code: public com.google.protobuf.Duration getCoolDownPeriod() {
      return coolDownPeriod_ == null ? com.google.protobuf.Duration.getDefaultInstance() : coolDownPeriod_;
    }
docs: <pre>
  Amount of time that the
  [Autoscaler](https://cloud.google.com/compute/docs/autoscaler/)
  should wait between changes to the number of virtual machines.
  Only applicable for VM runtimes.
  </pre>
  
  <code>.google.protobuf.Duration cool_down_period = 1;</code>