proberk runs in kubernetes and there is no HTML frontend. The prober configuration is baked into the Docker container - in order to update that, one must rebuild and re-deploy the container.
This alert means that one of the ResponseTesters is not happy with the result. The prober name should be in the alert message and can help explain more precisely what is going wrong. In all cases, looking at the logs from kubernetes can be helpful in learning more. The alert message should have a search link to help identify the file which defines the prober.
This ProberFailure type means that the current list of public repos visible at https://skia.googlesource.com/?format=JSON does not match the baked in version. This could mean we accidentally leaked something private, but more often simply means we just added a GoB mirror (e.g. go/new-skia-git-mirror).
To address this, run ./generate.sh from the //prober/expectations directory in the k8s-config repo. Verify the diffs and check them in. The changes will autodeploy.