Ideally this README: https://github.com/get-convex/convex-backend/tree/main/self-hosted should mention what is the minimum amount of memory and CPU cores/etc. needed to run the default backend configuration.
My current conservative kube limits:
resources:
requests:
memory: "4Gi"
cpu: "500m"
limits:
memory: "6Gi"
cpu: "4000m"