In just 20 years, software engineering has shifted from architecting monoliths with a single database and centralized state to microservices where everything is distributed across multiple containers, servers, data centers, and even continents. Distributing things solves scaling concerns, but introduces a whole new world of problems, many of which were previously solved by monoliths.
Temperature, time, and space. Metric makes it easy to relate them all. Now that's excellent API design.