title: How to trigger a tag only sometimes?
body: <p>Like, a percentage of the times.</p>
  <p>The first thing that comes to mind is doing something like</p>
  <pre class="lang-js prettyprint-override"><code>if (0.10 &lt; Math.random()) { /* send event */ }
  </code></pre>
  <p>But What I'm asking, is, is there a more elegant way of doing so? like a configuration that I couldn't find on the dashboard, or something the API presents for doing so?</p>