private List<UpstreamInstance> getAllClusterLastUpdateInstanceList() {
        List<String> pluginNames = RpcTypeEnum.acquireSupportSwaggers().stream()
                .map(rpcTypeEnum -> PluginNameAdapter.rpcTypeAdapter(rpcTypeEnum.getName()))
                .collect(Collectors.toList());
        final List<PluginDO> pluginDOList = pluginMapper.selectByNames(pluginNames);
        if (CollectionUtils.isEmpty(pluginDOList)) {
            return Collections.emptyList();
        }
        supportSwaggerPluginSet = new HashSet<>(pluginNames);
        List<String> pluginIds = pluginDOList.stream().map(PluginDO::getId).collect(Collectors.toList());
        CommonPager<SelectorVO> commonPager = selectorService.listByPage(new SelectorQuery(pluginIds, null, new PageParameter(1, Integer.MAX_VALUE), SYS_DEFAULT_NAMESPACE_ID));
        List<SelectorVO> clusterList = commonPager.getDataList();
        if (CollectionUtils.isEmpty(clusterList)) {
            LOG.info("getAllClusterLastUpdateInstanceList. Not loaded into available backend services.");
            return Collections.emptyList();
        }
        return clusterList.parallelStream()
                .map(this::getClusterLastUpdateInstance)
                .filter(Objects::nonNull)
                .collect(Collectors.toList());
    }
Get the last started healthy instance of each cluster.

@return List
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/manager/impl/LoadServiceDocEntryImpl.java