--- a/mercurial/setdiscovery.py	Wed Jun 07 10:29:39 2017 +0100
+++ b/mercurial/setdiscovery.py	Wed Jun 07 10:44:11 2017 +0100
@@ -241,6 +241,9 @@
     elapsed = util.timer() - start
     ui.progress(_('searching'), None)
     ui.debug("%d total queries in %.4fs\n" % (roundtrips, elapsed))
+    msg = 'found %d common and %d missing heads, %d roundtrips in %.4fs\n'
+    ui.log('discovery', msg, len(result), len(srvheadhashes), roundtrips,
+           elapsed)
 
     if not result and srvheadhashes != [nullid]:
         if abortwhenunrelated: