Is your feature request related to a problem? Please describe.

I am using Discord and I want the success and fail notifications. I would like a channel alert during the fail messages. I approached shoutrrr about this and it's on their radar but no timetable.

Describe the solution you'd like

Another approach would be on the offen side, you could have separate success/fail variables for the notifications, only overriding NOTIFICATION_URLS if they're set, thus not changing current behavior. Then I could set the failure channel to alert me on message received.