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<div class="moz-cite-prefix">On 02/26/2017 03:13 PM, Yaniv Dary
wrote:<br>
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#ccc solid;padding-left:1ex"> 2.
collectd *intentionally* report metrics
as rates, not as absolute<br>
values as Vdsm does. This may be one
issue in presence of restarts/data<br>
loss in the link between collectd and
the metrics store.<br>
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<div dir="auto">How does this work? </div>
<div dir="auto">If we want to show memory usage
over time for example, we need to have the
usage, not the rate. </div>
<div dir="auto">How would this be reported? <br>
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I was imprecise, my fault.<br>
<br>
Let me retry:<br>
collectd intentionally report quite a lot of metrics we
care about as rates, not as absolute values.<br>
Memory is actually ok fine.<br>
<br>
a0/virt/disk_octets-hdc -> rate<br>
a0/virt/disk_octets-vda<br>
a0/virt/disk_ops-hdc -> rate<br>
a0/virt/disk_ops-vda<br>
a0/virt/disk_time-hdc -> rate<br>
a0/virt/disk_time-vda<br>
a0/virt/if_dropped-vnet0 -> rate<br>
a0/virt/if_errors-vnet0 -> rate<br>
a0/virt/if_octets-vnet0 -> rate<br>
a0/virt/if_packets-vnet0 -> rate<br>
a0/virt/memory-actual_balloon -> absolute<br>
a0/virt/memory-rss -> absolute<br>
a0/virt/memory-total -> absolute<br>
a0/virt/ps_cputime -> rate<br>
a0/virt/total_requests-flush-<wbr>hdc -> rate<br>
a0/virt/total_requests-flush-<wbr>vda<br>
a0/virt/total_time_in_ms-<wbr>flush-hdc -> rate<br>
a0/virt/total_time_in_ms-<wbr>flush-vda<br>
a0/virt/virt_cpu_total -> rate<br>
a0/virt/virt_vcpu-0 -> rate<br>
a0/virt/virt_vcpu-1<br>
<br>
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.</div>
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<div>Can you CC on that thread?</div>
<div>I don't know how ES would work with rates at all. </div>
<div>I want to be able to show CPU usage over time and I
need to know if its 80% or 10%.</div>
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Thanks to the awkward gmail interface I can't reply to myself and CC
other people, but I can share the link:<br>
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<a class="moz-txt-link-freetext" href="https://mailman.verplant.org/pipermail/collectd/2017-January/006965.html">https://mailman.verplant.org/pipermail/collectd/2017-January/006965.html</a><br>
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<pre class="moz-signature" cols="72">--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani</pre>
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