There are a set of Grafana dashboards and Prometheus alerts available on the Vitess tree in GitHub. For more context on these dashboards please refer to the original pull request.
...moreIf you would like to differentiate metrics for a 'bad_user@their_machine' from a 'good_user@their_machine', rather than having both users appear to be the same user from the same server to MySQL you will need to use table ACLs.
Vitess exports per-user
...more