istio envoy sidecar 指定版本rule后

对bookinfo所有服务施加版本1的VirtualService之前,cluster里无版本号

$ istioctl proxy-config route productpage-v1-7f4cc988c6-qxqjs.istio-bookinfo --name 9080 -o json | grep -A 60 '"name": "reviews.istio-bookinfo.svc.cluster.local:9080",'
                "name": "reviews.istio-bookinfo.svc.cluster.local:9080",
                "domains": [
                    "reviews.istio-bookinfo.svc.cluster.local",
                    "reviews.istio-bookinfo.svc.cluster.local:9080",
                    "reviews",
                    "reviews:9080",
                    "reviews.istio-bookinfo.svc.cluster",
                    "reviews.istio-bookinfo.svc.cluster:9080",
                    "reviews.istio-bookinfo.svc",
                    "reviews.istio-bookinfo.svc:9080",
                    "reviews.istio-bookinfo",
                    "reviews.istio-bookinfo:9080",
                    "10.105.236.72",
                    "10.105.236.72:9080"
                ],
                "routes": [
                    {
                        "name": "default",
                        "match": {
                            "prefix": "/"
                        },
                        "route": {
                            "cluster": "outbound|9080||reviews.istio-bookinfo.svc.cluster.local",
                            "timeout": "0s",
....

施加版本v1的VirtualService后, 可以看到cluster中指定了版本号

$ istioctl proxy-config route productpage-v1-7f4cc988c6-qxqjs.istio-bookinfo --name 9080 -o json | grep -A 60 '"name": "reviews.istio-bookinfo.svc.cluster.local:9080",'
                "name": "reviews.istio-bookinfo.svc.cluster.local:9080",
                "domains": [
                    "reviews.istio-bookinfo.svc.cluster.local",
                    "reviews.istio-bookinfo.svc.cluster.local:9080",
                    "reviews",
                    "reviews:9080",
                    "reviews.istio-bookinfo.svc.cluster",
                    "reviews.istio-bookinfo.svc.cluster:9080",
                    "reviews.istio-bookinfo.svc",
                    "reviews.istio-bookinfo.svc:9080",
                    "reviews.istio-bookinfo",
                    "reviews.istio-bookinfo:9080",
                    "10.105.236.72",
                    "10.105.236.72:9080"
                ],
                "routes": [
                    {
                        "match": {
                            "prefix": "/"
                        },
                        "route": {
                            "cluster": "outbound|9080|v1|reviews.istio-bookinfo.svc.cluster.local",
                            "timeout": "0s",