docs: def log_message(self, format, *args):
          """Logs a message. All messages get prefixed with '[SERVER]'
             and the arguments act like `format`.
          """
          clock_start = getattr(thread_local, 'clock_start', None)
          thread_local.clock_start = None
          timing = self.log_elapsed_time_string(
              get_time() - clock_start) if clock_start is not None else ''
          msg("%s[%s] %s" % (
              timing + ' ' if len(timing) else '', self.log_date_time_string(),
              format % args))