargs param is loaded into a dictionary and passed to __init__ of secrets backend class.
        See documentation for the secrets backend you are using. JSON is expected.
        Example for AWS Systems Manager ParameterStore:
        ``{{"connections_prefix": "/airflow/connections", "profile_name": "default"}}``
      version_added: 1.10.10
      type: string
      example: ~
      default: ""
- name: cli
  description: ~
  options:
    - name: api_client
      description: |
        In what way should the cli access the API. The LocalClient will use the
        database directly, while the json_client will use the api running on the
        webserver
      version_added: ~
      type: string
      example: ~
      default: "airflow.api.client.local_client"
    - name: endpoint_url
      description: |
        If you set web_server_url_prefix, do NOT forget to append it here, ex:
        ``endpoint_url = http://localhost:8080/myroot``
        So api will look like: ``http://localhost:8080/myroot/api/experimental/...``
      version_added: ~
      type: string
      example: ~
      default: "http://localhost:8080"
- name: debug
  description: ~
  options:
    - name: fail_fast
      description: |
        Used only with ``DebugExecutor``. If set to ``True`` DAG will fail with first
        failed task. Helpful for debugging purposes.
      version_added: 1.10.8
      type: string
      example: ~
      default: "False"
- name: api
  description: ~
  options:
    - name: enable_experimental_api
      description: |
        Enables the deprecated experimental API. Please note that these APIs do not have access control.
        The authenticated user has full access.

        .. warning::

          This `Experimental REST API <https://airflow.readthedocs.io/en/latest/rest-api-ref.html>`__ is
          deprecated since version 2.0. Please consider using
          `the Stable REST API <https://airflow.readthedocs.io/en/latest/stable-rest-api-ref.html>`__.
          For more information on migration, see
          `UPDATING.md <https://github.com/apache/airflow/blob/master/UPDATING.md>`_
      version_added: 2.0.0
      type: boolean
      example: ~
      default: "False"
    - name: auth_backend
      description: |
        How to authenticate users of the API. See
        https://airflow.apache.org/docs/apache-airflow/stable/security.html for possible values.
        ("airflow.api.auth.backend.default" allows all requests for historic reasons)
      version_added: ~
      type: string
      example: ~
      default: "airflow.api.auth.backend.deny_all"
    - name: maximum_page_limit
      description: |
        Used to set the maximum page limit for API requests
      version_added: ~
      type: integer
      example: ~
      default: "100"
    - name: fallback_page_limit
      description: |
        Used to set the default page limit when limit is zero. A default limit
        of 100 is set on OpenApi spec. However, this particular default limit
        only work when limit is set equal to zero(0) from API requests.
        If no limit is supplied, the OpenApi spec default is used.
      type: integer
      example: ~
      version_added: ~
      default: "100"
    - name: google_oauth2_audience
      description: The intended audience for JWT token credentials used for authorization.
        This value must match on the client and server sides.
        If empty, audience will not be tested.
      type: string
      version_added: ~
      example: project-id-random-value.apps.googleusercontent.com
      default: ""
    - name: google_key_path
      description: |
        Path to Google Cloud Service Account key file (JSON). If omitted, authorization based on
        `the Application Default Credentials
        <https://cloud.google.com/docs/authentication/production#finding_credentials_automatically>`__ will
        be used.
      type: string
      version_added: ~
      example: /files/service-account-json
      default: ""
    - name: access_control_allow_headers
      description: |
        Used in response to a preflight request to indicate which HTTP
        headers can be used when making the actual request. This header is
        the server side response to the browser's
        Access-Control-Request-Headers header.
      type: string
      version_added: ~
      example: ~
      default: ""
    - name: access_control_allow_methods
      description: |
        Specifies the method or methods allowed when accessing the resource.
      type: string
      version_added: ~
      example: ~
      default: ""
    - name: access_control_allow_origin
      description: |
        Indicates whether the response can be shared with requesting code from the given origin.
      type: string
      version_added: ~
      example: ~
      default: ""
- name: lineage
  description: ~
  options:
    - name: backend
      description: |
        what lineage backend to use
      version_added: ~
      type: string
      example: ~
      default: ""
- name: atlas
  description: ~
  options:
    - name: sasl_enabled
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: host
      description: ~
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: port
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "21000"
    - name: username
      description: ~
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: password
      description: ~
      version_added: ~
      type: string
      sensitive: true
      example: ~
      default: ""
- name: operators
  description: ~
  options:
    - name: default_owner
      description: |
        The default owner assigned to each new operator, unless
        provided explicitly or passed via ``default_args``
      version_added: ~
      type: string
      example: ~
      default: "airflow"
    - name: default_cpus
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "1"
    - name: default_ram
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "512"
    - name: default_disk
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "512"
    - name: default_gpus
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "0"
    - name: default_queue
      description: |
        Default queue that tasks get assigned to and that worker listen on.
      version_added: ~
      type: string
      example: ~
      default: "default"
    - name: allow_illegal_arguments
      description: |
        Is allowed to pass additional/unused arguments (args, kwargs) to the BaseOperator operator.
