public void incrementZoneCounter(Server server) {
        String zone = server.getZone();
        if (zone != null) {
            getZoneStats(zone).incrementCounter();
        }
    }
Method that updates the internal stats of Response times maintained on a per Server
basis
@param server
@param msecs
ribbon-loadbalancer/src/main/java/com/netflix/loadbalancer/LoadBalancerStats.java