How to figure out what causes WorkhorseHighErrorRate


Since a few days I have enabled email from the alert manager. I have a self-hosted instance of GitLab.

It gives regular alerts about high error rates. Something like this.

[1] Firing
alertname = WorkhorseHighErrorRate
method = get
route = ^/uploads/
description = Workhorse route ^/uploads/ method get has more than 50% errors (100.0%) for the last 60 minutes.
summary = Workhorse has high error rates

Where should I look to see what errors they are?

BTW there is a link in the same email that points to port 9090 of my GitLab server. However, that port is just bound to localhost, so I can’t see what’s on it. The port is served by prometheus.