diff --git a/internal/observability/metrics/mem/mem.go b/internal/observability/metrics/mem/mem.go
index c6d9a26ade3..513e9eeced9 100644
--- a/internal/observability/metrics/mem/mem.go
+++ b/internal/observability/metrics/mem/mem.go
@@ -1,18 +1,16 @@
-//
 // Copyright (C) 2019-2023 vdaas.org vald team <vald@vdaas.org>
 //
 // Licensed 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
 //
-//    https://www.apache.org/licenses/LICENSE-2.0
+//	https://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 mem
 
 import (
diff --git a/internal/observability/observability.go b/internal/observability/observability.go
index b8c0b8b1758..d8d32f9454b 100644
--- a/internal/observability/observability.go
+++ b/internal/observability/observability.go
@@ -1,18 +1,16 @@
-//
 // Copyright (C) 2019-2023 vdaas.org vald team <vald@vdaas.org>
 //
 // Licensed 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
 //
-//    https://www.apache.org/licenses/LICENSE-2.0
+//	https://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 observability
 
 import (