Description of problem:
node_exporter that can't be running on nodes that are offline/unavailable is one of the top reasons why CMO goes degraded. It would make sense to have CMO correlate the number of running node_exporter pods with the status of the nodes and not go degraded if the node_exporter pods are running on all nodes which are ready. As an example, if the cluster has N nodes with one node being not ready and (N-1) node_exporter pods are running then CMO should report Available rather than Degraded.

Version-Release number of selected component (if applicable):

How reproducible:
Always when nodes are offline.

Steps to Reproduce:
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Actual results:

Expected results:

Additional info:

Backport clone of https://issues.redhat.com/browse/OCPBUGSM-32497