I have searched for an answer to the question off and on for a couple of years on these forums with no straight answer. You can find posts with these requests going back to 2012...
I want a simple method to monitor "agent unreachable" machines (as displayed in the Horizon web interface) using VMware View PowerCLI, a value in the ADAM database, or a value in the SQL Database. There is no easy, supported method for this request in over 5 years. Will VMware ever answer view admin's prayers and add support for this? How difficult can this really be to implement? So frustrating...
See:
VMware View display desktop status information
How to get View pool desktop status