There is no "monitoring" in the sense that you mean it. Everything is event driven. HSM is waiting for events from devices. If a device being used drops off line, is stolen, has its battery die, gets zapped by lightning, etc. HSM has no way to know that happened. That device simply no longer sends any events.
Device Health is a chimera. It is only as good as the devices involved, and in general most of these consumer devices are not of high enough quality to support true device health. The downside of pretending to have device health is that it leads to a false sense of security that doesn't actually exist. We've had lengthy internal discussions about this issue for years. We are not comfortable pretending to offer Device Health at this time.
