Software metrics can be used effectively to judge the maintainability and architectural quality of a code base. Even more importantly, they can be used as “canaries in a coal mine”: to warn early about dangerous accumulations of architectural and technical debt. This session will introduce some key metrics that every architect should know and also looks into the current research regarding software architecture metrics. We will make use of a free tool called Sonargraph-Explorer, which will allow you to obtain most of the introduced metrics for your own projects.