private String buildInstanceNodeName(final InstanceEntity instance) {
        String host = instance.getHost();
        int port = instance.getPort();
        return String.join(Constants.COLONS, host, Integer.toString(port));
    }
The type apollo instance register repository.
shenyu-registry/shenyu-registry-apollo/src/main/java/org/apache/shenyu/registry/apollo/ApolloInstanceRegisterRepository.java