As a blocker to T108557 going any further...
MediaWiki-extensions-UrlShortener is wanted by various projects, and is half deployed on Wikimedia Wikis in a read-only state. There is no owner of the extension or its deployment, as such, it's currently stuck.
It has been installed in a readonly mode for the last 2 years - https://github.com/wikimedia/operations-mediawiki-config/commit/6696f1e5dad6d2a02c40c4464f47d6e270855879
Was it a cause of production outages or incidents? List them.
Does it have sufficient hardware resources for now and the near future (to take into account expected usage growth)?
Is it a frequent cause of monitoring alerts that need action, and are they addressed timely and appropriately?
When it was first deployed to Wikimedia production
Usage statistics based on audience(s) served
Changes committed in last 1, 3, 6, and 12 months
Reliance on outdated platforms (e.g. operating systems)
Number of developers who committed code in the last 1, 3, 6, and 12 months
Number and age of open patches
Number and age of open bugs
Number of known dependencies?
Is there a replacement/alternative for the feature? Is there a plan for a replacement?