HI,
last week I had an issue on my on-prem Horizon infrastructure:
Over the course of 2/3 days many agents on Manual VDI Pools and RDSH hosts went into an unreachable state.
Reboot did't help, the only way to re-establish the connectivity was an re-install.
Support couldn't really help, apart: yea some issue, re-install the agents. I'm the only one with this issue?
I suspect that the credentials between the connection servers and the agents where invalidated and the re-install recreates them, but I see nothing obvious in the logs.