New symbols on spark screen

I just discovered some new symbols in the upper right corner of the Spark3 display.
I wonder what they represent?

Current memory use (at the time the display is updated) and peak memory use since reboot.

Mainly shown because once you get close to 90, problems can occur. This helped us identify these issues.

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Left: current memory usage. Right: peak memory usage.

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@Bob_Steers, @Elco Ok, thanks for the information.
Good to know.