As part of a bug fix , the internal
ComputeVirtAPI.wait_for_instance_event interface is changing to no
longer accept event names that are strings, and will now require the
(name, tag) tuple form which all of the in-tree virt drivers are already
If you have an out of tree driver that uses this interface, heads up
that you'll need to be using the tuple form if you are not already doing so.
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