.</li><li><code>NOT SENT</code> means that Istiod hasn&rsquo;t sent anything to Envoy. This usually is because Istiod has nothing to send.</li><li><code>STALE</code> means that Istiod has sent an update to Envoy but has not received an acknowledgement. This usually indicates
a networking issue between Envoy and Istiod or a bug with Istio itself.</li></ul><h2 id=retrieve-diffs-between-envoy-and-istiod>Retrieve diffs between Envoy and Istiod</h2><p>The <code>proxy-status</code> command can also be used to ret