title: What is "Staged rollout" on Google Play Developer?
body: <p>When I look at the detailed statistics for my app, namely "Current installs by device" filter, I can see sections: top 10, staged rollout, beta and alpha.</p>
  
  <p>I am not sure what does the term Staged rollout refer to?</p>
  
  <p>It's even more strange because there are no builds I pushed yesterday and today (reasonable for today). Could this be a number of builds which were being sent to users' devices? If you remember, when you publish the app, a user does not get notified immediately, but after a few days. Google probably makes priority based on app's population. </p>
  
  <p>PS. I've asked this on Android Enthusiasts, but they told me that this is a question concerned developers. If you  think that SO is the wrong place for this question, please suggest where I should post it. </p>