Comment 6 for bug 1824315

Found this on http://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/periodic-tripleo-ci-fedora-28-standalone-master/36994ee/logs/undercloud/var/log/containers/nova/nova-api.log.txt.gz:

2019-04-16 07:16:09.070 20 INFO nova.compute.api [req-83e26ba8-f8ac-4b9b-9608-3c2aa7e9672d abaf4efd50ed493db1a49ce33d44717a 59ede4886038422f9d6c0cd324db4545 - default default] [instance: 3e7e8f96-9bb0-4d7f-b394-14bd3fb4ca17] Skipping quiescing instance: QEMU guest agent is not enabled
Traceback (most recent call last):

  File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/server.py", line 229, in inner
    return func(*args, **kwargs)

  File "/usr/lib/python3.6/site-packages/nova/exception_wrapper.py", line 79, in wrapped
    function_name, call_dict, binary, tb)

  File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    self.force_reraise()

  File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    six.reraise(self.type_, self.value, self.tb)

  File "/usr/lib/python3.6/site-packages/six.py", line 693, in reraise
    raise value

  File "/usr/lib/python3.6/site-packages/nova/exception_wrapper.py", line 69, in wrapped
    return f(self, context, *args, **kw)

  File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 8491, in quiesce_instance
    self.driver.quiesce(context, instance, image_meta)

  File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 2202, in quiesce
    self._set_quiesced(context, instance, image_meta, True)

  File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 2181, in _set_quiesced
    self._can_quiesce(instance, image_meta)

  File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 2175, in _can_quiesce
    raise exception.QemuGuestAgentNotEnabled()

nova.exception.QemuGuestAgentNotEnabled: QEMU guest agent is not enabled