Linkerd clusterNetworks for ExternalName service

[seagullua]

When I run linkerd check --proxy I get the next error:

 cluster networks contains all services
    the Linkerd clusterNetworks ["10.0.0.0/8,100.64.0.0/10,172.16.0.0/12,192.168.0.0/16"] do not include svc my-namespace/postgres-database ()
    see https://linkerd.io/2.12/checks/#l5d-cluster-networks-pods for hints

The service in question has type type: ExternalName and should not be monitored by linkerd.

The official docs https://linkerd.io/2.12/checks/#l5d-cluster-networks-pods are not very helpful. To remedy this, update the clusterNetworks setting. However, I did not find any information how clusterNetworks can be configured in Linkerd

This error appeared after the upgrade to Linkerd 2.12

[seagullua]

It was answered here #9814