Extra links supported for operators coming from third-party packages:

airflow.serialization.serialized_objects.BUILTIN_OPERATOR_EXTRA_LINKS

airflow/cli/cli_parser.py
"""Single CLI command"""
    name: str
    help: str
    func: Callable
    args: Iterable[Arg]
    description: Optional[str] = None
    epilog: Optional[str] = None
class GroupCommand(NamedTuple):
    """ClI command with subcommands"""
    name: str
    help: str
    subcommands: Iterable
    description: Optional[str] = None
    epilog: Optional[str] = None
CLICommand = Union[ActionCommand, GroupCommand]
DAGS_COMMANDS = (
    ActionCommand(
        name='list',
        help="List all the DAGs",
        func=lazy_load_command('airflow.cli.commands.dag_command.dag_list_dags'),
        args=(ARG_SUBDIR, ARG_OUTPUT),
    ),
    ActionCommand(
        name='report',
        help='Show DagBag loading report',
        func=lazy_load_command('airflow.cli.commands.dag_command.dag_report'),
        args=(ARG_SUBDIR, ARG_OUTPUT),
    ),