feat: Add PVC saturation metrics to get-hybrid refarch
What
Add PVC saturation metrics to get-hybrid refarch
Why
The built-in kube-prometheus-stack alerts only fire when the disks are almost full; by adding saturation metrics the Tamland capacity planning process will hopefully pick things up far in advance and allow for calm measured actions.
See also https://gitlab.com/gitlab-com/gl-infra/gitlab-dedicated/team/-/issues/5075 (internal link)