Klaviyo change history: Real-time segmentation delays

Klaviyo reported major real-time segmentation delays affecting a subset of customers, with segments up to 2.5 hours out of date. The incident started at 2026-03-27 04:46 UTC and lasted 29 min, resolving at 2026-03-27 05:15 UTC. Engineering identified a solution, and Klaviyo confirmed real-time processing was restored.