Netdata

Netdata is high-fidelity infrastructure monitoring and troubleshooting.
Open-source, free, preconfigured, opinionated, and always real-time.

Netdata’s distributed, real-time monitoring Agent collects thousands of metrics from systems, hardware, containers, and applications with zero configuration.
It runs permanently on all your physical/virtual servers, containers, cloud deployments, and edge/IoT devices, and is perfectly safe to install on your systems mid-incident without any preparation.