During August 2025, Nicolas worked on the prometheus/node_exporter repository, focusing on reliability and performance improvements rather than new feature development. He addressed a critical regression in read-only filesystem detection by updating the logic to incorporate both super options and mount options, restoring accurate status reporting after the transition to mountinfo. This fix improved the robustness of system monitoring metrics for operators. Additionally, Nicolas optimized the integer-to-string conversion path in Go, reducing CPU usage during metric collection. His work demonstrated strong skills in Go programming, Linux internals, and performance profiling, delivering targeted solutions to maintain accurate and efficient monitoring.