apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/api/AdminServiceAPI.java/ItemAPI/findDeletedItems
class ItemAPI:    public List<ItemDTO> findDeletedItems(String appId, Env env, String clusterName, String namespaceName) {
      ItemDTO[] itemDTOs =
          restTemplate.get(env, "apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/items/deleted",
              ItemDTO[].class, appId, clusterName, namespaceName);
      return Arrays.asList(itemDTOs);
    }