docs: def _log(self, level, msg, args, kwargs):
          """Throttled log output."""
  
          with self._tb_lock:
              if self._tb is None:
                  throttled = 0
                  should_log = True
              else:
                  throttled = self._tb.throttle_count
                  should_log = self._tb.check_and_consume()
  
          if should_log:
              if throttled > 0:
                  self._logger.log(level, "")
                  self._logger.log(
                      level,
                      "(... throttled %d messages ...)",
                      throttled,
                  )
                  self._logger.log(level, "")
  
              if msg is not None:
                  self._logger.log(level, msg, *args, **kwargs)
  
              return FancyLogContext(self._logger,
                                     level,
                                     self._verbosity,
                                     self._structured_detail,
                                     self._with_prefix)
          else:
              return NoopLogContext()