Sergey Nikitin refactored the indexing statistics management within the Near-One/mpc repository by moving IndexerStats into the IndexerState struct, integrating its initialization and usage directly into the core indexing state. This approach centralized metric tracking, improving encapsulation and reducing the risk of stat fragmentation or drift. By restructuring the indexing module in Rust, Sergey enhanced maintainability and set a clear foundation for future metric-related features, all while minimizing changes to the external API. The work demonstrated thoughtful system design and careful attention to code organization, resulting in a cleaner, safer indexing module that supports ongoing development and scalability.