As an example, you can check our reference implementation of the template for AWS LoadBalancer resource
https://github.com/openstack/heat/blob/master/heat/engine/resources/aws/lb/loadbalancer.py#L161
As an example, you can check our reference implementation of the template for AWS LoadBalancer resource
https:/ /github. com/openstack/ heat/blob/ master/ heat/engine/ resources/ aws/lb/ loadbalancer. py#L161