th non-stable IP addresses.</p><h3 id=passthroughcluster-metrics>PassthroughCluster metrics</h3><p>This section explains the metrics and the labels emitted based on the listener
type invoked in Envoy.</p><ul><li>HTTP proxy listener: This happens when the port of the external service is
same as one of the service ports defined in the cluster. In this scenario,
when the PassthroughCluster is hit, <code>istio_requests_total</code> will get increased
like this:</li></ul><pre><code class=language-json data-expan