Use Grafana variable as input parameter for prometheus function

Question

I am trying to create a panel that shows the n'th percentile request time using the Prometheus function histogram_quantile(). I have a text box variable on the Grafana dashboard that the user will enter a floating point value in. I want to use this variable as the input to histogram_quantile

My current query is

histogram_quantile($quantile, 
   sum(rate( request_duration_seconds_bucket[2m])) by (le))

However I get an error" : "1:20: parse error: unexpected character: '$'"

Is it possible to use a grafana variable as input for a prometheus function?

Related to this question, however in the linked question the query appears to be accepted, it is the variable content that cannot be parsed https://stackoverflow.com/questions/51776726/grafana-multivalue-float-histogram-quantile — Trace L, Dec 14 '22 at 20:12

score 1 · Accepted Answer · answered Dec 15 '22 at 00:06

1

Yes, it is possible to use dashboard variable as input for a prometheus function.

You have some error in your case. Blind guess: you have a typo in the variable name, so it is not interpreted - use query inspector to verify that variable was replaced with the correct value.

Try also to save dashboard and then refresh dashboard with browser refresh (F5).

answered Dec 15 '22 at 00:06

Jan Garaj

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I had mistakenly used the variables "Label" value in the query instead of the "Name" – Trace L Dec 15 '22 at 18:51

Use Grafana variable as input parameter for prometheus function

1 Answers1