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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.
Check NetXMS. It is free-to-use self-hosted software that looks to be capable to provide required monitoring. https://www.netxms.org/ This list of other tools can be helpful for your research of server and network monitoring software. https://www.starwindsoftware.com/blog/you-cant-have-too-much-monitoring
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.