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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.
So you're at the point where you want to run your sites in a cluster. the only thing I am aware of that might somewhat easily let you run a cluster is https://github.com/presslabs/stack/ which is a beta open source project to spin up kubernetes cluster for WordPress.
NOTE:
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Hence, a higher number means a more popular project.