hhrrmm.. in the initial problem, you mentioned that the /var/lib/docker/overlay2 was growing large in size.. but.. 4GB seems "fine" for docker images.. I wonder .. does your nvme0n1p1 ever report like 85% or 90% used or do you think that the 4GB is a lot ? when you restart the server, does the % used noticeably drop ? that would suggest tmp files inside the docker image itself which.. is possible with docker (weird but, possible)