In this talk, we will share insights from our journey of monitoring multi-region systems. We started with traditional monitoring tools (Nagios, Zabbix), which didn’t serve our needs. Moving to a commercial cloud-based service felt like driving a Rolls-Royce and it cost like one. In the end, we moved to an open source solution, which served all our needs and cost almost nothing – AKA Prometheus & Grafana. We will talk about the moving parts, the DOs, and the DON’Ts, so you can implement it in your environment.