@Override
    public String toString(){
        StringBuilder sb = new StringBuilder();        
        sb.append("[Zone:" + zone + ";");
        sb.append("\tInstance count:" + getInstanceCount() + ";");
        sb.append("\tActive connections count: " + getActiveRequestsCount() + ";");
        sb.append("\tCircuit breaker tripped count: " + getCircuitBreakerTrippedCount() + ";");
        sb.append("\tActive connections per server: " + getActiveRequestsPerServer() + ";");        
        sb.append("]\n");        
        return sb.toString();
    }
Class that stores Statistics per Zone (where Zone is typically a Amazon
Availability Zone)

@author awang

@param <T>
ribbon-loadbalancer/src/main/java/com/netflix/loadbalancer/ZoneStats.java