        If set to False, an exception will be thrown, otherwise only the console message will be displayed.
      version_added: ~
      type: string
      example: ~
      default: "False"
- name: hive
  description: ~
  options:
    - name: default_hive_mapred_queue
      description: |
        Default mapreduce queue for HiveOperator tasks
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: mapred_job_name_template
      description: |
        Template for mapred_job_name in HiveOperator, supports the following named parameters
        hostname, dag_id, task_id, execution_date
      version_added: ~
      type: string
      example: ~
      default: ~
- name: webserver
  description: ~
  options:
    - name: base_url
      description: |
        The base url of your website as airflow cannot guess what domain or
        cname you are using. This is used in automated emails that
        airflow sends to point links to the right web server
      version_added: ~
      type: string
      example: ~
      default: "http://localhost:8080"
    - name: default_ui_timezone
      description: |
        Default timezone to display all dates in the UI, can be UTC, system, or
        any IANA timezone string (e.g. Europe/Amsterdam). If left empty the
        default value of core/default_timezone will be used
      version_added: 1.10.10
      type: string
      example: "America/New_York"
      # Default is left as UTC for now so the date's don't "suddenly" change on upgrade
      default: "UTC"
    - name: web_server_host
      description: |
        The ip specified when starting the web server
      version_added: ~
      type: string
      example: ~
      default: "0.0.0.0"
    - name: web_server_port
      description: |
        The port on which to run the web server
      version_added: ~
      type: string
      example: ~
      default: "8080"
    - name: web_server_ssl_cert
      description: |
        Paths to the SSL certificate and key for the web server. When both are
        provided SSL will be enabled. This does not change the web server port.
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: web_server_ssl_key
      description: |
        Paths to the SSL certificate and key for the web server. When both are
        provided SSL will be enabled. This does not change the web server port.
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: web_server_master_timeout
      description: |
        Number of seconds the webserver waits before killing gunicorn master that doesn't respond
      version_added: ~
      type: string
      example: ~
      default: "120"
    - name: web_server_worker_timeout
      description: |
        Number of seconds the gunicorn webserver waits before timing out on a worker
      version_added: ~
      type: string
      example: ~
      default: "120"
    - name: worker_refresh_batch_size
      description: |
        Number of workers to refresh at a time. When set to 0, worker refresh is
        disabled. When nonzero, airflow periodically refreshes webserver workers by
        bringing up new ones and killing old ones.
      version_added: ~
      type: string
      example: ~
      default: "1"
    - name: worker_refresh_interval
      description: |
        Number of seconds to wait before refreshing a batch of workers.
      version_added: ~
      type: string
      example: ~
      default: "6000"
    - name: reload_on_plugin_change
      description: |
        If set to True, Airflow will track files in plugins_folder directory. When it detects changes,
        then reload the gunicorn.
      version_added: 1.10.11
      type: boolean
      example: ~
      default: "False"
    - name: secret_key
      description: |
        Secret key used to run your flask app. It should be as random as possible. However, when running
        more than 1 instances of webserver, make sure all of them use the same ``secret_key`` otherwise
        one of them will error with "CSRF session token is missing".
      version_added: ~
      type: string
      sensitive: true
      example: ~
      default: "{SECRET_KEY}"
    - name: workers
      description: |
        Number of workers to run the Gunicorn web server
      version_added: ~
      type: string
      example: ~
      default: "4"
    - name: worker_class
      description: |
        The worker class gunicorn should use. Choices include
        sync (default), eventlet, gevent
      version_added: ~
      type: string
      example: ~
      default: "sync"
    - name: access_logfile
      description: |
        Log files for the gunicorn webserver. '-' means log to stderr.
      version_added: ~
      type: string
      example: ~
      default: "-"
    - name: error_logfile
      description: |
        Log files for the gunicorn webserver. '-' means log to stderr.
      version_added: ~
      type: string
      example: ~
      default: "-"
    - name: access_logformat
      description: |
        Access log format for gunicorn webserver.
        default format is %%(h)s %%(l)s %%(u)s %%(t)s "%%(r)s" %%(s)s %%(b)s "%%(f)s" "%%(a)s"
        documentation - https://docs.gunicorn.org/en/stable/settings.html#access-log-format
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: expose_config
      description: |
        Expose the configuration file in the web server
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: expose_hostname
      description: |
        Expose hostname in the web server
      version_added: 1.10.8
      type: string
      example: ~
      default: "True"
    - name: expose_stacktrace
      description: |
        Expose stacktrace in the web server
      version_added: 1.10.8
      type: string
      example: ~
      default: "True"
    - name: dag_default_view
      description: |
        Default DAG view. Valid values are: ``tree``, ``graph``, ``duration``, ``gantt``, ``landing_times``
      version_added: ~
      type: string
      example: ~
      default: "tree"
    - name: dag_orientation
      description: |
        Default DAG orientation. Valid values are:
        ``LR`` (Left->Right), ``TB`` (Top->Bottom), ``RL`` (Right->Left), ``BT`` (Bottom->Top)
      version_added: ~
      type: string
      example: ~
      default: "LR"
    - name: log_fetch_timeout_sec
      description: |
        The amount of time (in secs) webserver will wait for initial handshake
        while fetching logs from other worker machine
      version_added: ~
      type: string
      example: ~
      default: "5"
    - name: log_fetch_delay_sec
      description: |
        Time interval (in secs) to wait before next log fetching.
