--- a/cubicweb/server/__init__.py	Tue Jul 30 14:47:25 2019 +0200
+++ b/cubicweb/server/__init__.py	Wed Jul 24 15:28:11 2019 +0200
@@ -63,8 +63,6 @@
 DBG_SQL = 2
 #: repository events
 DBG_REPO = 4
-#: multi-sources
-DBG_MS = 8
 #: hooks
 DBG_HOOKS = 16
 #: operations
@@ -74,7 +72,7 @@
 #: more verbosity
 DBG_MORE = 128
 #: all level enabled
-DBG_ALL = DBG_RQL + DBG_SQL + DBG_REPO + DBG_MS + DBG_HOOKS + DBG_OPS + DBG_SEC + DBG_MORE
+DBG_ALL = DBG_RQL + DBG_SQL + DBG_REPO + DBG_HOOKS + DBG_OPS + DBG_SEC + DBG_MORE
 
 _SECURITY_ITEMS = []
 _SECURITY_CAPS = ['read', 'add', 'update', 'delete', 'transition']

--- a/doc/book/annexes/rql/debugging.rst	Tue Jul 30 14:47:25 2019 +0200
+++ b/doc/book/annexes/rql/debugging.rst	Wed Jul 24 15:28:11 2019 +0200
@@ -14,7 +14,6 @@
 .. autodata:: cubicweb.server.DBG_RQL
 .. autodata:: cubicweb.server.DBG_SQL
 .. autodata:: cubicweb.server.DBG_REPO
-.. autodata:: cubicweb.server.DBG_MS
 .. autodata:: cubicweb.server.DBG_HOOKS
 .. autodata:: cubicweb.server.DBG_OPS
 .. autodata:: cubicweb.server.DBG_MORE

--- a/doc/changes/3.27.rst	Tue Jul 30 14:47:25 2019 +0200
+++ b/doc/changes/3.27.rst	Wed Jul 24 15:28:11 2019 +0200
@@ -46,6 +46,8 @@
 * All "cubicweb-ctl" command only accept one instance argument from now one
   (instead of 0 to n)
 
+* DBG_MS flag has been removed since it is not used anymore
+
 Deprecated code drops
 ---------------------