When I setup the Drupal contrib search engine , the goal was to detect modules we'd break with a code change in Drupal Core. It works but I wanted to know more than that, so I spent a couple of weeks getting more data. I want to start with a huge thank you to my long time sponsors: Palantir.net and Vardot . They've been a huge help in my ability to spend time working on Drupal Core, and it's thanks to them that I can spend time digging into this data. What data are we talking about? Over the next few blog posts, we'll be looking at what happened at the code level for Drupal Core and Drupal contrib over the last 10 years: When Drupal Core deprecate or add a feature, how long does it take for contrib to upgrade or adopt?  What is the impact of Drupal CMS on contrib code?  Contrib depends directly on a lot of @internal code, what do they need exactly?…