[tor-relays] Weird spike in written bytes per second

Hi, the graph shows a marked difference between written bytes per second and read bytes per second om 2022-05-19 and 2022-05-20. In any other day the bytes are roughly the same. What might my node have "written" on those two days? https://metrics.torproject.org/rs.html#details/A4E74410D83705EEFF24BC265DE2B... Thanks, Marco