MISSIVE</code> mode is enabled, a service can accept both plain text and mutual TLS traffic. In order to only allow
mutual TLS traffic, the configuration needs to be changed to <code>STRICT</code> mode.</p><p>You can use the <a href=/v1.13/docs/tasks/observability/metrics/using-istio-dashboard/>Grafana dashboard</a> to
check which workloads are still sending plaintext traffic to the workloads in <code>PERMISSIVE</code> mode and choose to lock
them down once the migration is done.</p><h2 id=before-you-begin>