Garbage collection old vs young

Hi, Question,
On my nodes (7.9.3) I see the following graph's in stackmonitoring:

What strikes me is the 0 for old .
As far as I know, the default ratio is 2? So I would not expect 0 here, but about double of what young shows.
For GC i have pretty much the default settings in jvm.options with jvm 15, so

(I did try to change the G1ReservePercent to 15 on 1 of my nodes but that did not really change anything).

And does anyone know a picture of a graph that shows how a decently configured GC should show up in the graphs?

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