production.
=== Configuration changes in 1.27 ===
-* Removed $wgUseLinkNamespaceDBFields
+* $wgUseLinkNamespaceDBFields was removed.
* Deprecated $wgResourceLoaderMinifierStatementsOnOwnLine and
$wgResourceLoaderMinifierMaxLineLength, because there was little value in
making the behavior configurable. The default values (`false` for the former,
** A new constructor, User::newSystemUser(), has been added to simplify the
creation of passwordless "system" users for logged actions.
* $wgMaxSquidPurgeTitles was removed.
+* $wgAjaxWatch was removed. This is now enabled by default.
=== New features in 1.27 ===
* $wgDataCenterId and $wgDataCenterRoles where added, which will serve as