<h3 id=blackholecluster-metrics>BlackHoleCluster metrics</h3><p>Similar to the PassthroughCluster, this section explains the metrics and the
labels emitted based on the listener type invoked in Envoy.</p><ul><li><p>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 BlackHoleCluster is hit,
<code>istio_requests_total</code> will get increased like this:</p><pre><code class=language-json data-expandlink