Memory Utilisation widget shows warnings based on memory request value, not limit value

[wvh]

Hello!

The Memory Utilisation and Health widgets show the request value and warn if the memory usage approaches 100%.

However, we've got the following limits set:

  resources:
    requests:
      memory: "2Gi"
      cpu: "1"
    limits:
      memory: "12Gi"

Should the widget only show warnings if the memory usage approaches the limit of 12Gi and not the request value of 2Gi?

Now it feels things are about to go horribly wrong, while the database can easily request more memory if it needs.

[P4sca1]

In my opinion, it is correct that the warnings are based on memory requests, not limits. Kubernetes only guarantees that you get the requested memory. There is no guarantee, that your pod memory usage can grow up to the limit you set. With your current configuration you are risking OOM kills. I suggest setting memory request = memory limit. See https://home.robusta.dev/blog/kubernetes-memory-limit for more context.