apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/InstanceService.java/InstanceService/batchDeleteInstanceConfig
class InstanceService:  @Transactional
  public int batchDeleteInstanceConfig(String configAppId, String configClusterName, String configNamespaceName){
    return instanceConfigRepository.batchDelete(configAppId, configClusterName, configNamespaceName);
  }