Previously, I covered, at a high level, how our builds work [https://blog.dadops.co/2013/10/12/how-we-deliver-features-to-pinners/] and what tools we used [https://blog.dadops.co/2013/10/06/tools-we-use-to-release-pinterest/]. I wanted to explain what exactly we are doing during a deploy, with an emphasis on tracking state.