</a>. As traffic flows into a service within a mesh, Istio can generate a full record of each request, including source and
destination metadata. This information enables operators to audit service behavior down to the individual
<a href=/v1.15/docs/reference/glossary/#workload-instance>workload instance</a> level.</li></ul><h2 id=metrics>Metrics</h2><p>Metrics provide a way of monitoring and understanding behavior in aggregate.</p><p>To monitor service behavior, Istio generates metrics for all service traf