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That is not possible in the product today. You may want to create a feature request so we can track that and consider it for a future release as well as gauge the interest in such a feature from other customers: Web Performance Monitor (formerly SeUM) Feature Requests
This is not possible in WPM but you could try to create a Custom Script with your Device and use SAM for this. Then, assign that script to the Device and you can create an Alert base on the output of the Custom Script.