private String getConfigOnWatch(final String key, final Consumer<String> updateHandler, final Consumer<String> deleteHandler) {
        return getServiceConfig(key, updateHandler, deleteHandler);
    }
AbstractNodeDataSyncService.
Abstract method to monitor child node changes.
shenyu-sync-data-center/shenyu-sync-data-api/src/main/java/org/apache/shenyu/sync/data/core/AbstractNodeDataSyncService.java