code: public void record(long measurement) {
      lastUsed = clock.now();
      if (isExpired()) {
        LOGGER.info("Attempting to get the value for an expired monitor: {}."
                + "Will start computing stats again.",
            getConfig().getName());
        startComputingStats(executor, statsConfig.getFrequencyMillis());
      }
  
      synchronized (updateLock) {
        cur.record(measurement);
      }
      count.increment();
      totalMeasurement.increment(measurement);
    }
docs: Record the measurement we want to perform statistics on.