public static long getLeastWindowCount(String appName) {
        FaultToleranceConfig config = getConfig(appName);
        return config.getLeastWindowCount();
    }
Gets least window count.

@param appName the app name
@return the least window count
fault/fault-tolerance/src/main/java/com/alipay/sofa/rpc/client/aft/FaultToleranceConfigManager.java