      version_added: 1.10.8
      type: integer
      example: ~
      default: "2"
    - name: log_auto_tailing_offset
      description: |
        Distance away from page bottom to enable auto tailing.
      version_added: 1.10.8
      type: integer
      example: ~
      default: "30"
    - name: log_animation_speed
      description: |
        Animation speed for auto tailing log display.
      version_added: 1.10.8
      type: integer
      example: ~
      default: "1000"
    - name: hide_paused_dags_by_default
      description: |
        By default, the webserver shows paused DAGs. Flip this to hide paused
        DAGs by default
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: page_size
      description: |
        Consistent page size across all listing views in the UI
      version_added: ~
      type: string
      example: ~
      default: "100"
    - name: navbar_color
      description: |
        Define the color of navigation bar
      version_added: ~
      type: string
      example: ~
      default: "#fff"
    - name: default_dag_run_display_number
      description: |
        Default dagrun to show in UI
      version_added: ~
      type: string
      example: ~
      default: "25"
    - name: enable_proxy_fix
      description: |
        Enable werkzeug ``ProxyFix`` middleware for reverse proxy
      version_added: 1.10.1
      type: boolean
      example: ~
      default: "False"
    - name: proxy_fix_x_for
      description: |
        Number of values to trust for ``X-Forwarded-For``.
        More info: https://werkzeug.palletsprojects.com/en/0.16.x/middleware/proxy_fix/
      version_added: 1.10.7
      type: integer
      example: ~
      default: "1"
    - name: proxy_fix_x_proto
      description: |
        Number of values to trust for ``X-Forwarded-Proto``
      version_added: 1.10.7
      type: integer
      example: ~
      default: "1"
    - name: proxy_fix_x_host
      description: |
        Number of values to trust for ``X-Forwarded-Host``
      version_added: 1.10.7
      type: integer
      example: ~
      default: "1"
    - name: proxy_fix_x_port
      description: |
        Number of values to trust for ``X-Forwarded-Port``
      version_added: 1.10.7
      type: integer
      example: ~
      default: "1"
    - name: proxy_fix_x_prefix
      description: |
        Number of values to trust for ``X-Forwarded-Prefix``
      version_added: 1.10.7
      type: integer
      example: ~
      default: "1"
    - name: cookie_secure
      description: |
        Set secure flag on session cookie
      version_added: 1.10.3
      type: string
      example: ~
      default: "False"
    - name: cookie_samesite
      description: |
        Set samesite policy on session cookie
      version_added: 1.10.3
      type: string
      example: ~
      default: "Lax"
    - name: default_wrap
      description: |
        Default setting for wrap toggle on DAG code and TI log views.
      version_added: 1.10.4
      type: boolean
      example: ~
      default: "False"
    - name: x_frame_enabled
      description: |
        Allow the UI to be rendered in a frame
      version_added: 1.10.8
      type: boolean
      example: ~
      default: "True"
    - name: analytics_tool
      description: |
        Send anonymous user activity to your analytics tool
        choose from google_analytics, segment, or metarouter
      version_added: ~
      type: string
      example: ~
      default: ~
    - name: analytics_id
      description: |
        Unique ID of your account in the analytics tool
      version_added: 1.10.5
      type: string
      example: ~
      default: ~
    - name: show_recent_stats_for_completed_runs
      description: |
        'Recent Tasks' stats will show for old DagRuns if set
      version_added: ~
      type: boolean
      example: ~
      default: "True"
    - name: update_fab_perms
      description: |
        Update FAB permissions and sync security manager roles
        on webserver startup
      version_added: 1.10.7
      type: string
      example: ~
      default: "True"
    - name: session_lifetime_minutes
      description: |
        The UI cookie lifetime in minutes. User will be logged out from UI after
        ``session_lifetime_minutes`` of non-activity
      version_added: 1.10.13
      type: integer
      example: ~
      default: "43200"
    - name: instance_name
      description: |
        Sets a custom page title for the DAGs overview page and site title for all pages
      version_added: 2.1.0
      type: string
      example: ~
      default:

- name: email
  description: |
    Configuration email backend and whether to
    send email alerts on retry or failure
  options:
    - name: email_backend
      description: Email backend to use
      version_added: ~
      type: string
      example: ~
      default: "airflow.utils.email.send_email_smtp"
    - name: email_conn_id
      description: Email connection to use
      version_added: ~
      type: string
      example: ~
      default: "smtp_default"
    - name: default_email_on_retry
      description: |
        Whether email alerts should be sent when a task is retried
      version_added: ~
      type: boolean
      example: ~
      default: "True"
    - name: default_email_on_failure
      description: |
        Whether email alerts should be sent when a task failed
      version_added: ~
      type: boolean
      example: ~
      default: "True"
    - name: subject_template
      description: |
        File that will be used as the template for Email subject (which will be rendered using Jinja2).
        If not set, Airflow uses a base template.
      version_added: ~
      type: string
      example: "/path/to/my_subject_template_file"
      default: ~
      see_also: ":doc:`Email Configuration </howto/email-config>`"
    - name: html_content_template
      description: |
        File that will be used as the template for Email content (which will be rendered using Jinja2).
