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hierarchical-namespaces
Home of the Hierarchical Namespace Controller (HNC). Adds hierarchical policies and delegated creation to Kubernetes namespaces for improved in-cluster multitenancy.
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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.
Kyverno's a great option. Depending on the usecase you might want to consider https://github.com/kubernetes-sigs/hierarchical-namespaces as well (disclaimer: I'm the original author) - it's good if groups of related namespaces need related objects.
NOTE:
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Hence, a higher number means a more popular project.