https://airflow.apache.org/docs/apache-airflow/stable/configurations-ref.html#store-dag-code

![Captura de pantalla 2021-05-26 a las 17 47 56](https://user-images.githubusercontent.com/11339132/119691160-a2049a00-be4a-11eb-8f55-0ad2c6117620.png)

The Default is True or None?
tests/core/test_configuration.py
def make_config():
            test_conf = AirflowConfigParser(default_config='')
            
            
            test_conf.deprecated_values = {
                'core': {
                    'hostname_callable': (re.compile(r':'), r'.', '2.1'),
                },
            }
            test_conf.read_dict(
                {
                    'core': {
                        'executor': 'SequentialExecutor',
                        'sql_alchemy_conn': 'sqlite://',
                        'hostname_callable': 'socket:getfqdn',
                    },
                }
            )
            test_conf.validate()
            return test_conf
        with pytest.warns(FutureWarning):
            test_conf = make_config()
            assert test_conf.get('core', 'hostname_callable') == 'socket.getfqdn'