refactor: show top 20 repository cgroups
What
Change cgroup CPU/Memory usage to only show the top 20.
Why
In gstg
we have 100 per gitaly node, in gprd
we are going to have
more per node and the grafana panel wouldn't even render. Showing the
top 20 will help us find the top offenders.
Reference: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/16240