diff --git a/common/extension/event_dispatcher.go b/common/extension/event_dispatcher.go
index 3f7fcee17cddcdc5427baf9c095483e264e3973f..2d33528259e85f50a0784aceba37ecd87be61620 100644
--- a/common/extension/event_dispatcher.go
+++ b/common/extension/event_dispatcher.go
@@ -22,9 +22,10 @@ import (
 	"github.com/apache/dubbo-go/common/observer"
 )
 
-var globalEventDispatcher observer.EventDispatcher
-
-var initEventListeners []observer.EventListener
+var (
+	globalEventDispatcher observer.EventDispatcher
+	initEventListeners    []observer.EventListener
+)
 
 var (
 	dispatchers = make(map[string]func() observer.EventDispatcher, 8)
diff --git a/config/metadata_report_config_test.go b/config/metadata_report_config_test.go
index d6b08d5fb0c51495940d4dc021a0796c1d577923..635feecc2d433366534566d184e058eb54a881ed 100644
--- a/config/metadata_report_config_test.go
+++ b/config/metadata_report_config_test.go
@@ -1,3 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package config
 
 import "testing"
diff --git a/metadata/identifier/subscribe_metadata_identifier.go b/metadata/identifier/subscribe_metadata_identifier.go
index fd3a290b41e870674366943e12a396c3dae7e238..321a216a3e3ad3f2390ab832782924a81e226160 100644
--- a/metadata/identifier/subscribe_metadata_identifier.go
+++ b/metadata/identifier/subscribe_metadata_identifier.go
@@ -1,3 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package identifier
 
 type SubscriberMetadataIdentifier struct {