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Minimize potential job queue traffic disruption by setting a new mysql mediawiki loadbalancer tag "jobqueue"
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Description

This is an enhancement request. Because of past issues with sudden increase in job queue traffic, such as the parent one, being able to ban job queue traffic from some database servers could be beneficial. We can set them by default on all main db servers, and use it to ban traffic in specific instances.

I asked performance team some time ago and they are ok with this feature existing.