productpage-(DestinationRule)
工作负载：
reviews-v1(Deployment)
reviews(Virtualservice)
应用视角：
reviews(DestinationRule)
bookinfo-(Virtualservice)
rating(webserver)
Gateway（istio crd)
webservice = deployment
服务视角：
productpage(Service)
DestinationRule.spec.host
bookinfo(Gateway)
Service
details(Deployment)
rating(Virtualservice)
reviews-v3(Deployment)
reviews-v2(webservice)
reviews(Service)
productpage(webserver)
运维特征：
服务（service） = 1 * 工作负载（workload）+ 运维特征（traits）* N【N >= 0】
details(Service)
bookinfo = productpage + reviews + details + rating
reviews-v1(webserver)
Ingress、Hpa、VirtualService、DestinationRule、PromethusRuleServiceMonitor、Canary
k8s资源视角：
DestinationRule.spec.subsets.labels
rating(Service)
reviews-v2(Deployment)
reviews-v3(webservice)
Deployment
rating(Deployment)
webserver = deployment + service
productpage(Virtualservice)
代码(pod)里写死的服务地址
VirtualService（Istio crd）
DestinationRule（Istio crd)
details(webserver)
rating(DestinationRule)
VirtualService.spec.http.route.destination
productpage(Deployment)
