$ KUBECONFIG=kubeconfig kubectl --server=http://localhost:8080/clusters/cluster1 get node
NAME STATUS ROLES AGE VERSION
cluster1-control-plane Ready control-plane 11d v1.24.0
$ KUBECONFIG=kubeconfig kubectl --server=http://localhost:8080/clusters/cluster2 get node
NAME STATUS ROLES AGE VERSION
cluster2-control-plane Ready control-plane 11d v1.24.0