Scrobble is a made-up word by Last.fm that basically lets users create a play history from any client that will hit their API. Pleroma has a scrobble API as well, and this is my first attempt to actually make use of it.
Right now I have a little web extension that monitors my YouTube/Spotify/etc use and hits the Pleroma API. I have a separate PR for that here: https://github.com/web-scrobbler/web-scrobbler/pull/3908
I’ll likely also write a Last.fm –> fedi scrobble bridge, since Last.fm works with basically everything as-is.