4;1&#34;
  ]
}
</code></pre><p>Note the <code>destination_ip</code> label represents the IP address of the external
service and the <code>destination_service_name</code> is set to BlackHoleCluster
to indicate that this traffic was blocked by the mesh. Is is interesting to
note that for the BlackHole cluster case, other TCP related metrics like
<code>istio_tcp_connections_opened_total</code> are not increased as there&rsquo;s no
connection that is ever established.</p></li></ul><p>Monitoring these metrics ca