docs: def emit(self, record):
          """Write record as journal event.
  
          MESSAGE is taken from the message provided by the
          user, and PRIORITY, LOGGER, THREAD_NAME,
          CODE_{FILE,LINE,FUNC} fields are appended
          automatically. In addition, record.MESSAGE_ID will be
          used if present.
          """
          if record.args and isinstance(record.args, collections.Mapping):
              extra = dict(self._extra, **record.args)  # Merge metadata from handler and record
          else:
              extra = self._extra
          try:
              msg = self.format(record)
              pri = self.mapPriority(record.levelno)
              mid = getattr(record, 'MESSAGE_ID', None)
              send(msg,
                   SOCKET=self.socket,
                   MESSAGE_ID=mid,
                   PRIORITY=format(pri),
                   LOGGER=record.name,
                   THREAD_NAME=record.threadName,
                   CODE_FILE=record.pathname,
                   CODE_LINE=record.lineno,
                   CODE_FUNC=record.funcName,
                   **extra)
          except Exception:
              self.handleError(record)