        If not set, Airflow uses a base template.
      version_added: ~
      type: string
      example: "/path/to/my_html_content_template_file"
      default: ~
      see_also: ":doc:`Email Configuration </howto/email-config>`"

- name: smtp
  description: |
    If you want airflow to send emails on retries, failure, and you want to use
    the airflow.utils.email.send_email_smtp function, you have to configure an
    smtp server here
  options:
    - name: smtp_host
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "localhost"
    - name: smtp_starttls
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "True"
    - name: smtp_ssl
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: smtp_user
      description: ~
      version_added: ~
      type: string
      example: "airflow"
      default: ~
    - name: smtp_password
      description: ~
      version_added: ~
      type: string
      sensitive: true
      example: "airflow"
      default: ~
    - name: smtp_port
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "25"
    - name: smtp_mail_from
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "airflow@example.com"
    - name: smtp_timeout
      description: ~
      version_added: ~
      type: integer
      example: ~
      default: "30"
    - name: smtp_retry_limit
      description: ~
      version_added: ~
      type: integer
      example: ~
      default: "5"
- name: sentry
  description: |
    Sentry (https://docs.sentry.io) integration. Here you can supply
    additional configuration options based on the Python platform. See:
    https://docs.sentry.io/error-reporting/configuration/?platform=python.
    Unsupported options: ``integrations``, ``in_app_include``, ``in_app_exclude``,
    ``ignore_errors``, ``before_breadcrumb``, ``before_send``, ``transport``.
  options:
    - name: sentry_on
      description: Enable error reporting to Sentry
      version_added: ~
      type: string
      example: ~
      default: "false"
    - name: sentry_dsn
      description: ~
      version_added: 1.10.6
      type: string
      example: ~
      default: ""
- name: celery_kubernetes_executor
  description: |
    This section only applies if you are using the ``CeleryKubernetesExecutor`` in
    ``[core]`` section above
  options:
    - name: kubernetes_queue
      description: |
        Define when to send a task to ``KubernetesExecutor`` when using ``CeleryKubernetesExecutor``.
        When the queue of a task is the value of ``kubernetes_queue`` (default ``kubernetes``),
        the task is executed via ``KubernetesExecutor``,
        otherwise via ``CeleryExecutor``
      version_added: 2.0.0
      type: string
      example: ~
      default: "kubernetes"
- name: celery
  description: |
    This section only applies if you are using the CeleryExecutor in
    ``[core]`` section above
  options:
    - name: celery_app_name
      description: |
        The app name that will be used by celery
      version_added: ~
      type: string
      example: ~
      default: "airflow.executors.celery_executor"
    - name: worker_concurrency
      description: |
        The concurrency that will be used when starting workers with the
        ``airflow celery worker`` command. This defines the number of task instances that
        a worker will take, so size up your workers based on the resources on
        your worker box and the nature of your tasks
      version_added: ~
      type: string
      example: ~
      default: "16"
    - name: worker_autoscale
      description: |
        The maximum and minimum concurrency that will be used when starting workers with the
        ``airflow celery worker`` command (always keep minimum processes, but grow
        to maximum if necessary). Note the value should be max_concurrency,min_concurrency
        Pick these numbers based on resources on worker box and the nature of the task.
        If autoscale option is available, worker_concurrency will be ignored.
        http://docs.celeryproject.org/en/latest/reference/celery.bin.worker.html#cmdoption-celery-worker-autoscale
      version_added: ~
      type: string
      example: 16,12
      default: ~
    - name: worker_prefetch_multiplier
      description: |
        Used to increase the number of tasks that a worker prefetches which can improve performance.
        The number of processes multiplied by worker_prefetch_multiplier is the number of tasks
        that are prefetched by a worker. A value greater than 1 can result in tasks being unnecessarily
        blocked if there are multiple workers and one worker prefetches tasks that sit behind long
        running tasks while another worker has unutilized processes that are unable to process the already
        claimed blocked tasks.
        https://docs.celeryproject.org/en/stable/userguide/optimizing.html#prefetch-limits
      version_added: ~
      type: integer
      example: "1"
      default: ~
    - name: worker_log_server_port
      description: |
        When you start an airflow worker, airflow starts a tiny web server
        subprocess to serve the workers local log files to the airflow main
        web server, who then builds pages and sends them to users. This defines
        the port on which the logs are served. It needs to be unused, and open
        visible from the main web server to connect into the workers.
      version_added: ~
      type: string
      example: ~
      default: "8793"
    - name: worker_umask
      description: |
        Umask that will be used when starting workers with the ``airflow celery worker``
        in daemon mode. This control the file-creation mode mask which determines the initial
        value of file permission bits for newly created files.
      version_added: ~
      type: string
      example: ~
      default: "0o077"
    - name: broker_url
      description: |
        The Celery broker URL. Celery supports RabbitMQ, Redis and experimentally
        a sqlalchemy database. Refer to the Celery documentation for more information.
