December 2024 monthly summary for microsoft/DiskANN focused on improving observability and performance diagnostics for disk search operations. Implemented a targeted instrumentation enhancement that provides actionable performance metrics to users and engineers, enabling data-driven optimization of disk I/O during search. Key change delivered: Disk Search Command Performance Metrics: Mean IO (us) added to both the header and logs, enabling immediate visibility into disk I/O timing during searches. The change was tracked under commit fc3c6e25b4229016d1b40d2510c327d832b6c25b (Add mean_io timing in disk search cmd output (#607)). Value delivered to the business: improved observability, faster root-cause analysis for I/O related performance issues, and a foundation for ongoing performance tuning in large-scale deployments. Overall, this work demonstrates a strong emphasis on reliability, performance instrumentation, and developer-facing metrics to support operational excellence. Technologies/skills demonstrated: instrumentation and metrics design, header/log formatting improvements, performance-focused development, Git-based change tracking, and integration with DiskANN’s existing command interfaces.