Klaviyo experienced a minor incident on September 19, 2025 affecting Analytics and Segmentation and 1 more component, lasting 5h 46m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- identified Sep 19, 2025, 02:38 PM UTC
At around 7 AM Eastern time, we began experiencing delays in real-time event processing. Events may be out of date by up to 3 hours. Flows, Segments, Profiles, Reporting, as well as segment-targeted forms, may be impacted. We are actively working to restore real-time processing and will continue to provide updates here.
- identified Sep 19, 2025, 05:07 PM UTC
A fix has been implemented and we are monitoring the results. We expect real time event processing to be fully restored within 1 hour.
- monitoring Sep 19, 2025, 06:42 PM UTC
Event processing has been restored to real-time. There was no data loss as a result of this incident. We’re continuing to monitor and will post another update once we have fully cleared any backlog of processing data.
- resolved Sep 19, 2025, 08:24 PM UTC
This incident has been resolved.