We are using it in the graphs https://grafana-rw.wmcloud.org/d/m9V1RQs4k/harbor-overview?orgId=1

But for the alerts we are just using the pingthing, that only checks for the main UI page (login page), that was up and running, so it did not notice the core service being down: https://gitlab.wikimedia.org/repos/cloud/toolforge/alerts/-/blob/main/buildservice/harbor.yaml?ref_type=heads