docs: def _on_5xx_error(batch, error, database, measurements):
      """Handle a batch submission error, logging the problem and adding the
      measurements back to the stack.
  
      :param str batch: The batch ID
      :param mixed error: The error that was returned
      :param str database: The database the submission failed for
      :param list measurements: The measurements to add back to the stack
  
      """
      LOGGER.info('Appending %s measurements to stack due to batch %s %r',
                  database, batch, error)
      _measurements[database] = _measurements[database] + measurements