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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
This seems like a pretty good fit for HNC. You can restrict users to only create subnamespaces, and then ensure that the configmaps in the parent namespaces get propagated to the children.
If you really want a brand-new namespace (that's not hierarchical) to be populated with new objects, I believe Kyverno generators can do that. But giving arbitrary users the ability to create any new namespaces anywhere on the cluster could lead to management problems fairly quickly.
Probably you can find more opensource example on this but I found this one, here: https://github.com/TheYkk/synator