Not sure what you're asking for here. Are you wanting to report on Response Time or packet loss? Response time is in ms, so there's not really a way to say response time goes over 10% without setting a baseline of what would be "acceptable" response time.
Actually I found a custom alert that will do it.
Here it is if anyone wants it.
You need to create a Custom SQL Alert
Then add the text below:
JOIN ResponseTime ON Nodes.NodeID=ResponseTime.NodeID
WHERE ResponseTime.DateTime BETWEEN DATEADD(Day, -7, getdate()) AND Getdate()
AND Nodes.Device_Type LIKE 'Router'
Group By Nodes.NodeID, Nodes.Caption, Nodes.AvgResponseTime
Having Nodes.AvgResponseTime > 1.10*(AVG(ResponseTime.AvgResponseTime))
You just have to make sure that you have the Device_Type custom property configured in your environment, otherwise the alert won't trigger for you. There is a bit of a flaw in the logic as the query is looking for any node that has an average that is 10% greater than and average of it's average of that week. There's going to be some issues in how that calculation works.