We learned recently that OPMS is compatible with RHEL 8 . When did support first start?
The "April 2023.3" release is the first to support RHEL8. Please see the Release Notesl it says "New OPMS installer for docker containers and the docker-compose file." under the Monitoring Stations enhancements . So it is implied.
It does not mention RHEL 8 support specifically because the new installer (and OPMS as a whole) will run on any system that supports docker and docker-compose.