Hello,
can someone please help me to understand why "max_over_time" ist not
working as I expect it to work?
Why do I see a correct peak using
max_over_time(metric{}[1h:15s])
but if I run this command the peak is lower than with the other command
before?
max_over_time(metric{}[24h:15s])
PS:
[15s:15s] from the first post was wrong - I used 1h:15s and wanted to
clarify that the selected steps match the scrape interval.
Regards
Alexander Wilke schrieb am Mittwoch, 28. August 2024 um 21:36:48 UTC+2:
> Hello,
>
> I have some metrics of network devices. I want to know the highest values
> of these metrics in the last X hours which was higher than a specific
> threshold.
>
> Ideally I would like to see the value and the timestamp. Sometimes I would
> like to see the highest value of the last 24hrs and sometimes the highest
> three values of the last 24hrs or the last month or year.
>
> I would like to see this in a table.
>
> I tried something lke that from node exporter in Grafana
>
> topk(3,
> max_over_time(node_disk_io_now{device=~"dm-0", instance="ubiquiti",
> job="node_exporter"}[15s:15s]) > 10
> )
>
>
> However first problem if the max value is e.g. 22 and it appears several
> times within the timerange I see this displayxed several times. I would
> like to idealle see the most recent ones - thats why I though "topk(3,)"
> would help but it does not seem to work as I would expect.
>
> second thing is that if I run this query over a timerange of 3hrs I get
> really the maximum values. If I use a timerange of 3days or 3 weeks then I
> do get different values and the peaks which should appear do not appear
> anymore. Why is max_over_time not displaying these values anymore? I used
> [15s:15s] because my scrape_interval is 15s.
>
> another thing is I do not know how to get the timestamp of the last
> occurence
>
>
> Would really appreciate any help why "max_over_time" is not working as I
> expect it to work and how to optimize the query to answer my questions.
>
>
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