I am using AppInsight for Exchange to monitor my exchange servers. I have 2 mailbox servers (both are VMs) set up in a DAG. The problem is that the servers are always in an UNKNOWN state, because the exchange Perfmon counters keep disabling themselves after about a day or so. I can confirm this on the exchange MB server, in the registry: HKLM\SYSTEM\CurrentControlSet\Services\msftesqllDX-Exchange\Performance, where the "Disable Performance Counters" is non-zero. I've searched the event logs and can't really figure out why it is getting disabled. And if I change it back to 0, the counters will start working again, and everything turns green--for about a day. Then something disables the counters again, and it goes back to Unknown...
I have tried re-installing the libraries from scratch, but the result is the same--it works at first, but then stops within a day. Everything in the "Information Store" is unavailable (Active Connection Count, Active User Count, RPC Requests, RPC Averaged Latency, etc.)
My active mailbox server also has some other "Custom Statistic Monitors" that are "Unknown". Not sure if this is related or not...
I know that this is not necessarily a SAM issue, just wondering if anyone had seen this before?