It's a feature within Sifter. Here's a few blog posts that go over the details. http://journal.sifterapp.com/blog/2007/08/bug-issue-tracking/ http://journal.si

It's a feature within Sifter. Here's a few blog posts that go over the details. http://journal.sifterapp.com/blog/2007/08/bug-issue-tracking/ http://journal.sifterapp.com/blog/2007/08/bug-issue-tracking... http://journal.sifterapp.com/blog/2007/08/tracker-status-comments/ http://journal.sifterapp.com/blog/2007/08/tracker-status-com... http://journal.sifterapp.com/blog/2011/07/resolved-vs-closed/ http://journal.sifterapp.com/blog/2011/07/resolved-vs-closed...