own to be unhealthy.</li>
<li>An operator (via a front-end) can send a <code>GetUnhealthyRacks</code> message addressed to that <strong>DataCenterFun</strong>, and wait for the corresponding response <code>message(UnhealthyRacks)</code>. Whenever a rack reports <em>OK</em>, it&rsquo;ll be removed from the unhealthy racks map.</li>
</ol>
<h2 id="conclusion">
  Conclusion
  <a class="anchor" href="#conclusion">#</a>
</h2>
<p>This pattern — where each layer of functions performs a stateful aggregation of eve