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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.
You'll have to figure out the ONT credentials (serial no., password etc.). Should not be too difficult. The device may have a web-ui or equivalent cli commands. Once you get them, you can ditch the device and buy standalone hardware which can run openwrt. A good option is ubiquiti er-x sfp. You can install an ONT sfp modem in it and put it in bridge mode. Openwrt will handle the rest. You may have to whitelist the MAC with the ISP or spoof it. This repo has useful information on the ONT SFP modules that you can buy: https://github.com/Anime4000/RTL960x