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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.
Also, for being able to quickly revert mishaps with your vms, and lxc containers i use https://github.com/Corsinvest/cv4pve-autosnap to make hourly snapshots of all vms and lxc containers (taking snapshots suspends disk io from the vm's point of view. Some software, especially game servers, can't deal with this).
NOTE:
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Hence, a higher number means a more popular project.