t be met for the patch
to be applied to a cluster.</p>

<table class="message-fields">
<thead>
<tr>
<th>Field</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr id="EnvoyFilter-ClusterMatch-port_number">
<td><div class="field"><div class="name"><code><a href="#EnvoyFilter-ClusterMatch-port_number">portNumber</a></code></div>
<div class="type">uint32</div>
</div></td>
<td>
<p>The service port for which this cluster was generated.  If
omitted, applies to clusters for any port.
<strong>Note:</strong> for inb