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If you have the kube-state-metrics + Prometheus with a sufficiently long retention time, then you could write a PromQL query based on the "kube_pod_created" metric to get the answer to your question. It might be possible with the metrics-server + Prometheus, but I think it would not count some pods that live less than one scrape interval.
Billing / cost monitoring solutions are probably based on the same metrics. These are the open-source ones that I found - https://www.opencost.io/ and https://github.com/project-koku/koku
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