pts doc. Before attempting this task, you should be familiar with important terms such as <em>destination rule</em>, <em>virtual service</em>, and <em>subset</em>.</p></li></ul><h2 id=about-this-task>About this task</h2><p>The Istio <a href=/v1.5/docs/examples/bookinfo/>Bookinfo</a> sample consists of four separate microservices, each with multiple versions.
Three different versions of one of the microservices, <code>reviews</code>, have been deployed and are running concurrently.
To illustrate the problem 