fix ETCD cluster config environment variables not working. (#8255)

CHANGES.md

@@ -12,6 +12,7 @@ Release Notes.
 
 * Fix potential NPE in OAL string match and a bug when right-hand-side variable includes double quotes.
 * Bump up Armeria version to fix CVE.
+* Polish ETCD cluster config environment variables.
 
 #### UI
 

docs/en/setup/backend/backend-cluster.md

@@ -99,10 +99,10 @@ cluster:
     # etcd cluster nodes, example: 10.0.0.1:2379,10.0.0.2:2379,10.0.0.3:2379
     endpoints: ${SW_CLUSTER_ETCD_ENDPOINTS:localhost:2379}
     namespace: ${SW_CLUSTER_ETCD_NAMESPACE:/skywalking}
-    serviceName: ${SW_SCLUSTER_ETCD_ERVICE_NAME:"SkyWalking_OAP_Cluster"}
+    serviceName: ${SW_CLUSTER_ETCD_SERVICE_NAME:"SkyWalking_OAP_Cluster"}
     authentication: ${SW_CLUSTER_ETCD_AUTHENTICATION:false}
-    user: ${SW_SCLUSTER_ETCD_USER:}
-    password: ${SW_SCLUSTER_ETCD_PASSWORD:}
+    user: ${SW_CLUSTER_ETCD_USER:}
+    password: ${SW_CLUSTER_ETCD_PASSWORD:}
 ```
 
 Same as the Zookeeper coordinator,

oap-server/server-starter/src/main/resources/application.yml

@@ -41,10 +41,10 @@ cluster:
     # etcd cluster nodes, example: 10.0.0.1:2379,10.0.0.2:2379,10.0.0.3:2379
     endpoints: ${SW_CLUSTER_ETCD_ENDPOINTS:localhost:2379}
     namespace: ${SW_CLUSTER_ETCD_NAMESPACE:/skywalking}
-    serviceName: ${SW_SCLUSTER_ETCD_ERVICE_NAME:"SkyWalking_OAP_Cluster"}
+    serviceName: ${SW_CLUSTER_ETCD_SERVICE_NAME:"SkyWalking_OAP_Cluster"}
     authentication: ${SW_CLUSTER_ETCD_AUTHENTICATION:false}
-    user: ${SW_SCLUSTER_ETCD_USER:}
-    password: ${SW_SCLUSTER_ETCD_PASSWORD:}
+    user: ${SW_CLUSTER_ETCD_USER:}
+    password: ${SW_CLUSTER_ETCD_PASSWORD:}
   nacos:
     serviceName: ${SW_SERVICE_NAME:"SkyWalking_OAP_Cluster"}
     hostPort: ${SW_CLUSTER_NACOS_HOST_PORT:localhost:8848}