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To clarify,

  1. In Openstack, autoscaling get triggered only based on Alarm events generated by Ceilometer.
  2. On autoscaling, only identical virtual machines get launched. One way can be like writing custom script in User-Data to fetch the latest application package can be made possible.

Hence Autoscaling wouldn't be best solution for your usecase, may be you can write custom HEAT template to automate the usecase.