--- a/hgext/remotefilelog/shallowutil.py	Sat Oct 13 05:09:18 2018 +0300
+++ b/hgext/remotefilelog/shallowutil.py	Tue Nov 13 17:41:26 2018 +0300
@@ -105,7 +105,7 @@
 def reportpackmetrics(ui, prefix, *stores):
     dicts = [s.getmetrics() for s in stores]
     dict = prefixkeys(sumdicts(*dicts), prefix + '_')
-    ui.log(prefix + "_packsizes", "", **dict)
+    ui.log(prefix + "_packsizes", "", **pycompat.strkwargs(dict))
 
 def _parsepackmeta(metabuf):
     """parse datapack meta, bytes (<metadata-list>) -> dict