Comment 2 for bug 1866824

@rharding Hi, so, this is sth that we are seeing customers request at design on top of OpenStack: add all nodes to a single region and set up Host Aggregates which will separate hosts by functions.

The problem is that tenants won't know about that. For that, they need to have a way to request VMs and always get them to the right hosts (e.g. dev team, goes to dev hosts).

That link between cloud administration and users is flavors.
That is why it is important to get it right on Juju as well. Juju needs to be able to deploy from its tenant into other tenants, which may have private flavors only for them.