private void removeListener(final String removeKey) {
        LOG.info("AbstractNodeDataSyncService sync remove listener key:{}", removeKey);
        doRemoveListener(removeKey);
    }
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