based on these metrics.</p><p>The <a href=/v1.18/docs/reference/config/metrics/>standard Istio metrics</a> are
exported to <a href=/v1.18/docs/ops/integrations/prometheus/>Prometheus</a> by default.</p><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_s