Who upgrades Kubernetes on my Hosted Rancher downstream clusters?
Customers are responsible for upgrading all downstream clusters that Hosted Rancher manages. RKE (custom) clusters can be easily upgraded and rolled back by using the UI or API. See (Rancher docs)[https://rancher.com/docs/rancher/v2.x/en/cluster-admin/upgrading-kubernetes/] for more details. Imported K3s clusters can also be easily upgraded in the UI.