externalMetrics.yaml

apiVersion: apiregistration.k8s.io/v1beta1
kind: APIService
metadata:
  name: v1beta1.external.metrics.k8s.io
spec:
  service:
    name: ponderous-catfish-prometheus-adapter
    namespace: monitoring
  group: external.metrics.k8s.io
  version: v1beta1
  insecureSkipTLSVerify: true
  groupPriorityMinimum: 100
  versionPriority: 100

shell output

vagrant@k8s-01:~$ kubectl get service -n monitoring
NAME                                   TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
ponderous-catfish-prometheus-adapter   ClusterIP   10.233.4.71    <none>        443/TCP    4d
vagrant@k8s-01:~$ kubectl get --raw "/apis/external.metrics.k8s.io/" | jq
{
  "kind": "APIGroup",
  "apiVersion": "v1",
  "name": "external.metrics.k8s.io",
  "versions": [
    {
      "groupVersion": "external.metrics.k8s.io/v1beta1",
      "version": "v1beta1"
    }
  ],
  "preferredVersion": {
    "groupVersion": "external.metrics.k8s.io/v1beta1",
    "version": "v1beta1"
  }
}
vagrant@k8s-01:~$ kubectl get --raw "/apis/external.metrics.k8s.io/v1beta1" | jq .
Error from server (NotFound): the server could not find the requested resource