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Snippet from Wikipedia: Netdata

Netdata is an open source tool to visualize and monitor real-time metrics, optimized to accumulate all types of data, such as CPU usage, disk activity, SQL queries, visits to a website, etc.

The tool is designed to visualize activity in the greatest possible detail, allowing the user to obtain an overview of what is happening and what has just happened in their system or application.

Netdata Corporation is located in Framingham, Massachusetts.