I’m running checkmk 2.0.0 on an AlmaLinux 8.5 server. No problems at all.
Migrated from a CentOS 7 box by sshing from the new host to the old:
ssh root@oldhost “omd backup sitename -” | omd restore -
It was surprisingly painless.
If you’re running on CentOS 8 or 8-stream, migration to AlmaLinux is easy - just use almalinux-deploy.sh (my version in GitHub - philrandal/almalinux-deploy: EL to AlmaLinux migration tool. handles CentOS Stream 8 to AlmaLinux 8 conversion).