diff --git a/rhodecode/lib/vcs/backends/hg/repository.py b/rhodecode/lib/vcs/backends/hg/repository.py
--- a/rhodecode/lib/vcs/backends/hg/repository.py
+++ b/rhodecode/lib/vcs/backends/hg/repository.py
@@ -35,6 +35,7 @@ from rhodecode.lib.datelib import (
 from rhodecode.lib.str_utils import safe_str
 from rhodecode.lib.utils2 import CachedProperty
 from rhodecode.lib.vcs import connection, exceptions
+from rhodecode.lib.vcs.conf import settings as vcs_settings
 from rhodecode.lib.vcs.backends.base import (
     BaseRepository, CollectionGenerator, Config, MergeResponse,
     MergeFailureReason, Reference, BasePathPermissionChecker)
@@ -722,7 +723,12 @@ class MercurialRepository(BaseRepository
         commit needs to be pushed.
         """
         self._update(source_ref.commit_id)
-        message = close_message or f"Closing branch: `{source_ref.name}`"
+        message = (close_message or vcs_settings.HG_CLOSE_BRANCH_MESSAGE_TMPL).format(
+            user_name=user_name,
+            user_email=user_email,
+            target_ref_name=target_ref.name,
+            source_ref_name=source_ref.name
+        )
         try:
             self._remote.commit(
                 message=safe_str(message),
diff --git a/rhodecode/lib/vcs/conf/settings.py b/rhodecode/lib/vcs/conf/settings.py
--- a/rhodecode/lib/vcs/conf/settings.py
+++ b/rhodecode/lib/vcs/conf/settings.py
@@ -58,6 +58,9 @@ MERGE_MESSAGE_TMPL = (
 MERGE_DRY_RUN_MESSAGE = 'dry_run_merge_message_from_rhodecode'
 MERGE_DRY_RUN_USER = 'Dry-Run User'
 MERGE_DRY_RUN_EMAIL = 'dry-run-merge@rhodecode.com'
+HG_CLOSE_BRANCH_MESSAGE_TMPL = (
+    'Closing branch: `{source_ref_name}`'
+)
 
 
 def available_aliases():