Software complexity makes it harder for teams to rapidly identify and resolve issues. IT service management has evolved from an afterthought to a central part of DevOps. Microservices architectures are prone to delay or missed identification of such concerns. Monitoring mechanisms need to keep up with these complex infrastructures. Maintaining reliability and performance while harnessing this complexity requires a considered, data-driven approach. Enter site reliability engineering (SRE), which bridges the gap between development and operations. In this article, we dive into an essential component of the modern software development workflow: SRE metrics. We explain how you can make them work for your teams.