Another great article from the Netflix Blog - Linux performance analysis in 60s
In 60 seconds you can get a high level idea of system resource usage and running processes by running the following ten commands. Look for errors and saturation metrics, as they are both easy to interpret, and then resource utilization. Saturation is where a resource has more load than it can handle, and can be exposed either as the length of a request queue, or time spent waiting.
Well worth a read, this team is fantastic at breaking down how they do their ops and making the world a better place 🙂