.20/img/icons.svg#callout-warning"/></svg></div><div class=content>This is work in progress. We will add its sections in pieces. Your feedback is welcome at <a href=https://discuss.istio.io>discuss.istio.io</a>.</div></aside></div><p>Before the advent of microservice architecture, development teams built,
deployed and ran the whole application as one large chunk of software. To test a
small change in their module not merely by unit testing, the developers had to
build the whole application. Therefore the bu