In April 2025, Jow Parks enhanced performance monitoring for block-building systems by implementing comprehensive metrics across the flashbots/op-rbuilder and flashbots/rbuilder repositories. Using Rust, he introduced instrumentation to track flashblocks, messages sent, and invalid blocks within both OpRBuilder and OpPayloadBuilder, enabling unified observability during block construction and transaction simulation. This work established consistent metrics collection across repositories, providing deeper insights into system behavior and supporting data-driven optimization and capacity planning. By focusing on metrics and performance monitoring, Jow’s contributions improved troubleshooting efficiency and laid the groundwork for more robust block-building workflows without introducing new bugs during the development period.