title: How to create a custom monolog file only for users login in symfony
body: <p>I need implement a simple log system for users. In the bundle actions of users (for example), i would like to use monolog with some samples like this.</p>
  
  <pre><code>public function indexAction(){
          $logger = $this-&gt;get('logger');
          $logger-&gt;users('User {X} is logout');
  }
  </code></pre>
  
  <p>And it log, saves in specific file this log (users.log) for example</p>