How to count how many pods were started by namespace each day in PromQL?

I'm trying to answer a question of how many pods were started/scheduled/whatever per namespace per day. I have not found any useful counter-type metric that would be counting that, just related gauges like kube_pod_status_scheduled_time.

So far best thing I was able to come up with is this:

topk(3,
  sum_over_time((
    delta((
      count by (namespace) (
        count by (pod, namespace) (kube_pod_status_scheduled_time{namespace=~".*-tenant"})
      )
    )[5m:]) > 0
  )[1d:])
)

But first this seems to be too heavy/inefficient to finish before request timeout and second I'm very skeptical it is actually correct.

Would you have any ideas please?