$ oc --kubeconfig /tmp/ota-stage.c get ep -n openshift-etcd etcd -o yaml
apiVersion: v1
kind: Endpoints
metadata:
  annotations:
    endpoints.kubernetes.io/last-change-trigger-time: "2025-05-27T14:34:54Z"
  creationTimestamp: "2021-09-13T16:32:57Z"
  labels:
    k8s-app: etcd
  name: etcd
  namespace: openshift-etcd
  resourceVersion: "2744074947"
  uid: 47ac900e-8947-467a-a2cf-24917e732865
subsets:
- addresses:
  - ip: 10.0.151.192
    nodeName: ip-10-0-151-192.ec2.internal
    targetRef:
      kind: Pod
      name: etcd-ip-10-0-151-192.ec2.internal
      namespace: openshift-etcd
      uid: e4dfc07b-a13a-44be-9fe7-573a9a459a00
  - ip: 10.0.155.231
    nodeName: ip-10-0-155-231.ec2.internal
    targetRef:
      kind: Pod
      name: etcd-ip-10-0-155-231.ec2.internal
      namespace: openshift-etcd
      uid: d311facb-b4c6-427a-9074-f12dd8439615
  - ip: 10.0.233.38
    nodeName: ip-10-0-233-38.ec2.internal
    targetRef:
      kind: Pod
      name: etcd-ip-10-0-233-38.ec2.internal
      namespace: openshift-etcd
      uid: 8f11696a-0005-4521-962a-6469f8e183fc
  ports:
  - name: etcd
    port: 2379
    protocol: TCP
  - name: etcd-metrics
    port: 9979
    protocol: TCP

$ oc --kubeconfig /tmp/ota-stage.c  -n hongkliu-test run -i -t debug --image=quay.io/centos/centos:stream9 --restart=Never --rm=true
If you don't see a command prompt, try pressing enter.
bash-5.1# curl -k https://10.0.151.192:9979/metrics
curl: (56) OpenSSL SSL_read: error:0A00045C:SSL routines::tlsv13 alert certificate required, errno 0
bash-5.1# echo $?
56

$ oc --kubeconfig /tmp/ota-stage.c get clusterversion NAME      VERSION   AVAILABLE   PROGRESSING   SINCE   STATUS version   4.18.15   True        False         73d     Cluster version is 4.18.15 

always

1. see descriptions

curl failed with exit code 56

curl succeeds with http status code 401