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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.
I've had a great experience overall self-hosting. Lots of guides out there - here are the steps I followed (including a port forwarding guide). Make sure you get an SSD for the raspberry pi, rather than an SD card.
NOTE:
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Hence, a higher number means a more popular project.