diff -r a65c4715fb5d -r 34a46d48d24e mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Fri Sep 06 08:32:48 2019 +0900
+++ b/mercurial/debugcommands.py	Sun Oct 14 13:19:24 2018 +0200
@@ -1766,6 +1766,7 @@
                 repo.obsstore.create(tr, prec, succs, opts['flags'],
                                      parents=parents, date=date,
                                      metadata=metadata, ui=ui)
+                repo.ui.status(('1 new obsolescence markers\n'))
                 tr.close()
             except ValueError as exc:
                 raise error.Abort(_('bad obsmarker input: %s') %