roxy or HTTP proxy that gets invoked, one of these metrics
will be incremented.</p><p>Additionally, in case of a TCP proxy listener in order to see the IP address of
the external service that is blocked or allowed via BlackHole or Passthrough
cluster, you will need to add the <code>destination_ip</code> label to the
<code>istio_tcp_connections_closed_total</code> metric. In this scenario, the host name of
the external service is not captured. This label is not added by default and can
be easily added by aug