Garry O'Donnell upgraded observability infrastructure in the DiamondLightSource/workflows repository by implementing OpenTelemetry 0.27.x and introducing OtelGuard for managing tracer and meter provider lifecycles. Using Rust and focusing on dependency management, he enhanced the reliability and security of telemetry data collection, ensuring more complete business analytics. The work involved careful migration of existing setups and validation against current CI/CD pipelines, minimizing workflow disruption. By improving trace and metric consistency across workflows, Garry addressed both technical and operational requirements for observability. The changes were well-documented, reflecting a methodical approach to integrating OpenTelemetry and maintaining robust telemetry practices.