apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/api/AdminServiceAPI.java/InstanceAPI/getByRelease
class InstanceAPI:    public PageDTO<InstanceDTO> getByRelease(Env env, long releaseId, int page, int size) {
      ResponseEntity<PageDTO<InstanceDTO>>
          entity =
          restTemplate
              .get(env, "/instances/by-release?releaseId={releaseId}&page={page}&size={size}", pageInstanceDtoType,
                  releaseId, page, size);
      return entity.getBody();

    }