Environment
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CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
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CloudBees CI (CloudBees Core) on traditional platforms - Client controller
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CloudBees Jenkins Enterprise - Managed controller
Resolution
The following script run in the Jenkins script console at Manage Jenkins » Script Console does that. Note that you should always make sure to have good backups before deleting things like this in a script.
Jenkins.instance.getItemByFullName("yourJobNameHere").builds.each { def p = it.getAction(hudson.plugins.promoted_builds.PromotedBuildAction) if (!p || !p.hasPromotion()) { it.delete() } } return
Replace "yourJobNameHere" with the name of the job.