I am newbie to istio world. I am following along https://istio.io/docs/tasks/traffic-management/request-routing/ tasks. I provisioned bookinfo application successfully. Later I moved on to traffic management tasks. After applying virtual services in configure request routing task, the product page service is unable to talk to other services and also i don’t see any destionationrules defined here as part of https://raw.githubusercontent.com/istio/istio/release-1.0/samples/bookinfo/networking/virtual-service-all-v1.yaml !! will those rules gets defined automatically or do we need to create them !!!