@Override
    public void addServers(List<Server> newServers) {
        if (newServers != null && newServers.size() > 0) {
            try {
                ArrayList<Server> newList = new ArrayList<Server>();
                newList.addAll(allServerList);
                newList.addAll(newServers);
                setServersList(newList);
            } catch (Exception e) {
                logger.error("LoadBalancer [{}]: Exception while adding Servers", name, e);
            }
        }
    }
Add a list of servers to the 'allServer' list; does not verify
uniqueness, so you could give a server a greater share by adding it more
than once
ribbon-loadbalancer/src/main/java/com/netflix/loadbalancer/BaseLoadBalancer.java