Too much memory consumption of couchdb pods when running on distributions with cgroup v2.

[cax21]

Describe the bug CouchDB pods will not start (due mainly to OOM killed). If we use no resource limits, we can observe the couchdb pods are using peak memory of almost 3.5GB. Then it stabilizes to 1.6GB , which is way too much in any case. Note that this is not observed at all on nodes running on cgroup v1, so we suspect cgroup v2 being the root cause of this resource issue.

Version of Helm and Kubernetes: Kubernetes: 1.27.6 (rancher) Helm : 3.15 Nodes running on : Rocky Linux 9.3 Linux Kernel : using cgroup v2 (see https://kubernetes.io/docs/concepts/architecture/cgroups/)

What happened: At startup couchdb pods are using too much memory (almost 4GB) and get killed if the resources are not given to support such a high load.

What you expected to happen: At startup, couchdb pods should consume only few MB of memory as they would do on nodes running with cgroup v1

How to reproduce it (as minimally and precisely as possible): You can easily reproduce by deploying latest chart 4.5.6 on such cluster described above. You will notice the 3 couchdb pods taking more than 3GB of memory.

Anything else we need to know: Well, may be we could expect some specific tuning in the charts for handling cgroup v2 nodes, if possible. We haven't found anything in the documentation about that.