Negative Measurements Alert


I have a Prometheus metric of gauge type that monitors a throughput. From time to time, some devices register negative throughput. When this happens, I need an alert to trigger.
The difficult part:
I need the alert to send an email and resolve itself immediately upon this happening, and then NOT trigger for this specific value from this specific device again. The value is recorded and will not be deleted, nor will it go above 0.

Is there a way for me to stop the alert from retriggering? I can set up this alert directly in prometheus, if it would help in some way.

Thanks in advance