Populating nested Grafana template variables

[andrew....@gmail.com]

Hi

I have servers divided into groups (development, production, etc.). I have assigned a corresponding 'group' label to my Prometheus time series.

I can easily populate a 'group' drop-down in Grafana by using the query 'label_values(group)', but to get a drop-down of servers belonging to that group I have use a query like 'query_result(node_time{group="$group"})' with a regex of '.*instance="([^"]*)".*'.

Is this the correct approach, or am I missing a more obvious solution?

Regards
Andrew

[Tobias Schmidt]

I'm not aware of a better solution in Grafana. Dynamic datasource selection has been added recently and would benefit from some more improvements. I'd recommend creating an issue on the Grafana repo to make that easier.

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[Bryce Walter]

You would need to set up template variables and have Group as the variable LABEL; then put in your query within the variable settings.

[Yosef Yudilevich]

amm

please can you put example?

its hard to understand and i need it to a big time

so  say i have

$group   label_values(my_group)

which will give fist drop down

and now i want all the instances in that group in second dropdown

so how to do it?

thanks

[Yosef Yudilevich]

ok i got it

$my_os

label_values(os)

$machines

label_values({os="$my_os"},instance)