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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.
The tool that gathers the data is one that I wrote (GitHub: avojak/pihole-influxdb-monitor), and so it supports multiple Pi-holes. As for aggregating, I think you could accomplish that on the Grafana side by modifying the queries to InfluxDB. That GitHub repo has the data for the dashboard so you can see which queries I used to pull the data. BUT if you open an issue on the GitHub page I can certainly look into having it post aggregate stats for fields that make sense!
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