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 ====
* 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.
== Compatibility ==