UOM KB vs KiB

[LFrank2021]

Hello,

I am currently facing a strange issue with the UOM of the performance data.
The perl script currently returns the values with the KB unit.
The Icingaweb is showing them correctly as 512GB while the Grafana rendering is showing them either as 500GB (bytes(IEC)) or 537GB (bytes(SI)).
For Grafana I was able to generate a workaround when changing the UOM to KiB (SI).
But Icingaweb now shows the performance data as 536,870,912.00 kib and does not convert it to MiB or GiB anymore.

Example output (just change KiB to KB and vice versa):

# check_mem.pl -w 95 -c 98 -u -C
OK - 51.6% (276939100 kB) used.|TOTAL=536870912KiB;;;; USED=276939100KiB;510027366;526133493;; FREE=259931812KiB;;;; CACHES=259714116KiB;;;;

Any ideas, on how to get the correct 512G(i)B for Icingaweb AND Grafana?
Can we get an option for the UOM?

Kind regards
Frank