Delete slaves with a certain label directly from Jenkins master script console

delete-slaves.groovy

import hudson.slaves.*
import hudson.model.*
  
  for (aSlave in hudson.model.Hudson.instance.slaves) {
    if (aSlave.name.indexOf("medium-rt-framework") == 0 && !aSlave.getComputer().isOnline()) {
    	aSlave.getComputer().setTemporarilyOffline(true, null)
      	aSlave.getComputer().doDoDelete()
    }
  }