[#373] blobstor: Add metrics

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/blobstor/control.go

@@ -18,6 +18,7 @@ func (b *BlobStor) Open(readOnly bool) error {
 			return err
 		}
 	}
+	b.metrics.SetMode(readOnly)
 	return nil
 }
 
@@ -65,5 +66,8 @@ func (b *BlobStor) Close() error {
 	if firstErr == nil {
 		firstErr = err
 	}
+	if firstErr == nil {
+		b.metrics.Close()
+	}
 	return firstErr
 }