@VisibleForTesting
    NamedCountingMonitor getProtocolMonitor(String proto) {
        return this.protocolCounterMap.get(protocolKey(proto));
    }
@param route
@param statusCode
@return the RouteStatusCodeMonitor for the given route and status code
zuul-core/src/main/java/com/netflix/zuul/stats/StatsManager.java