3 Lines of C++ That Give Your Robot a Fault Memory

A new open-source fault manager for ROS2 robots captures every diagnostic event that normally disappears between refresh cycles. The system requires just 3 lines of C++ code to implement, persists fault history with full metadata, and provides a REST API for querying. It solves the critical problem where intermittent faults (like 47 LiDAR dropouts) vanish before operators can see them, aggregating identical errors into single records with occurrence counts and timestamps.