For procedure documentation I often use ${service_namr:?} For similar reasons. If the variable isn't set you get a clear error. And it provides an easy way to u

For procedure documentation I often use ${service_namr:?} For similar reasons. If the variable isn't set you get a clear error. And it provides an easy way to use the template without modification. It isn't perfect, common variable names may already be set or have been set in a previous execution of this playbook on a different problem. But it catches common issues while being convenient.