Delete artifacts from Jenkins with Groovy script.

delete_artifacts.groovy

// Delete old artifacts that fills up the disk on the master node.
// Run this from the Jenkins console (Manage Jenkins, Manage Nodes, master, Script Console)

def project = Jenkins.get().getItemByFullName('your-project-id')
def jobs = project.getAllJobs()

def total_size = 0

jobs.each{ job -> 
  def builds = job.getBuilds()
  builds.each{ build -> 
    def artifacts = build.artifacts
    artifacts.each{ artifact ->
      total_size += artifact.getFileSize()
      println "$artifact, ${artifact.getFileSize()}"
    }
    build.deleteArtifacts()
  } 
}

println "Total size: $total_size"