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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.
Actually looking further into this, it's using the 'Cowboy' webserver, which appears to be for Erlang. You might be able to use PHP alongside, but it's unusual enough to doubt it.
I did the same stuff for displaying graphs, see it here https://github.com/loophp/phptree/issues/18#issuecomment-721666161
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