Currently, the prometheus' node-exporter has an hard-coded command line argument for excluded net devices: https://github.com/openshift/cluster-monitoring-operator/blob/d1179dcd3090bc31e3de08259c0c792a1f3a0061/assets/node-exporter/daemonset.yaml#LL40C11-L40C144

This pull-request https://github.com/openshift/cluster-monitoring-operator/pull/1888 added some configurability (the netdev module can be switched on/off) - as a follow-up we'd like to go a step further and make the whole exclusion list configurable.

Need to agree & coordinate with the monitoring team about the work to do - at a first glance, it should be quite similar to the PR mentioned above.

We'd like to be able to configure as such (via the cluster-monitoring-config configmap) :

apiVersion: v1
kind: ConfigMap
metadata:
  name: cluster-monitoring-config
  namespace: openshift-monitoring
data:
  config.yaml: |
    nodeExporter:
      collectors:
        netdev:
          enabled: true
          ignoredDevices:
          - br-.+
          - veth.*