Angel Barrera Sanchez developed a metric expiration control feature for the grafana/opentelemetry-ebpf-instrumentation repository, enabling operators to disable metric expiration by setting the Time-To-Live (TTL) to zero. Working in Go and focusing on backend development and system programming, Angel updated the DeleteExpired logic to skip expiration when TTL is zero and wrote comprehensive tests to validate both the disabled and standard expiration paths. The implementation included clear documentation and code comments to support long-term maintainability. By aligning the work with a specific feature request, Angel ensured traceability and delivered a solution that directly addressed business and operational requirements.