Passing regexes to prometheus query via grafana variables

Question

I'm trying to pass custom variables to prometheus via grafana variables.

The values I've got setup in grafana are as follows:

.+ (as a custom All variable)
eu.+
us.+

The variables are used in a query such as:

some_metric{availability_zone=~"$az", ...}

The All variable works as expected, and the raw eu-.+ values etc when put directly into the query also work fine - but when the variable is assigned via a dropdown, no metrics are returned. eg:

some_metric{availability_zone=~"eu.+", ...}

..correctly matches all metrics with labels such as availability_zone="eu-west-1"

I've tried escaping and without in the custom values, but in for both of the custom values no metrics are returned.

What is wrong here?

devzero · Accepted Answer · 2020-05-26 12:54:10Z

6

The way to do this seems to be:

some_metric{availability_zone=~"${az:pipe}", ...}

The two "gotchas" being that you need regex comparison "=~" and the ${variable:pipe} to get the regex to run.

answered May 26, 2020 at 12:54

devzero

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2 Comments

smaiakov Over a year ago

are you sure that you can apply regex to variables using ":" ?

Vox Over a year ago

=~"${variable:pipe}" instead of using ":", ref @smaiakov

Oliver · Accepted Answer · 2019-11-08 15:18:53Z

0

To make PromQL use regular expressions when matching labels, you have to use =~ instead of =.

Your query should look something like this:

some_metric{availability_zone=~"$az", ...}

answered Nov 8, 2019 at 15:18

Oliver

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1 Comment

danp Over a year ago

thanks for the answer - am already doing that, I'll update the example query.

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