A new service endpoint ID discovery feature has been released in oslo.limit 2.6.0 (Epoxy):

https://github.com/openstack/oslo.limit/commit/9575a24796e019fd66f1bb1a5ef0bcbfc167351a

which requires only the service name and type. There is an open bug for consuming it in Nova:

https://bugs.launchpad.net/nova/+bug/1931875

and once done, there will be no need to have the `[oslo_limit]endpoint_id` hard-coded into the config and we could remove any one-off config update in the installer for the Nova API endpoint ID.

It is unclear if/how we could incorporate this into 18.0 given the requirement of a new oslo.limit library version but if there is a way we could, it would simplify the installer config process for unified limits.