@Override
    public String toString() {
        return "ConfigChangeWatcher{" + "module=" + module + ", provider=" + provider + ", itemName='" + itemName + '\'' + '}';
    }
@return current value of current config.
oap-server/server-configuration/configuration-api/src/main/java/org/apache/skywalking/oap/server/configuration/api/ConfigChangeWatcher.java