Hello!
Collaboration team is please to announce that Cross-wiki notifications will be available as a Beta feature on MediaWiki by February 19th at 01h00 UTC.
Cross-wiki notifications will help you know about some activity on another wiki. How does it work? Imagine someone thanks you on Commons - the next time you open a page on MediaWiki, you'll see that notification from Commons! We hope this will help everyone who is active on multiple wikis. You will find more information in the documentation.
Of course, this is a Beta Feature. We have tested many possible cases, but you may experience some problems. If so (and we are sorry about that), please report it on the dedicated page (in any language).To activate the feature, go to your preferences, Beta tab, and select the "Enhanced notifications" checkbox. You will then receive Notifications on MediaWiki when they happen on any other wiki. You will receive these notifications only on MediaWiki or any wiki where you have activated the feature (Beta testers: Wikidata, MediaWiki, Commons, all Hebrew and French wikis).
If you do not activate it, nothing will change on your Notifications panel.
If you have any questions, please ask!