Polish docs and samples of Envoy RLS token server module for RLS v3 API

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

sentinel-cluster/sentinel-cluster-server-envoy-rls/README.md

@@ -3,6 +3,8 @@
 This module provides the [Envoy rate limiting gRPC service](https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/other_features/global_rate_limiting#arch-overview-rate-limit) implementation
 with Sentinel token server.
 
+The token server has supported both Envoy RLS v2 and v3 API. Since Envoy 1.18.0, v2 API support has been removed.
+
 > Note: the gRPC stub classes for Envoy RLS service is generated via `protobuf-maven-plugin` during the `compile` goal.
 > The generated classes is located in the directory: `target/generated-sources/protobuf`.
 
@@ -19,7 +21,7 @@ mvn clean package -P prod
 Sentinel RLS token server supports dynamic rule configuration via the yaml file.
 The file may provide rules for one *domain* (defined in Envoy's conf file).
 In Envoy, one rate limit request might carry multiple *rate limit descriptors*
-(which will be generated from [Envoy rate limit actions](https://www.envoyproxy.io/docs/envoy/v1.12.1/api-v2/api/v2/route/route.proto#envoy-api-msg-route-ratelimit)).
+(which will be generated from [Envoy rate limit actions](https://www.envoyproxy.io/docs/envoy/v1.20.1/api-v3/config/route/v3/route_components.proto#envoy-v3-api-msg-config-route-v3-ratelimit)).
 One rate limit descriptor may have multiple entries (key-value pair).
 We may set different threshold for each rate limit descriptors.
 

sentinel-cluster/sentinel-cluster-server-envoy-rls/sample/k8s/README.md

@@ -87,12 +87,6 @@ Then we could set rate limit rules for each target clusters.
 
 After preparing the yaml template, you may deploy the Envoy instance:
 
-```bash
-kubectl apply -f sample/k8s/envoy.yml
-```
-
-for v3 api：
-
 ```bash
 kubectl apply -f sample/k8s/envoy-v3-api.yml
 ```

sentinel-cluster/sentinel-cluster-server-envoy-rls/sample/k8s/envoy-legacy-v2-api.yml

@@ -1,3 +1,4 @@
+# NOTE: legacy V2 API sample, which has been deprecated
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -82,7 +83,7 @@ data:
                     address: sentinel-rls-service
                     port_value: 10245
 ---
-apiVersion: apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: envoy-deployment-basic

sentinel-cluster/sentinel-cluster-server-envoy-rls/sample/k8s/envoy-v3-api.yml

@@ -1,7 +1,7 @@
 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: envoy-cm-17
+  name: envoy-cm
 data:
   envoy-yml: |-
     admin:
@@ -94,22 +94,22 @@ data:
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: envoy-deployment-basic-17
+  name: envoy-deployment-basic
   labels:
-    app: envoy-17
+    app: envoy
 spec:
   replicas: 1
   selector:
     matchLabels:
-      app: envoy-17
+      app: envoy
   template:
     metadata:
       labels:
-        app: envoy-17
+        app: envoy
     spec:
       containers:
         - name: envoy
-          image: envoyproxy/envoy:v1.17.3
+          image: envoyproxy/envoy:v1.20.1
           ports:
             - containerPort: 10000
           command: ["envoy"]
@@ -120,7 +120,7 @@ spec:
       volumes:
         - name: envoy-config
           configMap:
-            name: envoy-cm-17
+            name: envoy-cm
             items:
               - key: envoy-yml
                 path: envoy.yaml
@@ -128,14 +128,14 @@ spec:
 apiVersion: v1
 kind: Service
 metadata:
-  name: envoy-service-17
+  name: envoy-service
   labels:
-    name: envoy-service-17
+    name: envoy-service
 spec:
-  type: NodePort
+  type: ClusterIP
   ports:
     - port: 10000
       targetPort: 10000
       protocol: TCP
   selector:
-    app: envoy-17
+    app: envoy

sentinel-cluster/sentinel-cluster-server-envoy-rls/sample/k8s/sentinel-rls.yml

@@ -11,7 +11,7 @@ data:
           value: "service_httpbin"
         count: 1
 ---
-apiVersion: apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: sentinel-rls-server