@TheFrostKing Hi and welcome to the Forum 
AFAIK the latest supported k3s in Rancher is 1.27.13+k3s1 or 1.28.9+k3s1(experimental), so the monitoring won’t be available…
Ref: https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/rancher-v2-8-3/