diff -r b21e3a747501 -r 101ae8bbfa02 mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Tue Oct 15 09:48:27 2019 -0400
+++ b/mercurial/debugcommands.py	Tue Oct 15 11:06:04 2019 -0400
@@ -950,7 +950,7 @@
 
     remoterevs, _checkout = hg.addbranchrevs(repo, remote, branches, revs=None)
     localrevs = opts[b'rev']
-    with util.timedcm(b'debug-discovery') as t:
+    with util.timedcm('debug-discovery') as t:
         common, hds = doit(localrevs, remoterevs)
 
     # compute all statistics