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I have been using rancher since it was in beta and I have never seen anything that would do this. But it would be cool if there was something.

There's a project named Kubecost in the Apps -> Charts with Rancher 2.6.6. I know nothing about it, but perhaps it might have something useful (just from the name)?

Yes, we recommend using kubecost. https://www.suse.com/c/kubecost-and-suse-rancher-for-cost-management/