Are there any plans to convert this extension to use the modern ExtensionRegistry mechanism?
Topic on Extension talk:Google Analytics Integration
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I have a fork that does it (and a few other changes - see the README file): https://github.com/kolzchut/mediawiki-extensions-GoogleUniversalAnalytics
I guess I should merge my changes at same point, although we mostly use Google Tag Manager nowadays and this is mostly a legacy extension.
Do you have a link to the Google Tag Manager extension to which you are referring? I don't see one here and Extension:Google Tag Manager is archived.
I really should add it on here: https://github.com/kolzchut/mediawiki-extensions-GoogleTagManager
I just pushed an update to the extension - apparently I was using a custom hook for adding some HTML, which definitely wasn't going to work for general consumption.