Le Qiyue enhanced the LeveledCompactor component in the grafana/prometheus repository, focusing on reliability and observability within backend systems. Using Go and applying system design principles, Le introduced context cancellation during block opening, allowing compaction operations to be interrupted gracefully and improving responsiveness under load. To support better monitoring and diagnostics, Le added a metrics-capable constructor and extended the options structure to expose runtime metrics, enabling more effective performance tuning and alerting. This work addressed operational pain points by reducing the risk of stuck processes and providing deeper visibility into the compaction pipeline, reflecting thoughtful engineering within a complex codebase.