discourse/app/views/common/_google_universal_analytics.html.erb

<script>
  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

  ga('create', '<%= SiteSetting.ga_universal_tracking_code %>', <%= ga_universal_json %>);

  <% if SiteSetting.ga_universal_auto_link_domains.present? %>
  ga('require', 'linker');
  ga('linker:autoLink', <%= raw SiteSetting.ga_universal_auto_link_domains.split('|').to_json %>);
  <% end %>

</script>