="discussion">
    <p class="note returns_void">This method returns an undefined value.</p><p>Logs a message at warn level</p>


  </div>
</div>
<div class="tags">
  <p class="tag_title">Parameters:</p>
<ul class="param">
  
    <li>
      
        <span class='name'>message_or_exception</span>
      
      
        <span class='type'>(<tt>String</tt>, <tt>Exception</tt>)</span>
      
      
        <em class="default">(defaults to: <tt>nil</tt>)</em>
      
      
        &mdash;
        <div class='inlin