management/egress/egress-control/#change-to-the-blocking-by-default-policy>change Istio to the blocking-egress-by-default policy</a>.</p><p>This application uses the <code>ratings</code> microservice to fetch book ratings, a number between 1 and 5. The ratings are
displayed as stars for each review. There are several versions of the <code>ratings</code> microservice. You will deploy the
version that uses <a href=https://www.mongodb.com>MongoDB</a> as the ratings database in the next subsection.</p><p>The ex