We have recently been having an issue with one of our Polling engines actually polling the nodes assigned to it. As per support, they said the following alert should alert us when it stop polling:
Alert me when a managed node last poll time is 10 minutes old
Anyways, we enabled and configured it, only when it did in fact stop polling, it sent us over 700 emails within a minute for every device it was managing. I had to go in and disable the alert. Is there a way we can configure it so it will only send one alert? I included a screenshot of the current trigger configuration.