Alan Wang developed and contributed a performance observability feature to the apache/cassandra repository, focusing on enhancing monitoring for read-heavy workloads. He implemented SSTable Read Logging, a mechanism that records queries accessing more than a configured number of SSTables, which helps identify and troubleshoot performance bottlenecks in production environments. Using Java and leveraging his expertise in backend development and database management, Alan designed a dedicated logging system that supports faster diagnosis and more informed tuning of Cassandra clusters. This work improved the reliability and operability of large-scale deployments, laying the foundation for deeper metrics and more efficient debugging in future iterations.