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How can I group labels in a Prometheus request?

If I have a metric with the following labels:

my_metric{group="group a"}  100
my_metric{group="group b"}  100
my_metric{group="group c"}  100
my_metric{group="misc group a"}  1
my_metric{group="misc group b"}  2
my_metric{group="misc group c"}  1
my_metric{group="misc group d"}  1

Is it possible to execute a query or even label_replace

one that ties the "misc" groups together?

(I understand that the performance of the metric needs to be improved and I updated the application to fix it. However, this left me with this question if I wanted to fix the metrics via query later)

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2 answers


Yes, you can use tag swap to group all misc together:

sum by (new_group) (
  label_replace(
    label_replace(my_metric, "new_group", "$1", "group", ".+"),
    "new_group", "misc", "group", "misc group.+"
  )
)


The inner label_replace copies all values ​​from the group to new_group, the outer one overwrites those that match "misc group. +" With "misc", and then we sum over label "new_group". The reason for using the new label is because the series is no longer unique if we just overwrite the "group" label and the sum doesn't work.

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You can use regex query:

my_metric{group=~"misc group.+"}


This will give you everything where group

the "misc group" starts.

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