make format

Signed-off-by: Kosuke Morimoto <[email protected]>

internal/observability/observability.go

@@ -1,16 +1,18 @@
+//
 // Copyright (C) 2019-2023 vdaas.org vald team <[email protected]>
 //
 // 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 (