* $wgRateLimitLog was removed; use $wgDebugLogGroups['ratelimit'] instead.
* Deprecated API formats dbg, txt, and yaml have been removed.
* CLDRPluralRule* classes have been replaced with wikimedia/cldr-plural-rule-parser.
+* Removed $wgProfilePerHost, $wgUDPProfilerHost, $wgUDPProfilerPort,
+ $wgUDPProfilerFormatString, $wgStatsMethod, $wgAggregateStatsID, $wgStatsFormatString,
+ and $wgProfileCallTree (deprecated since 1.20).
+* For proper operation of LocalIdLookup with shared user tables, ensure that
+ $wgSharedDB and $wgSharedTables are properly set even on the "central" wiki
+ that all others are sharing from and that $wgLocalDatabases is set to the
+ full list of sharing wikis on all those wikis.
=== New features in 1.27 ===
* $wgDataCenterId and $wgDataCenterRoles where added, which will serve as
* Added CentralIdLookup, a service that allows extensions needing a concept of
"central" users to get that without having to know about specific central
authentication extensions.
+* $wgMaxUserDBWriteDuration added to limit huge user-generated transactions.
+ Regular web request transactions that takes longer than this are aborted.
+* Added a new hook, 'TitleMoveCompleting', which runs before a page move is committed.
+* $wgCdnReboundPurgeDelay was added to provide secondary delayed purges of URLs
+ from CDN to mitigate DB replication lag and WAN cache purge lag.
=== External library changes in 1.27 ===
==== Upgraded external libraries ====
the text before diffing it.
* Deprecated formats dbg, txt, and yaml have been removed.
* (T47988) The protect log event details now use new-style formatting.
+* The following response properties from action=login are deprecated, and may
+ be removed in the future: lgtoken, cookieprefix, sessionid. Clients should
+ handle cookies to properly manage session state.
=== Action API internal changes in 1.27 ===
* ApiQueryORM removed.
* ResourceLoader::getLessCompiler() now takes an optional parameter of
additional LESS variables to set for the compiler.
* wfBaseConvert() marked as deprecated, use Wikimedia\base_convert() directly instead.
+* Obsolete maintenance scripts clearCacheStats.php and showCacheStats.php
+ were removed. The underlying data is sent to StatsD (see $wgStatsdServer).
+* Removed msg_resource_links database table and associated code.
+* Removed msg_resource database table and associated code.
+* Skin::getNamespaceNotice() was removed.
+* wfIsConfiguredProxy() was removed (deprecated since 1.24).
+* wfDebugTimer() was removed (deprecated since 1.25).
+* wfIsTrustedProxy() was removed (deprecated since 1.24).
+* wfGetIP() was removed (deprecated since 1.19).
+* MWHookException was removed.
+* OutputPage::appendSubtitle() was removed (deprecated since 1.19).
+* OutputPage::loginToUse() was removed (deprecated since 1.19).
== Compatibility ==