LibreQoS provides quality-of-experience (QoE) shaping and analysis for users, but it has had a major pain point for a long time. Since LibreQoS version 1.4 (released in November 2023), reloading users and the shaping tree could stall the processing pipeline, leading to bursts of packet loss. One of my colleagues even called it “random waves of suck” - a sudden burst of trouble across the network.