Outage in Klaviyo

Real-time segmentation delays

Resolved Major

March 27, 2026 - Started 1 day ago - Lasted 33 minutes
Official incident page

Incident Report

Summary AI Generated

Klaviyo experienced delays in real-time segment processing starting at 8:15 PM US Eastern on March 26th, affecting a subset of customers with segments becoming out of date by up to 2.5 hours. The engineering team identified and implemented a solution within 33 minutes. Real-time segmentation functionality was fully restored and returned to normal processing speeds.

Starting around 8:15 PM US Eastern 26th March, we began seeing delays in real-time segment processing for a subset of customers. Segments may be out of date by up to 2.5 hours. Engineering have identified a solution and are working to implement the fix shortly. We will continue to provide updates as real-time segmentation functionality is restored.

Components affected

Klaviyo Segmentation

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Latest Updates ( sorted recent to last )

RESOLVED 1 day ago - at 03/27/2026 05:15AM

Real-time segmentation is processing in real-time, and this incident has been resolved.

MONITORING 1 day ago - at 03/27/2026 04:46AM

Starting around 8:15 PM US Eastern 26th March, we began seeing delays in real-time segment processing for a subset of customers. Segments may be out of date by up to 2.5 hours.

Engineering have identified a solution and are working to implement the fix shortly. We will continue to provide updates as real-time segmentation functionality is restored.

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