You’ve Got (Too Much) Mail: Behind the Scenes of the 3/25/26 Voice Outage
4/29/2026
This post details a cascading outage on March 25th, 2026, affecting Discord's voice and video services. The outage was triggered by a routine infrastructure change that caused a simultaneous shutdown of a significant portion of session management servers. The post explains how the loss of 17% of these servers, which are critical for coordinating real-time infrastructure, overwhelmed a downstream routing service. The analysis focuses on understanding the system's degradation under sudden load and identifying how to improve resilience against such events, particularly in distributed systems.