block: used bytes reporting regression test
block: used bytes reporting regression test

Signed-off-by: Iulian Barbu <3d73465fd48f87db8f58a730f2d3c3f04dff43ae@amazon.com>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker