rsions of a source service to all versions of a destination service without any rules being set, as soon as version discrimination is desired rules are going to be needed. Therefore, setting a default rule for every service, right from the start, is generally considered a best practice in Istio.</p><h2 id="egress-rules">Egress Rules</h2><p>Egress rules are used to enable requests to services outside of an Istio service mesh. For example, the following rule can be used to allow external calls to services hos