      version_added: ~
      type: string
      sensitive: true
      example: ~
      default: "redis://redis:6379/0"
    - name: result_backend
      description: |
        The Celery result_backend. When a job finishes, it needs to update the
        metadata of the job. Therefore it will post a message on a message bus,
        or insert it into a database (depending of the backend)
        This status is used by the scheduler to update the state of the task
        The use of a database is highly recommended
        http://docs.celeryproject.org/en/latest/userguide/configuration.html#task-result-backend-settings
      version_added: ~
      type: string
      sensitive: true
      example: ~
      default: "db+postgresql://postgres:airflow@postgres/airflow"
    - name: flower_host
      description: |
        Celery Flower is a sweet UI for Celery. Airflow has a shortcut to start
        it ``airflow celery flower``. This defines the IP that Celery Flower runs on
      version_added: ~
      type: string
      example: ~
      default: "0.0.0.0"
    - name: flower_url_prefix
      description: |
        The root URL for Flower
      version_added: ~
      type: string
      example: "/flower"
      default: ""
    - name: flower_port
      description: |
        This defines the port that Celery Flower runs on
      version_added: ~
      type: string
      example: ~
      default: "5555"
    - name: flower_basic_auth
      description: |
        Securing Flower with Basic Authentication
        Accepts user:password pairs separated by a comma
      version_added: 1.10.2
      type: string
      sensitive: true
      example: "user1:password1,user2:password2"
      default: ""
    - name: sync_parallelism
      description: |
        How many processes CeleryExecutor uses to sync task state.
        0 means to use max(1, number of cores - 1) processes.
      version_added: 1.10.3
      type: string
      example: ~
      default: "0"
    - name: celery_config_options
      description: |
        Import path for celery configuration options
      version_added: ~
      type: string
      example: ~
      default: "airflow.config_templates.default_celery.DEFAULT_CELERY_CONFIG"
    - name: ssl_active
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "False"
    - name: ssl_key
      description: ~
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: ssl_cert
      description: ~
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: ssl_cacert
      description: ~
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: pool
      description: |
        Celery Pool implementation.
        Choices include: ``prefork`` (default), ``eventlet``, ``gevent`` or ``solo``.
        See:
        https://docs.celeryproject.org/en/latest/userguide/workers.html#concurrency
        https://docs.celeryproject.org/en/latest/userguide/concurrency/eventlet.html
      version_added: 1.10.4
      type: string
      example: ~
      default: "prefork"
    - name: operation_timeout
      description: |
        The number of seconds to wait before timing out ``send_task_to_executor`` or
        ``fetch_celery_task_state`` operations.
      version_added: 1.10.8
      type: float
      example: ~
      default: "1.0"
    - name: task_track_started
      description: |
        Celery task will report its status as 'started' when the task is executed by a worker.
        This is used in Airflow to keep track of the running tasks and if a Scheduler is restarted
        or run in HA mode, it can adopt the orphan tasks launched by previous SchedulerJob.
      version_added: 2.0.0
      type: boolean
      example: ~
      default: "True"
    - name: task_adoption_timeout
      description: |
        Time in seconds after which Adopted tasks are cleared by CeleryExecutor. This is helpful to clear
        stalled tasks.
      version_added: 2.0.0
      type: integer
      example: ~
      default: "600"
    - name: task_publish_max_retries
      description: |
        The Maximum number of retries for publishing task messages to the broker when failing
        due to ``AirflowTaskTimeout`` error before giving up and marking Task as failed.
      version_added: 2.0.0
      type: integer
      example: ~
      default: "3"
    - name: worker_precheck
      description: |
        Worker initialisation check to validate Metadata Database connection
      version_added: 1.10.1
      type: string
      example: ~
      default: "False"
- name: celery_broker_transport_options
  description: |
    This section is for specifying options which can be passed to the
    underlying celery broker transport. See:
    http://docs.celeryproject.org/en/latest/userguide/configuration.html#std:setting-broker_transport_options
  options:
    - name: visibility_timeout
      description: |
        The visibility timeout defines the number of seconds to wait for the worker
        to acknowledge the task before the message is redelivered to another worker.
        Make sure to increase the visibility timeout to match the time of the longest
        ETA you're planning to use.
        visibility_timeout is only supported for Redis and SQS celery brokers.
        See:
        http://docs.celeryproject.org/en/master/userguide/configuration.html#std:setting-broker_transport_options
      version_added: ~
      type: string
      example: "21600"
      default: ~
- name: dask
  description: |
    This section only applies if you are using the DaskExecutor in
    [core] section above
  options:
    - name: cluster_address
      description: |
        The IP address and port of the Dask cluster's scheduler.
      version_added: ~
      type: string
      example: ~
      default: "127.0.0.1:8786"
    - name: tls_ca
      description: |
        TLS/ SSL settings to access a secured Dask scheduler.
