A lightweight monitor that watches Windows and Linux servers across locations from one dashboard

The servers we maintain run in different cities, different data centres and on different operating systems. We did not want to learn about a full disk, a stopped service or a brute-force attempt on SSH only after the problem had grown. So we built System Watcher for our own operations: a small Go agent runs as a service on each server and collects metrics, and a hub pulls that data over Tailscale’s encrypted private network, stores it in SQLite and presents it in a React interface. The agents are never exposed to the internet. As an internal tool it is not public and still in development; the screenshots here were taken locally with three demo servers running in Docker containers.