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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.
Looks like MkDocs with a material dark theme, plus MermaidJS for the diagram. MkDocs turns various markup formats (namely markdown) and converts them to nice hostable static HTML. Homelab folks and other dev shops will often integrate it into CI/CD pipelines. You don't have to though.
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.