Currently I keep a list of people who need to be alerted to certain events in a Google Spreadsheet. I share this spreadsheet between the appropriate admins so they can update it. I use the Sheets API to get data from the appropriate cells.
I found this to be a bit clunky, so I hacked something together with https://form.io. It works pretty well - you can design a form, do a submission of the form and then send your admins a link to edit that submission using the form. You can grab the data behind that singleton submission by API from your code.
But I'm thinking there must be a better tool for this?
Zapier have this: https://zapier.com/help/create/storage-and-digests/storage-examples-in-zaps , but it's geared toward maintaining state rather than configuration.
This seems like a common problem - surely there's a better way?

