* $wgPreloadJavaScriptMwUtil was removed (deprecated in 1.26).
Extensions, skins, gadgets and scripts that use the mediawiki.util module must
express a dependency on it.
+* $wgIncludeLegacyJavaScript, deprecated in MediaWiki 1.26, now defaults false.
+ Extensions, skins, gadgets and scripts that need the mediawiki.legacy.wikibits
+ module should express a dependency on it.
=== New features in 1.27 ===
* $wgDataCenterUpdateStickTTL was also added. This decides how long a user
be a good idea, but will log out all current sessions.
* $wgEventRelayerConfig was added, for managing PubSub event relay configuration,
specifically for reliable CDN url purges.
+* Requests have unique IDs, equal to the UNIQUE_ID environment variable (when
+ MediaWiki is behind Apache+mod_unique_id or something similar) or a randomly-
+ generated 24-character string. This request ID is used to annotate log records
+ and error messages. It is available client-side via mw.config.get( 'wgRequestId' ).
+ The request ID supplants exception IDs. Accordingly, MWExceptionHandler::getLogId()
+ is deprecated.
=== External library changes in 1.27 ===
* OutputPage::getScript() was removed (deprecated since 1.24).
* OutputPage::out() was removed (deprecated since 1.22).
* OutputPage::setAllowedModules() was removed (deprecated since 1.24).
+* UserrightsPage::makeGroupNameListForLog() was removed (deprecated since 1.21).
=== Languages updated in 1.27 ===