Open Stack

Thinking about my favorite use case for lifecycle plug points for cloud 
providers (i.e., giving something a chance to make a holistic placement 
decision), it occurs to me that one more is needed: a scale-down plug 
point.  A plugin for this point has a distinctive job: to decide which 
group member(s) to remove from a scaling group (i.e., 
OS::Heat::AutoScalingGroup or OS::Heat::InstanceGroup or 
OS::Heat::ResourceGroup or AWS::AutoScaling::AutoScalingGroup).  The 
plugin's signature could be something like this: given a list of group 
members and a number to remove, return the list of members to remove (or, 
equivalently, return the list of members to keep).  What do you think?

Thanks,
Mike
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