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(This reply might be exceed the limit of comment, so I reply here.) Yes!! It is fresh, and I have launched two instances for several hours, but the meter "cpu_util" does not show up. Actually I reset the devstack by remove

EXTRA_OPTS=(notification_driver=nova.openstack.common.notifier.rabbit_notifier,ceilometer.compute.nova_notifier)

in localrc and add

notification_driver=nova.openstack.common.notifier.rabbit_notifier
notification_driver=ceilometer.compute.nova_notifier

in the nova configure meta-section of local.conf.

The nova.conf turns out to look like this

notification_driver = ceilometer.compute.nova_notifier
notify_on_state_change = vm_and_task_state
instance_usage_audit_period = hour
instance_usage_audit = True

Then I can see some of meters of nova show up, like "cpu", "desk.*"...(The first time, I get no meters of nova). But I think the problem might be the missing of another notification driver

notification_driver = nova.openstack.common.notifier.rabbit_notifier

so I add it to the nova.conf by myself and execute ./rejoin_stack.sh.

Unfortunately, the "cpu_util" does not show up in the meter list still, after I launched several instances for more than half hours.

Any help is much appreciated. Thanks.