Add metric to project on group-level cluster


I’m having problems adding a custom metric to an project that is deployed via auto devops to a group-level cluster.

Prometheus is installed and fetching the default metrics works like a charm. But when I add a metric I’m redirected to the integration settings page of prometheus which states that prometheus is not activated. Although I see a blue notification which states “metric successfuly added”.

Can someone explain how I can obtain custom metrics on such an setup?