Re: How do I create an alert that summarizes a group of nodes going down (and prevents a whole slew of alerts for the individual nodes)?

Suggestion 1: Under NPM Settings -> Node & Group Management -> You can use 'Manage Dependencies' to restrict the same.

Suggestion 2: To improvise your setup, as a next step you can segregate the nodes by grouping them accordingly by using 'Manage Groups', once you are done with Parent & Child Groups, you can use these Groups in 'Manage Dependencies'. This would be a systematic approach, but then it again depends on what best suits your requirement.

Hope this helps