* The .background-size() LESS mixin, deprecated in 1.27, has been removed.
* ReadOnlyMode::clearCache() and ConfiguredReadOnlyMode::clearCache() have been
removed. Use MediaWikiTestCase::overrideMwServices() instead.
+* Support for the 'aggregator' option of JobQueue (and thus $wgJobTypeConf) was
+ removed. The JobQueueAggregator interface and JobQueueAggregatorRedis class
+ have also been removed. They were experimentally developed for use by the
+ Wikimedia Foundation, but were never used, with no known use cases. (Note that
+ this does not affect JobQueueRedis which is still supported.)
=== Deprecations in 1.33 ===
* The configuration option $wgUseESI has been deprecated, and is expected