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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