Section Number and Name:
Specifying Metrics Ansible Variables
Describe the issue:
The document doesn't have information about the default value when users don't specify `openshift_metrics_cassandra_nodeselector` / `openshift_metrics_hawkular_nodeselector ` / `openshift_metrics_heapster_nodeselector `.
If users don't have any specific value in their inventory, the nodeselector becomes blank value("") like this:
$ oc get project openshift-infra -o yaml
It means that the pods in openshift-infra ignore defaultNodeSelector and may be deployed to any kind of node.
I think the behavior is confusing and should be documented.
Suggestions for improvement:
The documentation about the default behavior can be added to improvement.