We have a customer with a small configuration: A single high-performance HPCC node that we configured with four virtual Thor slaves. After restarting HPCC the challenge became confirming the configuration change and that the four virtual slaves were actually running.
Drilling into Operations -> Cluster Processes -> mythor showed only a single Thor slave node. Inspecting Topology and other items with the Operations tab showed only a single Thor slave node. The only place where we could find a hint that the virtual slaves were active was in the Thor slave log files, where the slave process started up.
The process for determining the status of Thor virtual slaves should be the same as with regular slaves. Granted, the displayed information may be different, but how that status is found should be the same.