Issue: Resources and Pod count gets doubled in OpenShift WebConsole when _replica_ is set to $(POD_NAME) and added as external label in cluster-monitoring-config cm.

Steps to reproduce:

1) OpenShift WebConsole > Compute > Nodes (Take screenshot)

2) Create cluster-monitoring-config cm in openshift-monitoring 

apiVersion: v1
kind: ConfigMap
metadata:
  name: cluster-monitoring-config
  namespace: openshift-monitoring
data:
  config.yaml: |
    prometheusK8s:
      externalLabels:
         __replica__: $(POD_NAME) 

https://docs.openshift.com/container-platform/4.10/monitoring/configuring-the-monitoring-stack.html#attaching-additional-labels-to-your-time-series-and-alerts_configuring-the-monitoring-stack

 3) OpenShift WebConsole > Compute > Nodes ---> check pod count and resources --> 2x values are found

4) With API 2x values are not seen

oc -n openshift-monitoring exec -c prometheus prometheus-k8s-0 -- curl -s --data-urlencode "query=sum by (instance) (node_memory_MemTotal_bytes)" 'http://localhost:9090/api/v1/query?'  

More info:

Git link : https://github.com/openshift/console/blob/4c6249f47bc61c8b8e5dfc52a555dc108a9ed079/frontend/packages/console-app/src/components/nodes/NodesPage.tsx#L416-L447