[ovirt-devel] [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs

[Yaniv Dary]

This is about accumulative values, I'm also asking about stats like CPU
usage of the VM\Host that is not reported in absolute value.
Can you bump the thread?

Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109

Tel : +972 (9) 7692306
        8272306
Email: ydary at redhat.com
IRC : ydary


On Mon, Feb 27, 2017 at 10:11 AM, Francesco Romani <fromani at redhat.com>
wrote:

>
> On 02/26/2017 03:13 PM, Yaniv Dary wrote:
>
>
> 2. collectd *intentionally* report metrics as rates, not as absolute
>> values as Vdsm does. This may be one issue in presence of restarts/data
>> loss in the link between collectd and the metrics store.
>>
>>
>> How does this work?
>> If we want to show memory usage over time for example, we need to have
>> the usage, not the rate.
>> How would this be reported?
>>
>>
>> I was imprecise, my fault.
>>
>> Let me retry:
>> collectd intentionally report quite a lot of metrics we care about as
>> rates, not as absolute values.
>> Memory is actually ok fine.
>>
>>   a0/virt/disk_octets-hdc -> rate
>>   a0/virt/disk_octets-vda
>>   a0/virt/disk_ops-hdc -> rate
>>   a0/virt/disk_ops-vda
>>   a0/virt/disk_time-hdc -> rate
>>   a0/virt/disk_time-vda
>>   a0/virt/if_dropped-vnet0 -> rate
>>   a0/virt/if_errors-vnet0 -> rate
>>   a0/virt/if_octets-vnet0 -> rate
>>   a0/virt/if_packets-vnet0 -> rate
>>   a0/virt/memory-actual_balloon -> absolute
>>   a0/virt/memory-rss -> absolute
>>   a0/virt/memory-total -> absolute
>>   a0/virt/ps_cputime -> rate
>>   a0/virt/total_requests-flush-hdc ->  rate
>>   a0/virt/total_requests-flush-vda
>>   a0/virt/total_time_in_ms-flush-hdc -> rate
>>   a0/virt/total_time_in_ms-flush-vda
>>   a0/virt/virt_cpu_total -> rate
>>   a0/virt/virt_vcpu-0 -> rate
>>   a0/virt/virt_vcpu-1
>>
>> collectd "just" reports the changes since the last sampling. I'm not sure
>> which is the best way to handle that; I've sent a mail to collectd list
>> some time ago, no answer so far.
>>
>
> Can you CC on that thread?
> I don't know how ES would work with rates at all.
> I want to be able to show CPU usage over time and I need to know if its
> 80% or 10%.
>
>
> Thanks to the awkward gmail interface I can't reply to myself and CC other
> people, but I can share the link:
>
> https://mailman.verplant.org/pipermail/collectd/2017-January/006965.html
>
> --
> Francesco Romani
> Red Hat Engineering Virtualization R & D
> IRC: fromani
>
>
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