• Put under review badge to the pull request
• Does the example code implement the pattern correctly and follow good coding practices?
• Does the example code have enough test coverage?
• Is the example code commented well enough?
• Is the example code following JavaDoc conventions?
• Are the project coding conventions being followed?
• Is the class diagram generated correctly?
• Is the index.md implemented correctly so the pattern will show correctly on the web site?

I would put Producer-Consumer under concurrency patterns, but I do not count this as a mistake. Overall this pull request looks about as good as they get. No complaints from me, this is excellent work @hoswey !