refactor: Fix linter errors

service/check.go

@@ -17,8 +17,7 @@ import (
 )
 
 var (
-	httpObserveFailed   = errors.New("http observe fail")
-	httpObserveMaxTries = errors.New("http observe max tries")
+	errHttpObserveFailed = errors.New("http observe fail")
 
 	GlobalCheckService Check
 )
@@ -111,7 +110,12 @@ func (c *check) Observe(ctx context.Context, srv *model.Service) error {
 	return nil
 }
 
-func (c *check) RegisterStatus(ctx context.Context, serviceID uint64, status model.StatusCode, meta ResponseMeta) error {
+func (c *check) RegisterStatus(
+	ctx context.Context,
+	serviceID uint64,
+	status model.StatusCode,
+	meta ResponseMeta,
+) error {
 	return c.statusRepository.Add(ctx, model.Status{
 		ServiceID:    serviceID,
 		Status:       status,
@@ -163,7 +167,7 @@ func (c *check) ObserveHttp(ctx context.Context, service *model.Service) (*Respo
 	}
 
 	if response.StatusCode != http.StatusOK {
-		return meta, httpObserveFailed
+		return meta, errHttpObserveFailed
 	}
 
 	return meta, nil