Articles
Monitoring Distributed Systems
The Google SRE book chapter, written by Rob Ewaschuk and edited by Betsy Beyer, that introduced the "four golden signals": latency, traffic, errors, and saturation, as the minimum viable dashboard for any user-facing service. What's held up is the discipline behind it: pick a small number of signals you'll actually look at during an incident instead of a wall of graphs nobody reads at 3am. I still use this as the starting checklist whenever I'm setting up monitoring for a new service.