I added my first PR to #Mastodon today!
https://github.com/mastodon/mastodon/pull/38809
It's to add a notifications policy to filter notifications from bots; it's one of the big requests I've had for tags.pub. It turns out Mastodon has a really complete framework for filtering notifications, as well as a user flag for bots, and I was able to hook into those and make a very minimal set of changes to add this useful feature.
Fingers crossed that it gets reviewed and accepted! 🤞🏼