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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.
Kubernetes Cluster API is not the same thing as Kubernetes API. Kubernetes Cluster API, which you linked and just got to v1 9 days ago https://github.com/kubernetes-sigs/cluster-api is for provisioning other clusters from an existing cluster using K8S API. The core APIs are and has been production ready for some time now.
Take a look at OpenFaaS. It's exactly the serverless, cloud-neutral solution you were talking about. And yes, it runs on K8s.
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