After upgrading from latest hudson to jenkins 1.449 "New version of Jenkins (2.2.0) is available for download (change log)" shows in yellow at Manage Jenkins screen. But I believe 1.449 is the latest and current version?

Related, on the manage plugins screen four are listed with red text "Warning: This plugin is built for Jenkins 2.2.0 or newer. It may or may not work in your Jenkins" but again, what is Jenkins 2.2.0?

I'm guessing this is some leftover update mess from Hudson 2.2.0 but I can't figure out how to clear these msgs out.