ne to externally control service monitoring and tracing, request (version) routing, resiliency testing, security and policy enforcement, etc., in a consistent way across the services, for the application as a whole.</p><p>In this guide, we will use the <a href="/v0.3/docs/guides/bookinfo.html">Bookinfo sample application</a> to show how operators can dynamically configure request routing and fault injection for a running application.</p><h2 id="before-you-begin">Before you begin</h2><ul><li><p>Install the I