Here is a great article I found today. This is affecting my management servers.
The overall Entity Heath for one or more Management Servers displays Critical in the Operations Manager Console. Upon opening the Health Explorer against an affected Management Server, the Monitors affecting the overall Entity Health are either:
Health Service Handle Count Threshold
Health Service Private Bytes Threshold
or both of the above threshold monitors.
Read the entire article and workaround on Clive Eastwood’s Blog.