 Bookinfo application to the v1 version of the <code>reviews</code> service. It will then send traffic only from a specific test user to version v2, leaving all other users unaffected.</p></li><li><p><a href="/v0.3/docs/tasks/traffic-management/fault-injection.html">Fault injection</a> We will now use Istio to test the resiliency of the Bookinfo application by injecting an artificial delay in requests between the <code>reviews:v2</code> and <code>ratings</code> services. Observing the resulting behavior as 