Netdata

https://www.netdata.cloud/

Monitor everything in real-time

Instantly diagnose slowdowns and anomalies in your infrastructure with thousands of metrics, interactive visualizations, and insightful health alarm

Snippet from Wikipedia: Netdata

Netdata is a partially open source tool designed to collect real-time metrics, such as CPU usage, disk activity, bandwidth usage, website visits, etc., and then display them in live, easy-to-interpret charts.

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