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: tls_cert
      description: ~
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: tls_key
      description: ~
      version_added: ~
      type: string
      example: ~
      default: ""
- name: scheduler
  description: ~
  options:
    - name: job_heartbeat_sec
      description: |
        Task instances listen for external kill signal (when you clear tasks
        from the CLI or the UI), this defines the frequency at which they should
        listen (in seconds).
      version_added: ~
      type: string
      example: ~
      default: "5"
    - name: clean_tis_without_dagrun_interval
      description: |
        How often (in seconds) to check and tidy up 'running' TaskInstancess
        that no longer have a matching DagRun
      version_added: 2.0.0
      type: float
      example: ~
      default: "15.0"
    - name: scheduler_heartbeat_sec
      description: |
        The scheduler constantly tries to trigger new tasks (look at the
        scheduler section in the docs for more information). This defines
        how often the scheduler should run (in seconds).
      version_added: ~
      type: string
      example: ~
      default: "5"
    - name: num_runs
      description: |
        The number of times to try to schedule each DAG file
        -1 indicates unlimited number
      version_added: 1.10.6
      type: string
      example: ~
      default: "-1"
    - name: processor_poll_interval
      description: |
        The number of seconds to wait between consecutive DAG file processing
      version_added: 1.10.6
      type: string
      example: ~
      default: "1"
    - name: min_file_process_interval
      description: |
        Number of seconds after which a DAG file is parsed. The DAG file is parsed every
        ``min_file_process_interval`` number of seconds. Updates to DAGs are reflected after
        this interval. Keeping this number low will increase CPU usage.
      version_added: ~
      type: string
      example: ~
      default: "30"
    - name: dag_dir_list_interval
      description: |
        How often (in seconds) to scan the DAGs directory for new files. Default to 5 minutes.
      version_added: ~
      type: string
      example: ~
      default: "300"
    - name: print_stats_interval
      description: |
        How often should stats be printed to the logs. Setting to 0 will disable printing stats
      version_added: ~
      type: string
      example: ~
      default: "30"
    - name: pool_metrics_interval
      description: |
        How often (in seconds) should pool usage stats be sent to statsd (if statsd_on is enabled)
      version_added: 2.0.0
      type: float
      example: ~
      default: "5.0"
    - name: scheduler_health_check_threshold
      description: |
        If the last scheduler heartbeat happened more than scheduler_health_check_threshold
        ago (in seconds), scheduler is considered unhealthy.
        This is used by the health check in the "/health" endpoint
      version_added: 1.10.2
      type: string
      example: ~
      default: "30"
    - name: orphaned_tasks_check_interval
      description: |
        How often (in seconds) should the scheduler check for orphaned tasks and SchedulerJobs
      version_added: 2.0.0
      type: float
      example: ~
      default: "300.0"
    - name: child_process_log_directory
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "{AIRFLOW_HOME}/logs/scheduler"
    - name: scheduler_zombie_task_threshold
      description: |
        Local task jobs periodically heartbeat to the DB. If the job has
        not heartbeat in this many seconds, the scheduler will mark the
        associated task instance as failed and will re-schedule the task.
      version_added: ~
      type: string
      example: ~
      default: "300"
    - name: catchup_by_default
      description: |
        Turn off scheduler catchup by setting this to ``False``.
        Default behavior is unchanged and
        Command Line Backfills still work, but the scheduler
        will not do scheduler catchup if this is ``False``,
        however it can be set on a per DAG basis in the
        DAG definition (catchup)
      version_added: ~
      type: string
      example: ~
      default: "True"
    - name: max_tis_per_query
      description: |
        This changes the batch size of queries in the scheduling main loop.
        If this is too high, SQL query performance may be impacted by one
        or more of the following:
        - reversion to full table scan
        - complexity of query predicate
        - excessive locking
        Additionally, you may hit the maximum allowable query length for your db.
        Set this to 0 for no limit (not advised)
      version_added: ~
      type: string
      example: ~
      default: "512"
    - name: use_row_level_locking
      description: |
        Should the scheduler issue ``SELECT ... FOR UPDATE`` in relevant queries.
        If this is set to False then you should not run more than a single
        scheduler at once
      version_added: 2.0.0
      type: boolean
      example: ~
      default: "True"
    - name: max_dagruns_to_create_per_loop
      description: |
        Max number of DAGs to create DagRuns for per scheduler loop

        Default: 10
      example: ~
      version_added: 2.0.0
      type: string
      default: ~
      see_also: ":ref:`scheduler:ha:tunables`"
    - name: max_dagruns_per_loop_to_schedule
      description: |
        How many DagRuns should a scheduler examine (and lock) when scheduling
        and queuing tasks.

        Default: 20
      example: ~
      version_added: 2.0.0
      type: string
      default: ~
      see_also: ":ref:`scheduler:ha:tunables`"
    - name: schedule_after_task_execution
      description: |
        Should the Task supervisor process perform a "mini scheduler" to attempt to schedule more tasks of the
        same DAG. Leaving this on will mean tasks in the same DAG execute quicker, but might starve out other
        dags in some circumstances

        Default: True
      example: ~
      version_added: 2.0.0
      type: boolean
      default: ~
    - name: parsing_processes
      description: |
        The scheduler can run multiple processes in parallel to parse dags.
        This defines how many processes will run.
      version_added: 1.10.14
      type: string
      example: ~
      default: "2"
    - name: file_parsing_sort_mode
      description: |
        One of ``modified_time``, ``random_seeded_by_host`` and ``alphabetical``.
        The scheduler will list and sort the dag files to decide the parsing order.

