for key, value in six.iteritems(record.__dict__):
            if key in ('args', 'asctime', 'bracketlevel', 'bracketname', 'bracketprocess',
                       'created', 'exc_info', 'exc_text', 'id', 'levelname', 'levelno', 'msecs',
                       'msecs', 'message', 'msg', 'relativeCreated', 'version'):
                # These are already handled above or explicitly pruned.