nova/releasenotes/notes/per-instance-serial-f2e597cb05d1b09e.yaml

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---
upgrade:
- |
Added a new ``unique`` choice to the ``[libvirt]/sysinfo_serial``
configuration which if set will result in the guest serial number being
set to ``instance.uuid``. This is now the default value
of the ``[libvirt]/sysinfo_serial`` config option and is the recommended
choice since it ensures the guest serial is the same even if the instance
is migrated between hosts.