[okwhateverdude]

Two. And what's funny, I saw some of the fallout from the transition from v1 to v2 only last year at my last gig. Company upgraded Debian and Debian maintainers opted to go v2 only in the kernel build. However, the version of JVM the company was using did not fully support v2. Without the cgroup support, each JVM in a container thought they had the resources of the whole system. It was a cluster (heh) fuck, as in that all of the affected services OOM'd thinking they had more heap potential and the k8s cluster was churning pods like no tomorrow.