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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.
If you are interested, I have been maintaining a guide for it (https://github.com/mateussouzaweb/kvm-qemu-virtualization-guide), but there are many others guides on internet on that subject if you look into virtualization with QEMU/KVM...
NOTE:
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Hence, a higher number means a more popular project.