Recover the module name of envoy-metric. (#2645)

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

@@ -10,7 +10,7 @@ We have following receivers, and `default` implementors are provided in our Apac
 1. **service-mesh**. gRPC services accept data from inbound mesh probes.
 1. **receiver-jvm**. gRPC services accept JVM metrics data.
 1. **istio-telemetry**. Istio telemetry is from Istio official bypass adaptor, this receiver match its gRPC services.
-1. **envoy-metrics**. Envoy `metrics_service` supported by this receiver. OAL script support all GAUGE type metrics. 
+1. **envoy-metric**. Envoy `metrics_service` supported by this receiver. OAL script support all GAUGE type metrics. 
 1. **receiver_zipkin**. See [details](#zipkin-receiver).
 1. **receiver_jaeger**. See [details](#jaeger-receiver).
 
@@ -35,7 +35,7 @@ service-mesh:
     bufferFileCleanWhenRestart: false
 istio-telemetry:
   default:
-envoy-metrics:
+envoy-metric:
   default:
 receiver_zipkin:
   default:

oap-server/server-receiver-plugin/envoy-metrics-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/envoy/EnvoyMetricReceiverModule.java

@@ -26,7 +26,7 @@ import org.apache.skywalking.oap.server.library.module.ModuleDefine;
  * @author wusheng
  */
 public class EnvoyMetricReceiverModule extends ModuleDefine {
-    public static final String NAME = "envoy-metrics";
+    public static final String NAME = "envoy-metric";
 
     public EnvoyMetricReceiverModule() {
         super(NAME);

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

@@ -100,7 +100,7 @@ service-mesh:
     bufferFileCleanWhenRestart: ${SW_SERVICE_MESH_BUFFER_FILE_CLEAN_WHEN_RESTART:false}
 istio-telemetry:
   default:
-envoy-metrics:
+envoy-metric:
   default:
 #receiver_zipkin:
 #  default:

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

@@ -100,7 +100,7 @@ service-mesh:
     bufferFileCleanWhenRestart: ${SW_SERVICE_MESH_BUFFER_FILE_CLEAN_WHEN_RESTART:false}
 istio-telemetry:
   default:
-envoy-metrics:
+envoy-metric:
   default:
 #receiver_zipkin:
 #  default: