Let's design a monitoring and alert system. Initially, this system focused solely on production environments. However, our infrastructure has grown, encompassing staging, QA, and development environments. We need to expand the system's capabilities to monitor these diverse environments while maintaining a robust and reliable alerting mechanism.

The core challenge lies in the heterogeneity of these environments. Production metrics are typically focused on performance, availability, and error rates. Staging might emphasize integration testing results and deployment stability. QA could focus on test coverage and bug detection, while development might involve resource utilization and build success rates. The monitoring system should be flexible enough to accommodate these varying needs. Moreover, alerts need to be routed to the appropriate teams based on the environment and severity of the issue. A critical failure in production requires immediate attention from the on-call team, while a minor issue in development can be deferred.

This system must be designed with extensibility and maintainability in mind, allowing us to easily add new environments, metrics, and alert configurations in the future. Think about using design patterns to allow addition of metrics dynamically without changing the core implementation.

Requirements