puppet/modules/time/manifests/init.pp

class time {
  class { '::chrony':
    servers => {
      "ptbtime1.ptb.de"=>["iburst"],
      "ptbtime2.ptb.de"=>["iburst"],
      "ptbtime3.ptb.de"=>["iburst"],
      "ptbtime4.ptb.de"=>["iburst"],
    },
  }
}