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On 2/26/2018 9:28 PM, John Griffith wrote:
> I'm also wondering how much of the extend actions we can leverage here, 
> but I haven't looked through all of that yet.​

The os-server-external-events API in nova is generic. We'd just add a 
new microversion to register a new tag for this event. Like the extend 
volume event, the volume ID would be provided as input to the API and 
nova would use that to identify the instance + volume to refresh on the 
compute host.

We'd also register a new instance action / event record so that users 
could poll the os-instance-actions API for completion of the operation.

-- 

Thanks,

Matt