code: def get_lookup_values(self, resource, lookup_name):
          
          return self._make_metadata_request(meta_id=resource + ':' + lookup_name, metadata_type='METADATA-LOOKUP_TYPE')
docs: Get possible lookup values for a given field
          :param resource: The name of the resource
          :param lookup_name: The name of the the field to get lookup values for
          :return: list