Alert based on specific sensor

I have several DC switches in my environment that Libre currently monitors what it calls “DCDC Input Voltage”
I want to be able to create an alert rule that specifies these switches only, and to alert if the Input voltage drops below a certain threshold (so that I know the switch is likely running on battery)

any help as to how I should create the alert rule would be appreciated.

I suggest you make a generic alert and create a new alert template to show you which ones have issues.

this was actually considerably easier than I anticipated. Thanks for the suggestions.