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The message at the end of this email is some three months old. I have 
the same problem. The question is: *How to use the new rate metrics in 
Gnocchi. *I am using a Stein Devstack for my tests.*
*

For example, I need the CPU rate, formerly named /cpu_util/. I created a 
new archive policy that uses /rate:mean/ aggregation and has a 1 minute 
granularity:

$ gnocchi archive-policy show ceilometer-medium-rate
+---------------------+------------------------------------------------------------------+
| Field               | Value |
+---------------------+------------------------------------------------------------------+
| aggregation_methods | rate:mean, 
mean                                                  |
| back_window         | 0 |
| definition          | - points: 10080, granularity: 0:01:00, timespan: 
7 days, 0:00:00 |
| name                | ceilometer-medium-rate |
+---------------------+------------------------------------------------------------------+

I added the new policy to the publishers in /pipeline.yaml/:

$ tail -n5 /etc/ceilometer/pipeline.yaml
sinks:
     - name: meter_sink
       publishers:
           - gnocchi://?archive_policy=medium&filter_project=gnocchi_swift
*- 
gnocchi://?archive_policy=ceilometer-medium-rate&filter_project=gnocchi_swift*

After restarting all of Ceilometer, my hope was that the CPU rate would 
magically appear in the metric list. But no: All metrics are linked to 
archive policy /medium/, and looking at the details of an instance, I 
don't detect anything rate-related:

$ gnocchi resource show ae3659d6-8998-44ae-a494-5248adbebe11
+-----------------------+---------------------------------------------------------------------+
| Field                 | Value |
+-----------------------+---------------------------------------------------------------------+
...
| metrics               | compute.instance.booting.time: 
76fac1f5-962e-4ff2-8790-1f497c99c17d |
|                       | cpu: 
af930d9a-a218-4230-b729-fee7e3796944                           |
|                       | disk.ephemeral.size: 
0e838da3-f78f-46bf-aefb-aeddf5ff3a80           |
|                       | disk.root.size: 
5b971bbf-e0de-4e23-ba50-a4a9bf7dfe6e                |
|                       | memory.resident: 
09efd98d-c848-4379-ad89-f46ec526c183               |
|                       | memory.swap.in: 
1bb4bb3c-e40a-4810-997a-295b2fe2d5eb                |
|                       | memory.swap.out: 
4d012697-1d89-4794-af29-61c01c925bb4               |
|                       | memory.usage: 
93eab625-0def-4780-9310-eceff46aab7b                  |
|                       | memory: 
ea8f2152-09bd-4aac-bea5-fa8d4e72bbb1                        |
|                       | vcpus: 
e1c5acaf-1b10-4d34-98b5-3ad16de57a98                         |
| original_resource_id  | ae3659d6-8998-44ae-a494-5248adbebe11 |
...

| type                  | instance |
| user_id               | a9c935f52e5540fc9befae7f91b4b3ae |
+-----------------------+---------------------------------------------------------------------+

Obviously, I am missing something. Where is the missing link? What do I 
have to do to get CPU usage rates? Do I have to create metrics? Do//I 
have to ask Ceilometer to create metrics? How?

Right now, no instructions seem to exist at all. If that is correct, I 
would be happy to write documentation once I understand how it works.

Thanks a lot.

Bernd

On 5/10/2019 3:49 PM, info at dantalion.nl wrote:
> Hello,
>
> I am working on Watcher and we are currently changing how metrics are
> retrieved from different datasources such as Monasca or Gnocchi. Because
> of this major overhaul I would like to validate that everything is
> working correctly.
>
> Almost all of the optimization strategies in Watcher require the cpu
> utilization of an instance as metric but with newer versions of
> Ceilometer this has become unavailable.
>
> On IRC I received the information that Gnocchi could be used to
> configure an aggregate and this aggregate would then report cpu
> utilization, however, I have been unable to find documentation on how to
> achieve this.
>
> I was also notified that cpu_util is something that could be computed
> from other metrics. When reading
> https://docs.openstack.org/ceilometer/rocky/admin/telemetry-measurements.html#openstack-compute
> the documentation seems to agree on this as it states that cpu_util is
> measured by using a 'rate of change' transformer. But I have not been
> able to find how this can be computed.
>
> I was hoping someone could spare the time to provide documentation or
> information on how this currently is best achieved.
>
> Kind Regards,
> Corne Lukken (Dantali0n)
>
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