code: def _log_length_error(self, key, length):
          
          extra = {
              "max_detail_length": settings.defaults["max_detail_length"],
              "len": length
          }
          if self.key_name:
              extra[self.key_name] = key
          msg = "Length of data in %s is too long." % self.__class__.__name__
          log.error(msg, extra=extra)
docs: Helper function for logging a response length error.