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.)
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My active mailbox server also has some other "Custom Statistic Monitors" that are "Unknown". Not sure if this is related or not...
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I know that this is not necessarily a SAM issue, just wondering if anyone had seen this before?