Alex Mazzeo developed enhanced resource monitoring for the temporalio/sdk-core repository, focusing on accurate CPU usage calculation within cgroup environments. He implemented cgroup v2 CPU usage measurement with a sysinfo-based fallback to ensure robust monitoring even when cgroup data is unavailable. This work included comprehensive unit tests for both CPU and memory reading, improving reliability and maintainability. Alex also upgraded the CI/CD pipeline to support cross-compiling and automated testing within Docker containers, ensuring consistent results across environments. His contributions leveraged Rust, Shell scripting, and Docker, demonstrating depth in system programming, resource management, and automated testing within a modern development workflow.