Netdata

Netdata is a real-time infrastructure monitoring agent that auto-discovers what is running on your server and starts collecting metrics without any configuration. Install it with a single command, open port 19999, and you have per-second metrics for CPU, memory, disk, network, Docker containers, databases, and web servers — all in a browser-based dashboard that requires nothing else to set up.

The auto-detection covers over 800 integrations. Point it at a server running Nginx, PostgreSQL, and a handful of Docker containers and Netdata identifies all of them and begins graphing their internals within seconds. The agent uses around 150MB RAM and under 5% CPU, so it adds meaningful visibility without competing for resources with the things you are actually monitoring.

The limitation that matters most: there is no built-in multi-host view without Netdata Cloud. If you run more than one server, seeing them together in a single dashboard requires either connecting to their managed cloud service or running a self-hosted Parent node, which adds significant setup. The free cloud tier caps at five connected nodes. The paid tier charges per node per month. Netdata previously supported a --no-cloud flag for users who wanted entirely local operation; that flag was removed, and the product now nudges you toward cloud registration persistently. That shift has frustrated parts of the self-hosting community who adopted it precisely to avoid that kind of dependency.

For a single server or a small homelab where you want instant visibility without spending a day writing YAML, Netdata is hard to beat. For multi-server infrastructure where you need centralized alerting pipelines and long-term retention, Prometheus and Grafana give you more control at the cost of considerably more setup.

Netdata: Pros & Cons