title: What's the easiest way to get insights on github PR review activity across a repository?
body: <p>I'd like information, similar to what is provided on the insights tab for commits, but for code review activity.  In particular, either</p>
  
  <ul>
  <li>the number of Pull request review comments over time</li>
  <li>the number of specific (say lgtm) comments given</li>
  <li>the number of lines of code (and maybe number of files) that were reviewed as well</li>
  </ul>