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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 could probably hack this together yourself though. For pure qemu, u/darkguy2008 at some point wrote hotplugger. For libvirt, however, you're probably better off hacking this together yourself using udev rules and an attach/detach script that gets fired based on them. This old comment of mine might help to get you started with that. Note, however, that I never had to deal with device paths for hubs; they might not be as stable as you like.
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