private CloseRequestB2M createMasterCloseRequest() {
        CloseRequestB2M.Builder builder = CloseRequestB2M.newBuilder();
        builder.setBrokerId(String.valueOf(tubeConfig.getBrokerId()));
        ClientMaster.MasterCertificateInfo.Builder authInfoBuilder = genMasterCertificateInfo();
        if (authInfoBuilder != null) {
            builder.setAuthInfo(authInfoBuilder.build());
        }
        return builder.build();
    }
Build close request to master.

@return the CloseRequestB2M request object
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/broker/TubeBroker.java