code: public EtcdStoreStatsResponse getStoreStats() {
      try {
        return new EtcdStoreStatsRequest(this.client, retryHandler).send().get();
      } catch (IOException | EtcdException | EtcdAuthenticationException | TimeoutException e) {
        return null;
      }
    }
docs: Get the Store Statistics of Etcd
  
  @return vEtcdStoreStatsResponse