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it seems k3s refuses to remove it as to not loose quorum.

Jul 11 09:59:37 rnwtrk-k3s-m0 k3s[2066306]: time="2023-07-11T09:59:37Z" level=info msg="Removing etcd member rnwtrk-k3s-m0 from cluster"
Jul 11 09:59:37 rnwtrk-k3s-m0 k3s[2066306]: time="2023-07-11T09:59:37Z" level=info msg="Removing name=rnwtrk-k3s-m0-e3fa5e3e id=5356149094277213396 address=100.65.172.11 from etcd"
Jul 11 09:59:37 rnwtrk-k3s-m0 k3s[2066306]: {"level":"warn","ts":"2023-07-11T09:59:37.323Z","caller":"membership/cluster.go:657","msg":"rejecting member remove; started member will be less than quorum","number-of-started-member":0,"quorum":1,"cluster-id":"3b4c4caef42b6889","local-member-id":"4a54dd39206c6cd4"}
Jul 11 09:59:37 rnwtrk-k3s-m0 k3s[2066306]: {"level":"warn","ts":"2023-07-11T09:59:37.324Z","caller":"etcdserver/server.go:1800","msg":"rejecting member remove request; not enough healthy members","local-member-id":"4a54dd39206c6cd4","requested-member-remove-id":"4a54dd39206c6cd4","error":"etcdserver: re-configuration failed due to not enough started members"}
Jul 11 09:59:37 rnwtrk-k3s-m0 k3s[2066306]: I0711 09:59:37.324856 2066306 event.go:294] "Event occurred" object="kube-system/metrics-server-service" fieldPath="" kind="Addon" apiVersion="<http://k3s.cattle.io/v1|k3s.cattle.io/v1>" type="Normal" reason="ApplyingManifest" message="Applying manifest at \"/var/lib/rancher/k3s/server/manifests/metrics-server/metrics-server-service.yaml\""
Jul 11 09:59:37 rnwtrk-k3s-m0 k3s[2066306]: {"level":"warn","ts":"2023-07-11T09:59:37.334Z","logger":"etcd-client","caller":"v3@v3.5.7-k3s1/retry_interceptor.go:62","msg":"retrying of unary invoker failed","target":"<etcd-endpoints://0xc000c4d880/127.0.0.1:2379>","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}

So perhaps I can fix this by adding a new node?