Open questions:

• Should this be an opt-in feature?
• Who should be informed?
  • Current idea: Only original author because of cleanup tasks like cropping which might lead to loads of notifications otherwise. This also fits to current behavior like: When a page you created gets linked to, the original author is notified

Possible ways of implementing it:
—> Look on Commons where this is used _> Commons notification
—> Implement the notification on all wikis —> local wiki notification

On local wiki, one could look at file changes before/after the edit (as we do for mention notifications, too)

In theory: If global notification on Commons is updated (Does this happen without anyone looking at it?), we send the message out. But can each wiki take care of their own files?

It needs to be done on ALL files, not just Commons files. So for a not-commons-file, everything happens just within the wiki. For a Commons file, everything happens on Commons and the other file

Opt-out on a per-file basis is REALLY complicated. We would have to have a list of some sort.

Bundling of messages:
WHY?would be good when somebody uploads an icon that is used on loads of places
WHAT WOULD IT MEAN: We would need to record what happened

Recording of state as needed for bundling or for opt-in/-out on a per file basis would lead to needing a list („watchlist?“). There are multiple options:

• Watcher list on the file, lying at the same place as the file
• Watcher list lying with the user
• THIS SEEMS TO BE VERY DANGEROUS