**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
ARG_FILE_IO = Arg(
    ('--file-io',), help='Send output to file.io service and returns link.', action='store_true'
)
# config
ARG_SECTION = Arg(
    ("section",),
    help="The section name",
)
ARG_OPTION = Arg(
    ("option",),
    help="The option name",
)
# kubernetes cleanup-pods
ARG_NAMESPACE = Arg(
    ("--namespace",),
    default=conf.get('kubernetes', 'namespace'),
    help="Kubernetes Namespace. Default value is `[kubernetes] namespace` in configuration.",
)
# jobs check
ARG_JOB_TYPE_FILTER = Arg(
    ('--job-type',),
    choices=('BackfillJob', 'LocalTaskJob', 'SchedulerJob'),
    action='store',
    help='The type of job(s) that will be checked.',
)
ARG_JOB_HOSTNAME_FILTER = Arg(
    ("--hostname",),
    default=None,
    type=str,
    help="The hostname of job(s) that will be checked.",