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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.
There's also a script available written by another nperson which will automate the deployment of a Libre (Free) Edition (aka "From the sources" version) of XOA for you in a matter of minutes. Give this a look: https://github.com/ronivay/XenOrchestraInstallerUpdater
NOTE:
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Hence, a higher number means a more popular project.