PromQL - Absenth - labels

[fiala...@gmail.com]

Hi,

I have cpu usage exporter with these metrics for every running processes.

process_cpu_usage{command="/usr/bin/rsyslog -n"} 0.12

I would like to use this exporter for monitoring if process is running.

I've tried to use absent -  but with regexp match it doesn't return "command" label. And I need it for alert description

Eg: 

absent(process_cpu_usage{command=~"/usr/sbin/rsyslogd.*", instance="my-server.com"})

Is there a way how to add label to vector(0)?

Or do you know any other way, how to solve it?

Thank you.

[Matt Doughty]

Absent doesn't return labels because there aren't any. Add the labels you need for the alert identification in the labels section.

--Matt

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[fiala...@gmail.com]

I wanted to make this alert with lots of processes.

Eg.: absent(process_cpu_usage{command=~"/usr/sbin/rsyslogd.*") or absent(process_cpu_usage{command=~"/usr/sbin/mysql") or absent(....)

[Matt Doughty]

Absent doesn't work that way. It just tells you that there are no timeseries that match. As a result, when it fires there are no labels to give back to you.

If you make a broad regex, the alert won't fire unless there are no matches at all. For that reason, you will need a discrete alert for every process you want to monitor.

--Matt

To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/08bd910d-d8ad-47af-a273-b0b6a5f8260dn%40googlegroups.com.

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--Matt