**Update**

We discussed and decide this CLI should always only clean up pods created by Airflow.

<hr>

### Description

Currently command `kubernetes cleanup-pods` cleans up Pods that meet specific conditions in a given namespace.

Underlying code: https://github.com/apache/airflow/blob/2.0.1/airflow/cli/commands/kubernetes_command.py#L70

### Use case / motivation

The problem to me is: users may have other non-Airflow stuff running in this specific namespace, and they may want to have different strategy/logic for Pod cleaning-up for these non-Airflow pods.

We may want to have an additional boolean flag for this command, like `--only-airflow-pods`, so that users can decide if they only want to clean up Airflow-created Pods.

It should not be hard to identify Airflow-created pods, given the specific labels Airflow adds to the Pods it creates (https://github.com/apache/airflow/blob/2.0.1/airflow/kubernetes/pod_generator.py#L385)




airflow/cli/cli_parser.py
),
    ActionCommand(
        name='backfill',
        help="Run subsections of a DAG for a specified date range",
        description=(
            "Run subsections of a DAG for a specified date range. If reset_dag_run option is used, "
            "backfill will first prompt users whether airflow should clear all the previous dag_run and "
            "task_instances within the backfill date range. If rerun_failed_tasks is used, backfill "
            "will auto re-run the previous failed task instances  within the backfill date range"
        ),
        func=lazy_load_command('airflow.cli.commands.dag_command.dag_backfill'),
        args=(
            ARG_DAG_ID,
            ARG_TASK_REGEX,
            ARG_START_DATE,
            ARG_END_DATE,
            ARG_MARK_SUCCESS,
            ARG_LOCAL,
            ARG_DONOT_PICKLE,
            ARG_YES,
            ARG_BF_IGNORE_DEPENDENCIES,
            ARG_BF_IGNORE_FIRST_DEPENDS_ON_PAST,
            ARG_SUBDIR,
            ARG_POOL,
            ARG_DELAY_ON_LIMIT,
            ARG_DRY_RUN,
            ARG_VERBOSE,
            ARG_CONF,
            ARG_RESET_DAG_RUN,
            ARG_RERUN_FAILED_TASKS,