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[Openstack] [gnocchi][aodh] Unable to trigger aggregate alarms

This is on a Newton Packstack.

I try to trigger alarms based on average cpu_util of a group of
instances. *Problem: *The alarm perpetually remains in state
"insufficient data".

Ceilometer is configured to use Gnocchi and the medium archive policy
(which stores data once a minute).  The intervals in pipeline.yaml are
set to 60.

I run two instances with high CPU usage. Both have a metadata item
"metering.server_group=hicpu". The alarm uses a query
"server_group==hicpu", has a granularity of 60 and evalution periods set
to 1. I expect it to be in state /alarm /or /ok /after less than 2 minutes.