<p>Use of the service-level metrics is entirely optional. Operators may choose to turn off generation and collection of these metrics to meet their individual
needs.</p><p>Example service-level metric:</p><pre><code class=language-json data-expandlinks=true data-repo=istio>istio_requests_total{
  connection_security_policy=&#34;mutual_tls&#34;,
  destination_app=&#34;details&#34;,
  destination_canonical_service=&#34;details&#34;,
  destination_canonical_revision=&#34;v1&#34;,
  destination_principal=&#34;c