This epic is about supporting unified limits in OSP18.

• backport the Epoxy changes to Antelope downstream
• finish the discussion from https://issues.redhat.com/browse/OSPRH-150?focusedId=25256435&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-25256435 about how to automate
  • the greenfield enablement of unified limits (e.g. what will be our defaults and how the human specifies them)
  • the adoption from 17.1 to 18.0.x and transform the legacy limits to unified limits
  • the upgrade from 18.0.[0-3?] to 18.0.x and transform the legacy limits to unified limits
• QE all the above implementation
• Document all the above

We will need to create stories accordingly.

==

Old description :

We need a procedure that:

• changes nova's quota driver via the OpenStackControlPlane CR
  • which services needs the drive config? api, conductor, scheduler or we need to config compute too?
• describe how to manually define default limits for greenfield
• describe how to manually migrate existing quota config for adoption
  • or backport the nova-manage limit command to Antelope from Bobcat
  • or state that unified limits only supposed to be enabled on greenfield as day one operation
• describe that no defined limit means 0 quota for that resource

https://docs.openstack.org/nova/latest/admin/unified-limits.html
https://docs.openstack.org/nova/latest/cli/nova-manage.html#limits-migrate-to-unified-limits