public void updateZoneServerMapping(Map<String, List<Server>> map) {
        upServerListZoneMap = new ConcurrentHashMap<String, List<? extends Server>>(map);
        // make sure ZoneStats object exist for available zones for monitoring purpose
        for (String zone: map.keySet()) {
            getZoneStats(zone);
        }
    }
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