d.</p><pre><code class=language-yaml data-expandlinks=true data-repo=istio>destination_workload_namespace: destination.workload.namespace | &#34;unknown&#34;
</code></pre></li><li><p><strong>Destination Principal</strong>: This identifies the peer principal of the traffic destination.
It is set when peer authentication is used.</p><pre><code class=language-yaml data-expandlinks=true data-repo=istio>destination_principal: destination.principal | &#34;unknown&#34;
</code></pre></li><li><p><strong>Destination 