Hello,

Our Helm Chart uses the command that is deleted in Airflow 2.0. We should consider what we want to do with it - add this command again or delete the reference to this command in the Helm Chart.
https://github.com/apache/airflow/blob/d41c6a46b176a80e1cdb0bcc592f5a8baec21c41/chart/templates/scheduler/scheduler-deployment.yaml#L177-L197
Related PR: 
https://github.com/apache/airflow/pull/6843

Best regards,
Kamil Breguła
CC: @dstandish 
airflow/cli/cli_parser.py
help='Configure pool',
        func=lazy_load_command('airflow.cli.commands.pool_command.pool_set'),
        args=(ARG_POOL_NAME, ARG_POOL_SLOTS, ARG_POOL_DESCRIPTION, ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name='delete',
        help='Delete pool',
        func=lazy_load_command('airflow.cli.commands.pool_command.pool_delete'),
        args=(ARG_POOL_NAME, ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name='import',
        help='Import pools',
        func=lazy_load_command('airflow.cli.commands.pool_command.pool_import'),
        args=(ARG_POOL_IMPORT, ARG_VERBOSE),
    ),
    ActionCommand(
        name='export',
        help='Export all pools',
        func=lazy_load_command('airflow.cli.commands.pool_command.pool_export'),
        args=(ARG_POOL_EXPORT,),
    ),
)
VARIABLES_COMMANDS = (
    ActionCommand(
        name='list',
        help='List variables',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_list'),
        args=(ARG_OUTPUT, ARG_VERBOSE),
    ),