Force lowercase using label_replace

[thibaut allain]

Hello,

I need to lowercase the hostname of my metrics. 

I would like to use the function label_replace as below. The idea here is to create a new field called "host" that forces the lowercase of the "hostname "field. Is it possible to use the regex (here "[[LOWER]]") to do this ? 

sum without (hostname) (label_replace(up{instance="x.x.x.x:9100"}  * on (instance) group_left(hostname) sophosav_linux_started, "host", "${1}", "hostname", "[[LOWER]]"))

Thanks for your answer

[Brian Candler]

AFAIK this isn't possible.  The things you *can* do with label_replace are given here:

https://prometheus.io/docs/prometheus/latest/querying/functions/#label_replace

The replacement value is just a string which can have $1, $2 etc in it.

[Julius Volz]

In case the proposed "template" relabeling action in https://github.com/prometheus/prometheus/issues/9637#issuecomment-970327987 makes it into Prometheus, it's conceivable that there could be various functions that are made available to the template code that could e.g. include lower-casing.

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Julius Volz

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