diff -r 40739aef97f7 -r db6b666ce1e6 mercurial/cmdutil.py
--- a/mercurial/cmdutil.py	Thu Aug 03 15:30:41 2017 +0200
+++ b/mercurial/cmdutil.py	Thu Aug 03 15:31:54 2017 +0200
@@ -1687,7 +1687,7 @@
             # i18n: column positioning for "hg log"
             instabilities = ctx.instabilities()
             self.ui.write(_("instability: %s\n") % ', '.join(instabilities),
-                          label='log.trouble')
+                          label='log.instability')
 
         self._exthook(ctx)