def generate_product_instance_id(vm_fqn, product_name, product_version):
    """
    Method to generate instance id for installed products (product instances)
    :param vm_fqn: FQN (where product has been installed)
    :param product_name: Product name (instance)
    :param product_version: Product release (instance)
    :return: Product instance ID
    """
    return "{}_{}_{}".format(vm_fqn, product_name, product_version)