Currently, there is a manual step required when configuring unified limits on 18.0 to set the endpoint ID in the nova.conf for nova-api and nova-conductor services, for example:

[oslo_limit]
endpoint_id = <Nova API endpoint ID>

This is documented in:

https://docs.redhat.com/en/documentation/red_hat_openstack_services_on_openshift/18.0/html/configuring_the_compute_service_for_instance_creation/assembly_configuring-unified-limits_scheduling-and-placement#proc_enabling-unified-limits_scheduling-and-placement

With this change (oslo.limit endpoint discovery), it is no longer necessary to do the manual configuration step.

One way to verify this would be to remove the Nova endpoint_id related code from:

https://gitlab.cee.redhat.com/ci-framework/ci-framework-jobs/-/blob/main/playbooks/podified/hooks/nova-unified-limits-enable.yaml

and verify the CI job still passes.