The Cluster IP of the prometheus-node-state-metrics service is None.
$ kubectl get svc -n tanzu-system-monitoring
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
alertmanager ClusterIP 10.96.nnn.www <none> 80/TCP XXXd
prometheus-kube-state-metrics ClusterIP None <none> 80/TCP,81/TCP XXXd
prometheus-node-exporter ClusterIP 10.96.mmm.xxx <none> 9100/TCP XXXd
prometheus-pushgateway ClusterIP 10.96.ooo.yyy <none> 9091/TCP XXXd
prometheus-server ClusterIP 10.96.ppp.zzz <none> 80/TCP XXXd
This is expected behavior and does not indicate a problem.