Change Details

#MediaWiki-extensions-CustomData is superseded by `ParserOutput#setExtensionData` and `#getExtensionData` so it should be deprecated. ### AC [] The RelatedArticles extension is updated to use the new-ish `ParserOutput` methods [] Update [the RelatedArticles extension page](https://www.mediawiki.org/wiki/Extension:RelatedArticles) to reflect that the extension no longer requires the CustomData extension [x] Email wikitech-l to see which other extensions rely on the CustomData extension and need to be updated

#MediaWiki-extensions-CustomData is superseded by `ParserOutput#setExtensionData` and `#getExtensionData` so it should be deprecated. ### AC [] The RelatedArticles extension is updated to use the new-ish `ParserOutput` methods [x] ~~Update [the RelatedArticles extension page](https://www.mediawiki.org/wiki/Extension:RelatedArticles) to reflect that the extension no longer requires the CustomData extension~~ T115019 [x] Email wikitech-l to see which other extensions rely on the CustomData extension and need to be updated

#MediaWiki-extensions-CustomData is superseded by `ParserOutput#setExtensionData` and `#getExtensionData` so it should be deprecated. ### AC [] The RelatedArticles extension is updated to use the new-ish `ParserOutput` methods [] x] ~~Update [the RelatedArticles extension page](https://www.mediawiki.org/wiki/Extension:RelatedArticles) to reflect that the extension no longer requires the CustomData extension~~ T115019 [x] Email wikitech-l to see which other extensions rely on the CustomData extension and need to be updated