There is a scenario in Performance Management whereby a Data Aggregator (DA) polled device has been temporarily removed from the network. The device is still in the Performance Center Inventory.
There are Events being generated against it based on a Reachability/Availability condition.
Because the device is no longer on the network, an Event is raised on each poll that states:
"Polling has been temporarily reduced due to prior timeouts. Check the PollSummary.log for more details. The device may be down or may be receiving more polls than it can respond to"
On each poll after we log that event, we log a clear with the following text:
"Normal Polling Has Resumed"
All supported Performance Management releases
Try increasing the timeout for the effected devices as per the instructions in the following KB article: