This is a Custom SQL Based up on the Last Sync Alert added in 10.1. This will alert if the Last Time Updated was 10+ minutes ago, and the Node is Not Down, Unmanaged, or External.
This is useful for making sure UnDP is working for your Nodes. If your UnDPs stop working, but test out fine, there could be an issue with the Job Engine v1 SDF File. If you are on 10.1.2 and lower, please see the following KB to replace the SDF File: