Maximum value of Long running operation duration in prometheus

[TEST TEST]

Hi,

We are logging the duration of some long running operations to prometheus as a histogram metric.

We would like to compute the Longest/shortest running duration of the long running job with specfic date range from the histogram metric.   How can we achieve this using PromQL

[b.ca...@pobox.com]

You can't get the maximum or minimum out of a histogram.  A histogram only counts the number of occurrences within each bucket; it doesn't store the individual values.

You can get an *estimate* of (say) the 1st percentile and 99th percentile values using the histogram_quantile function.

[Ben Kochie]

You could use a subquery to get the max_over_time() of the histogram_quantile(). Warning, computing this could be very expensive, so best to have the quantile saved in a recording rule.

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