        * ``modified_time``: Sort by modified time of the files. This is useful on large scale to parse the
          recently modified DAGs first.
        * ``random_seeded_by_host``: Sort randomly across multiple Schedulers but with same order on the
          same host. This is useful when running with Scheduler in HA mode where each scheduler can
          parse different DAG files.
        * ``alphabetical``: Sort by filename

      version_added: 2.1.0
      type: string
      example: ~
      default: "modified_time"
    - name: use_job_schedule
      description: |
        Turn off scheduler use of cron intervals by setting this to False.
        DAGs submitted manually in the web UI or with trigger_dag will still run.
      version_added: 1.10.2
      type: string
      example: ~
      default: "True"
    - name: allow_trigger_in_future
      description: |
        Allow externally triggered DagRuns for Execution Dates in the future
        Only has effect if schedule_interval is set to None in DAG
      version_added: 1.10.8
      type: string
      example: ~
      default: "False"
    - name: dependency_detector
      description: DAG dependency detector class to use
      version_added: ~
      type: string
      example: ~
      default: "airflow.serialization.serialized_objects.DependencyDetector"
- name: kerberos
  description: ~
  options:
    - name: ccache
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "/tmp/airflow_krb5_ccache"
    - name: principal
      description: |
        gets augmented with fqdn
      version_added: ~
      type: string
      example: ~
      default: "airflow"
    - name: reinit_frequency
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "3600"
    - name: kinit_path
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "kinit"
    - name: keytab
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "airflow.keytab"
- name: github_enterprise
  description: ~
  options:
    - name: api_rev
      description: ~
      version_added: ~
      type: string
      example: ~
      default: "v3"
- name: elasticsearch
  description: ~
  options:
    - name: host
      description: |
        Elasticsearch host
      version_added: 1.10.4
      type: string
      example: ~
      default: ""
    - name: log_id_template
      description: |
        Format of the log_id, which is used to query for a given tasks logs
      version_added: 1.10.4
      type: string
      example: ~
      default: "{{dag_id}}-{{task_id}}-{{execution_date}}-{{try_number}}"
    - name: end_of_log_mark
      description: |
        Used to mark the end of a log stream for a task
      version_added: 1.10.4
      type: string
      example: ~
      default: "end_of_log"
    - name: frontend
      description: |
        Qualified URL for an elasticsearch frontend (like Kibana) with a template argument for log_id
        Code will construct log_id using the log_id template from the argument above.
        NOTE: The code will prefix the https:// automatically, don't include that here.
      version_added: 1.10.4
      type: string
      example: ~
      default: ""
    - name: write_stdout
      description: |
        Write the task logs to the stdout of the worker, rather than the default files
      version_added: 1.10.4
      type: string
      example: ~
      default: "False"
    - name: json_format
      description: |
        Instead of the default log formatter, write the log lines as JSON
      version_added: 1.10.4
      type: string
      example: ~
      default: "False"
    - name: json_fields
      description: |
        Log fields to also attach to the json output, if enabled
      version_added: 1.10.4
      type: string
      example: ~
      default: "asctime, filename, lineno, levelname, message"
    - name: host_field
      description: |
        The field where host name is stored (normally either `host` or `host.name`)
      version_added: 2.1.1
      type: string
      example: ~
      default: "host"
    - name: offset_field
      description: |
        The field where offset is stored (normally either `offset` or `log.offset`)
      version_added: 2.1.1
      type: string
      example: ~
      default: "offset"
- name: elasticsearch_configs
  description: ~
  options:
    - name: use_ssl
      description: ~
      version_added: 1.10.5
      type: string
      example: ~
      default: "False"
    - name: verify_certs
      description: ~
      version_added: 1.10.5
      type: string
      example: ~
      default: "True"
- name: kubernetes
  description: ~
  options:
    - name: pod_template_file
      description: |
        Path to the YAML pod file. If set, all other kubernetes-related fields are ignored.
      version_added: 1.10.11
      type: string
      example: ~
      default: ""
    - name: worker_container_repository
      description: |
        The repository of the Kubernetes Image for the Worker to Run
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: worker_container_tag
      description: |
        The tag of the Kubernetes Image for the Worker to Run
      version_added: ~
      type: string
      example: ~
      default: ""
    - name: namespace
      description: |
        The Kubernetes namespace where airflow workers should be created. Defaults to ``default``
      version_added: ~
      type: string
      example: ~
      default: "default"
    - name: delete_worker_pods
      description: |
        If True, all worker pods will be deleted upon termination
      version_added: ~
      type: string
      example: ~
      default: "True"
    - name: delete_worker_pods_on_failure
      description: |
        If False (and delete_worker_pods is True),
        failed worker pods will not be deleted so users can investigate them.
        This only prevents removal of worker pods where the worker itself failed,
        not when the task it ran failed.
      version_added: 1.10.11
      type: string
      example: ~
      default: "False"
    - name: worker_pods_creation_batch_size
      description: |
        Number of Kubernetes Worker Pod creation calls per scheduler loop.
