More of a question than a problem. Is adding the subscription-manager package to Oracle Linux required for Katello? Or is there a method around this? Most of the information I found involved installing subscription-manager from centos repos.
If you want your Oracle host to register with Katello (which is needed for 90% of Katello’s features), then you need to install subscription-manager on it. And yes, subscription-manager is not present in the Oracle Linux repos, but using the subscription-manager for some other EL8 variant on Oracle is generally known to work.
I also listed some packages that should probably be filtered out since Oracle packages things in such a way that their packages obsolete subscription manager (this was a huge pain in Oracle Linux 7 and I just kept doing it for Oracle Linux 8). I do not have a URL yet for Oracle Linux 9, but hopefully the individuals that package subscription-manager into these repositories take pity on us and do so for EL9.