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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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Frontend code is in here
https://github.com/netdata/cloud-frontend
I do believe that the FE part is not open source but a custom licence.
So agent is still all open source but the FE code is not is my understanding.
Anyway not at all an expert here or anything but will try ping someone internally to explain it to me or jump in here to do a better job than me.
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