Vigil was created to solve intermittent home fiber network outages (1-60 seconds, multiple times daily). The goal: continuous monitoring with traceroute-based hop analysis to identify the culprit (local router, ISP equipment, or ISP backbone).
Features were implemented sequentially from 001 (Core Infrastructure) through 016 (Process Timeout). See docs/README.md for the full feature index and PLAN.md for the original design blueprint.