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Moving on down the list to lower voltage domains we get MCU Vcore, the output of the on die LDO for the STM32H7.

Not a whole lot going on here. I might poke more when I have a slightly busier firmware running but I'm not worried.

I think around the 7.5us mark we might be seeing the CPU activity increase when An Ethernet frame arrives? There looks like an activity spike in the spectrogram on the 256 MHz AHB bus frequency, but it's really hard to see if you don't know what to look for.

Average voltage is 1.364V which is right where it should be. Ripple is 5.92 mV p-p / 0.68 mV RMS, totally fine.