Arvados

cgroups support is one of those things where we're entirely reliant on the host distribution and it's been a relatively fast-moving target with the migration from cgroups v1 to v2. Because of that, our configuration procedure has drifted over time, and we've struggled to keep it all consistent.

As of Arvados 3.0 we should fully support cgroups v2 and should be able to do the right thing without any configuration on the distribution. Remove all instructions and commands that say otherwise. For example:

• GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX cgroup_enable=memory swapaccount=1 systemd.unified_cgroup_hierarchy=0" in the compute node build script (pending removal in #22317)
• "Currently Arvados is not compatible with the new cgroups accounting, also known as cgroups v2" in source:doc/install/install-docker.html.textile.liquid

There may be others. Finding and addressing those is part of this ticket.