rnal 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 augmenting the Istio configuration for attribute generation
and Prometheus handler. You should be careful about cardinality explosion in
time series if you have many services wi