[Bug 1585113] [NEW] scale down delete oldest first

[jz]

Public bug reported:

when heat do autoscaling's scaling down, I see in the code that the policy when resizing and shrinking, the oldest instance will be removed. What's the purpose of that instead of deleting the
newest one

** Affects: heat (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1585113

Title:
  scale down delete oldest first

Status in heat package in Ubuntu:
  New

Bug description:
  when heat do autoscaling's scaling down, I see in the code that the policy when resizing and shrinking, the oldest instance will be removed. What's the purpose of that instead of deleting the
  newest one

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