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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.
Netdata comes to mind; it handles collection, storage & display all in one, and for many use-cases "just works" out-of-the-box. It's not really designed for long-term metrics in the default configuration, though, what with one second granularity and no support for multiple levels of granularity.
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.