public void incrementActiveRequestsCount() {        
        activeRequestsCount.incrementAndGet();
        requestCountInWindow.increment();
        long currentTime = System.currentTimeMillis();
        lastActiveRequestsCountChangeTimestamp = currentTime;
        lastAccessedTimestamp = currentTime;
        if (firstConnectionTimestamp == 0) {
            firstConnectionTimestamp = currentTime;
        }
    }
Call this method to note the response time after every request
@param msecs
ribbon-loadbalancer/src/main/java/com/netflix/loadbalancer/ServerStats.java