Not sure if this is what you're talking about, but for general Kubernetes EOL you can find them posted at https://kubernetes.io/releases/ and look at past RKE2 releases patterns?
rapid-helmet-86074
07/05/2022, 4:09 PM
Note that RKE2 bundles the nginx ingress controller & CNIs, so I think I've seen a past EOL release for a Kubernetes version just to do some of those sorts of updates.