[ovirt-users]oVirt 4.5.7 self-hosted Engine EL8 to EL9 upgrade

Hi, I'm running OLVM/oVirt 4.5.7 with a self-hosted Engine on Oracle Linux 8 and need to move the Engine to Oracle Linux 9. Oracle currently publishes an EL8 to EL9 upgrade procedure for a standalone Engine, but I haven't been able to find an equivalent procedure for a self-hosted Engine. I'm assuming an in-place OS upgrade isn't the recommended approach. What is the correct procedure for an existing self-hosted Engine? Is there an upstream oVirt guide covering an EL8 to EL9 migration, and has anyone successfully performed this with 4.5.7? Thanks, Klokanovic