We need a documentation item which describes how CNV behaves with oc adm drain (kubectl drain).

The problem is as follows:
Today CNV (kubevirt) can not reliably identify node drains if they are triggered through a call of "oc adm drain" (or "kubectl drain").
If these commands are called on a node of a cluster with CNV deployed, then those nodes might not go to maintenance if there are VMs running on top of that node.

Workaround:
The current solution is to use the Node Maintenance Operator for putting nodes into maintenance.