1.24/blog/2019/knative-activator-adapter/knative-activator.png title="Knative scale-from-zero"><img class=element-to-stretch src=/v1.24/blog/2019/knative-activator-adapter/knative-activator.png alt="Knative scale-from-zero"></a></div><figcaption>Knative scale-from-zero</figcaption></figure><p>The traffic for an idle application is redirected to <strong>Activator</strong> component by programming Istio with <code>VirtualServices</code>
and <code>DestinationRules</code>. When <strong>Activator</strong> receiv