Using #Terraform, it can be convenient to deploy a set of equivalent #stateful resources, e.g. #VirtualMachines, by using the `for_each` meta-argument. I.e., where
* the map fed to for_each refers to a common configuration shared by all VMs.
* e.g. the content on the root volume of the #VM is the #state.

But how to manage deploying updates the shared config for a sub-set of such a #stateful set, e.g. for #IncrementalDeployment?

If the common config changes, the default is to re-create all VMs.