docs: public ValueVo getConfItemByParameter(Long appId, Long envId, String version, String key) {
  
          Config config = configDao.getByParameter(appId, envId, version, key, DisConfigTypeEnum.ITEM);
          if (config == null) {
              return ConfigUtils.getErrorVo("cannot find this config");
          }
  
          ValueVo valueVo = new ValueVo();
          valueVo.setValue(config.getValue());
          valueVo.setStatus(Constants.OK);
  
          return valueVo;
      }