code: public synchronized void addMicro(long micros) {
  		total.addAndGet(micros);
  
  		if (count.incrementAndGet() == 1) {
  			min.set(micros);
  			max.set(micros);
  		} else {
  			if (micros < min.get()) {
  				min.set(micros);
  			}
  			if (micros > max.get()) {
  				max.set(micros);
  			}
  		}
  	}
docs: Adds interval given in microseconds *