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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.
Not running it in production, but it seems from googling that some people use AnyCable to outsource websocket handling to node or some other more performant server when they need to scale: https://github.com/anycable/anycable
NOTE:
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Hence, a higher number means a more popular project.