def record(self, value=1.0, time_ms=None):
        """
        Record a value at a known time.
        Arguments:
            value (double): The value we are recording
            time_ms (int): A POSIX timestamp in milliseconds.
                Default: The time when record() is evaluated (now)

        Raises:
            QuotaViolationException: if recording this value moves a
                metric beyond its configured maximum or minimum bound
        """
        if time_ms is None:
            time_ms = time.time() * 1000
        self._last_record_time = time_ms
        with self._lock:  # XXX high volume, might be performance issue
            # increment all the stats
            for stat in self._stats:
                stat.record(self._config, value, time_ms)
            self._check_quotas(time_ms)
        for parent in self._parents:
            parent.record(value, time_ms)