<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _warning(self, msg, duration=None, results=None):
 """Log warnings."""

        logger.warning(
            "{} ({})".format(msg, self._get_logging_id()),
            extra=self._get_logging_extra(duration=duration, results=results),
        )