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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.
For learning it's worth it. I did a similar thing with old laptops and that's what got me into home labbing. Checkout K3s , since you already have ubuntu running on all of your hosts you can install k3s on top of each of them.
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