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[telemetry][ceilometer][gnocchi] How to configure aggregate for cpu_util or calculate from metrics


Thanks much, Sumit. I did not detect your reply until now. Still hard to 
manage the openstack-discuss mailing list.

In the mean time, I have made a lot of progress and understand how 
Ceilometer creates its own archive policies and adds resources and their 
metrics to Gnocchi - based on gnocchi_resources.yaml, as you correctly 
remarked.

Thanks to help from the Gnocchi team, I also know how to generate CPU 
utilization figures. See this issue on Github if you are interested: 
https://github.com/gnocchixyz/gnocchi/issues/1044.

My ultimate goal is autoscaling based on CPU utilization. I have not 
solved that problem that, but it's a different question. One question at 
a time!

Thanks again, this immediate question is answered.

Bernd.

On 8/1/2019 8:20 PM, Sumit Jamgade wrote:
> Hey Bernd,
>
> Can you try with just one publisher instead of 2 and also drop the
> archive_policy query parameter and its value.
>
> Then ceilometer should publish metrics based on map defined
> gnocchi_resources.yaml
>
> And while you are at it. Could you post a list of archive policies
> already defined in gnocchi, I believe this list should match what
> is listed in gnocchi_resources.yaml.
>
> Hope that helps
> Sumit
>
>
>
> On 7/31/19 3:22 AM, Bernd Bausch wrote:
>> 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)
>>>
>