Farewell, Google Code. It's been a great service that's contributed immeasurably to the open source community over the years. And thanks for the Github exporter :-)
Migration notes for project owners:
1. The wiki syntax doesn't get converted to Markdown used by Github, but my friends at ArcBees have created a nice tool for this: https://github.com/ArcBees/arcbees-tools/tree/master/googlecode_wiki_to_github_markdown
2. Beware the Project Moved flag! Once you set it, there's no way back. See also the comment by Dominykas on the linked blog post.