OK, then I suggest that the notifications configuration should be overhauled to use an include mechanism similar to the events configuration, ie. so groups of notifications can easily be included/excluded.

Does that require a separate enhancement request?

It's impractical to create notification definitions for every event that OpenNMS can recognize. Your request would result in the addition of almost a thousand notification definitions:

$ grep '<uei' Dell*.events.xml | wc -l
931

Imagine for a moment that your enterprise uses no Dell whatsoever, but every time you install OpenNMS you have to remove all those unwanted definitions.

Won't fix.