For bare metal instances that have local storage, this must be set to true to verify that the local storage will be deleted during the migration. For instances without, this parameter has no effect.
If present, this parameter will set (or reset) the scheduled time that the instance will be reboot migrated in the format defined by RFC3339. This will also change the {@code timeMaintenanceRebootDue} field on the instance.
If not present, the reboot migration will be triggered immediately.
Parameters for the {@code rebootMigrate} {@link #instanceAction(InstanceActionRequest) instanceAction}.