docs: public static void main(String... args) throws Exception {
      ClientConfiguration.Builder configBuilder = ClientConfiguration.newBuilder(
          ADDRESS, TARGET_QPS, CLIENT_PAYLOAD, SERVER_PAYLOAD, TLS,
          TESTCA, TRANSPORT, DURATION, SAVE_HISTOGRAM, FLOW_CONTROL_WINDOW);
      ClientConfiguration config;
      try {
        config = configBuilder.build(args);
      } catch (Exception e) {
        System.out.println(e.getMessage());
        configBuilder.printUsage();
        return;
      }
      OpenLoopClient client = new OpenLoopClient(config);
      client.run();
    }