Manual:$wgJobQueueAggregator

Jobs: $wgJobQueueAggregator
Which aggregator to use for tracking which queues have jobs.
Introduced in version:1.21.0 (Gerrit change 48223; git #d0985f4f)
Removed in version:1.33.0 (Gerrit change 500161; git #196ef348)
Allowed values:(array)
Default value:See below

Details

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From DefaultSettings.php:

Default

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MediaWiki versions:
1.31 – 1.32
/**
 * Which aggregator to use for tracking which queues have jobs.
 * These settings should be global to all wikis.
 */
$wgJobQueueAggregator = [
	'class' => JobQueueAggregatorNull::class
];
MediaWiki versions:
1.21 – 1.30
$wgJobQueueAggregator = [
	'class' => 'JobQueueAggregatorNull'
];