List queued Jenkins jobs

list_queued_jobs.Jenkinsfile

// vim: set filetype=groovy:

pipeline {
    agent any
    stages { stage('Hello') { steps { script {
        // `Jenkins` comes from `jenkins.model.Jenkins`.
        Jenkins.get().queue.items.findAll { it.task instanceof org.jenkinsci.plugins.workflow.support.steps.ExecutorStepExecution.PlaceholderTask } .each { println("${it.task.runId} ${it.task.label}") }
    }}}}
}