Calculate percentage from two metrics

#1

Hi Team,

I am using openTSDB as a data source for Grafana. I have a requirement to calculate the % of memory consume out of total memory.
In the dashboard, A metrics having UsedMemory value, B metrics having TotalMemory value. How to calculate the percentage for these two metrics.

Appreciate the quick help.

Thanks

#2

You have to do that in the query, use the expression api

#3

Hello Torkel,

I am glad that you responded to my query. I am a pretty new to this grafana.

COuld you please tell how to get this Expression API and how to integrate this to my grafana.

Thanks,
Prathap

#4

Not sure it’s supported, maybe via filters? check OpenTSDB docs