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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 just replied to a another user who asked how I did it, but as you already have a Pi hooked up, definitely take a look at SmokePing (https://oss.oetiker.ch/smokeping/) - by default it just measures latency to either default or custom endpoints, but if you use this plugin https://github.com/mad-ady/smokeping-speedtest you can get it to monitor your Down and Up link speeds. It can be a bit of a head scratch to get configured, so if you want my config, let me know, happy to send it over.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.