I have prometheus deployed in my cluster within my custom namespace and prometheus adapter deployed within the same cluster and within the same namespace:

But when I execute:

$ kubectl get --raw /apis/custom.metrics.k8s.io/v1beta1

I see empty response:

{"kind":"APIResourceList","apiVersion":"v1","groupVersion":"custom.metrics.k8s.io/v1beta1","resources":[]}

Although prometheus contains metrics:

I configured prometheus url inside prometheus adapter YML:

How to fix it ?