Template parameters include
- mediawiki
- required version of MediaWiki
but is this the earliest version of MediaWiki for which there's a branch of the extension, or the earliest version of MediaWiki on which the extension's latest master will work?
There seems to be consensus that instead of the "master" branch supporting old MediaWiki releases, developers on releases should use the version of the extension tagged for that release from Special:ExtensionDistributor.