It seems the poller is only able to check the node-label. Often the label !=
For example we use the label to have a more understandable name and the node name is just the hostname.
hostname1 - srv-ads
hostname2 - srv-onms
hostname3 - srv-printserver
Sure, you could use these labels also as nodenames in general
But it makes also sense to be able to choose which name the DnsResolutionMonitor should check.