Worked on the facebook/kuduraft repository to deliver end-to-end overload protection metrics propagation from secondary to primary nodes using the Raft transport. This involved extending the metrics contract in metadata.proto by adding seven new metric fields, and implementing serialization and deserialization logic in C++ within MysqlRaft.cpp. The solution collected atomic metrics in slave_stats_daemon.cc, populated them into MysqlServerMetricsData, and surfaced the data through performance_schema.replica_statistics for real-time observability. The work leveraged backend development skills, database management, and protocol buffers, and was validated through a buck2 build and code review, demonstrating depth in distributed systems engineering within a one-month period.