https://support.ca.com/phpdocs/7/8530/8530_CloudMonitor_roadmap.pdf
On-Premise Monitoring Stations
Under Consideration in multiple release
Unified User Monitoring: Synthetic-To-Real Transaction Integration for External & On-Premise Monitoring
From what I can gather, the On-Premise Monitoring Station is the Point-of-Presence that basically acts like a single communication bridge through your firewalled intranet to then communicate with the Cloud service through the internet.
The On-Premise Monitoring, haven't found anything describing it but guessing it is where the data and scripts are kept on the intranet and no communication with the Cloud service. This feature is "under consideration" and I am going to go look for an "Ideas" entry for this.
Billy