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[Sean Dague <sean@xxxxxxxxx>]

Long incomplete bug, marking as Opinion. It might be valid, but it's not
anything actionable.

** Changed in: nova
       Status: Incomplete => Invalid

** Changed in: nova
       Status: Invalid => Opinion

** Changed in: nova
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1224921

Title:
  notification.info_from_instance should use get()

Status in OpenStack Compute (Nova):
  Opinion

Bug description:
  notification.info_from_instance() reads many values from the instance
  structure, including capacity vales that are populated from the
  instance_system_metadata table.  However there are cases where these
  values are not present - for example if a deleted instance is passed
  in then the DB queries do not always do the joins.  This results in a
  KeyError exception.

  Whilst such cases are triggered by bugs the notification code should
  be more robust and use .get() methods instead.

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