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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.
Disclaimer, I dont know if the agent is available for Pi, so check that first. its available for linux, but i'm not sure if that includes ARM (i.e. raspberry pi). Of course if you are adventurous enough, you could always build it from source: https://github.com/arduino/arduino-create-agent
NOTE:
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Hence, a higher number means a more popular project.