lint

Signed-off-by: Ben Ye <[email protected]>

Author: yeya24

pkg/storage/tsdb/multilevel_cache.go

@@ -2,13 +2,14 @@ package tsdb
 
 import (
 	"context"
+	"sync"
+
 	"github.com/oklog/ulid"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prometheus/prometheus/model/labels"
 	"github.com/prometheus/prometheus/storage"
 	storecache "github.com/thanos-io/thanos/pkg/store/cache"
-	"sync"
 )
 
 const (