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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.
Not directly related to OPNsense, but NextDNS with the NextDNS proxy running locally, can pass along the clients hostname and filter based on that. At one point you could run the NextDNS proxy on OPNsense, which could pass that info to NextDNS, but I’m not sure of the current status of that. https://nextdns.io/
NOTE:
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Hence, a higher number means a more popular project.