How to subtract two queries in a pie chart

[sipriuspt]

Hello,

I am trying to understand if and how can I subtract two queries with metric data from a zabbix datasource, in a pie chart.

From what I have saw there is a ‘functions’ field on each query mode, and there are two functions available called delta and rate but I dont know if I can do this with that, or if its possible(http://prntscr.com/ji7ywx).

Or if there is a way to represent percentages and not the current value(http://prntscr.com/ji7yjy).

Anyone?

Thanks!

[bjgocraft]

Not 100% sure if this is what you’re trying to do, but maybe this helps:

Disk usage as percentage of used disk

Hi, while researching to achieve the same thing, I stumbled upon this post and want to share my solution: Go into the Transform data tab, press “+ Add transformation” and choose “Add field from calculation”. Choose the Mode “binary operation”. Then create the operation “total data size” minus “used data size”. You can give your new field an alias name like “free storage”: [Screenshot from 2024-10-25 11-39-42] Now you have three fields, but want to hide the field with the total size. This…