        Note that the current default of "1" will only launch a single pod
        per-heartbeat. It is HIGHLY recommended that users increase this
        number to match the tolerance of their kubernetes cluster for
        better performance.
      version_added: 1.10.3
      type: string
      example: ~
      default: "1"
    - name: multi_namespace_mode
      description: |
        Allows users to launch pods in multiple namespaces.
        Will require creating a cluster-role for the scheduler
      version_added: 1.10.12
      type: boolean
      example: ~
      default: "False"
    - name: in_cluster
      description: |
        Use the service account kubernetes gives to pods to connect to kubernetes cluster.
        It's intended for clients that expect to be running inside a pod running on kubernetes.
        It will raise an exception if called from a process not running in a kubernetes environment.
      version_added: ~
      type: string
      example: ~
      default: "True"
    - name: cluster_context
      description: |
        When running with in_cluster=False change the default cluster_context or config_file
        options to Kubernetes client. Leave blank these to use default behaviour like ``kubectl`` has.
      version_added: 1.10.3
      type: string
      example: ~
      default: ~
    - name: config_file
      description: |
        Path to the kubernetes configfile to be used when ``in_cluster`` is set to False
      version_added: 1.10.3
      type: string
      example: ~
      default: ~
    - name: kube_client_request_args
      description: |
        Keyword parameters to pass while calling a kubernetes client core_v1_api methods
        from Kubernetes Executor provided as a single line formatted JSON dictionary string.
        List of supported params are similar for all core_v1_apis, hence a single config
        variable for all apis. See:
        https://raw.githubusercontent.com/kubernetes-client/python/41f11a09995efcd0142e25946adc7591431bfb2f/kubernetes/client/api/core_v1_api.py
      version_added: 1.10.4
      type: string
      example: ~
      default: ""
    - name: delete_option_kwargs
      description: |
        Optional keyword arguments to pass to the ``delete_namespaced_pod`` kubernetes client
        ``core_v1_api`` method when using the Kubernetes Executor.
        This should be an object and can contain any of the options listed in the ``v1DeleteOptions``
        class defined here:
        https://github.com/kubernetes-client/python/blob/41f11a09995efcd0142e25946adc7591431bfb2f/kubernetes/client/models/v1_delete_options.py#L19
      version_added: 1.10.12
      type: string
      example: '{"grace_period_seconds": 10}'
      default: ""
    - name: enable_tcp_keepalive
      description: |
        Enables TCP keepalive mechanism. This prevents Kubernetes API requests to hang indefinitely
        when idle connection is time-outed on services like cloud load balancers or firewalls.
      version_added: ~
      type: boolean
      example: ~
      default: "True"
    - name: tcp_keep_idle
      description: |
        When the `enable_tcp_keepalive` option is enabled, TCP probes a connection that has
        been idle for `tcp_keep_idle` seconds.
      version_added: ~
      type: integer
      example: ~
      default: "120"
    - name: tcp_keep_intvl
      description: |
        When the `enable_tcp_keepalive` option is enabled, if Kubernetes API does not respond
        to a keepalive probe, TCP retransmits the probe after `tcp_keep_intvl` seconds.
      version_added: ~
      type: integer
      example: ~
      default: "30"
    - name: tcp_keep_cnt
      description: |
        When the `enable_tcp_keepalive` option is enabled, if Kubernetes API does not respond
        to a keepalive probe, TCP retransmits the probe `tcp_keep_cnt number` of times before
        a connection is considered to be broken.
      version_added: ~
      type: integer
      example: ~
      default: "6"
    - name: verify_ssl
      description: |
        Set this to false to skip verifying SSL certificate of Kubernetes python client.
      version_added: ~
      type: boolean
      example: ~
      default: "True"
    - name: worker_pods_pending_timeout
      description: |
        How long in seconds a worker can be in Pending before it is considered a failure
      version_added: 2.1.0
      type: integer
      example: ~
      default: "300"
    - name: worker_pods_pending_timeout_check_interval
      description: |
        How often in seconds to check if Pending workers have exceeded their timeouts
      version_added: 2.1.0
      type: integer
      example: ~
      default: "120"
    - name: worker_pods_pending_timeout_batch_size
      description: |
        How many pending pods to check for timeout violations in each check interval.
        You may want this higher if you have a very large cluster and/or use ``multi_namespace_mode``.
      version_added: 2.1.0
      type: integer
      example: ~
      default: "100"
- name: smart_sensor
  description: ~
  options:
    - name: use_smart_sensor
      description: |
        When `use_smart_sensor` is True, Airflow redirects multiple qualified sensor tasks to
        smart sensor task.
      version_added: 2.0.0
      type: boolean
      example: ~
      default: "False"
    - name: shard_code_upper_limit
      description: |
        `shard_code_upper_limit` is the upper limit of `shard_code` value. The `shard_code` is generated
        by `hashcode % shard_code_upper_limit`.
      version_added: 2.0.0
      type: integer
      example: ~
      default: "10000"
    - name: shards
      description: |
        The number of running smart sensor processes for each service.
      version_added: ~
      type: integer
      example: ~
      default: "5"
    - name: sensors_enabled
      description: |
        comma separated sensor classes support in smart_sensor.
      version_added: 2.0.0
      type: string
      example: ~
      default: "NamedHivePartitionSensor"