--- a/hgext/remotefilelog/shallowutil.py	Tue Jan 08 10:31:10 2019 -0500
+++ b/hgext/remotefilelog/shallowutil.py	Tue Jan 08 14:48:05 2019 -0800
@@ -106,7 +106,7 @@
 def reportpackmetrics(ui, prefix, *stores):
     dicts = [s.getmetrics() for s in stores]
     dict = prefixkeys(sumdicts(*dicts), prefix + '_')
-    ui.log(prefix + "_packsizes", "", **pycompat.strkwargs(dict))
+    ui.log(prefix + "_packsizes", "\n", **pycompat.strkwargs(dict))
 
 def _parsepackmeta(metabuf):
     """parse datapack meta, bytes (<metadata-list>) -> dict