title: Google Analytics - How to get the client_id (anonymous client id) sent with Measurement Protocol
body: <p>we are seding requests like this throught the google analytics measurement protocol to track user interaction there. For us its important to be to link a interaction to a specific user so we where happy to be able to set the "cid" attribute of the protocol. </p>
  
  <p>my problem is that I cannot find this Client ID somewhere inside the reports of google analytics. Even when customizing the reports I cannot find a Dimension which allows me to display this information. </p>
  
  <pre><code>http://www.google-analytics.com/collect?
   v=1             // Version.
   &amp;tid=UA-XXXX-Y  // Tracking ID / Property ID.
   &amp;cid=555        // Anonymous Client ID.
  
   &amp;t=event        // Event hit type
   &amp;ec=video       // Event Category. Required.
   &amp;ea=play        // Event Action. Required.
   &amp;cm18=8000
   &amp;cd6=crocodile
  </code></pre>
  
  <p>Do you have an idea of how the cid could be found there?</p>