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I'm not sure who in there right mind would use Fedora rawhide in a Kubernetes cluster. That's just insane.
Developers wanting to test the upcoming release and get a head start in their lab so they can be prepared when the "stable" RHEL or compatible distro releases this. I doubt any are deploying k8s to prod on fedora
RedHat CoreOS derives from Fedora which is the underlying OS of OpenShift - so this is really interesting because it is not like in the old days „this is a problem for future me when RHEL 15 drops in 10 years“. They are quite pushing hard with CoreOS, at least in OKD which uses Fedora CoreOS.