# Klaviyo: Real-time segmentation delays

- Impact (vendor’s label): major
- Status: resolved
- Started: 2026-03-27 04:46 UTC · Resolved: 2026-03-27 05:15 UTC · Duration: 30 min
- Updates: 2 · Affected components: Segmentation, Segments
- [Vendor status page: https://stspg.io/0y8lyxjtwy4q](https://stspg.io/0y8lyxjtwy4q)
- [Company: Klaviyo](https://rewindex.com/company/klaviyo.md)

## Summary

Klaviyo reported major real-time segmentation delays affecting a subset of customers, with segments up to 2.5 hours out of date.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. _(machine-written, sol)_
## Timeline of updates

- **monitoring** 2026-03-27 04:46 UTC: 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 Segments may be out of date by up to 2.5 hours.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.
- **resolved** 2026-03-27 05:15 UTC: Real-time segmentation is processing in real-time, and this incident has been resolved.

## Rewindex changes for this incident

- 2026-03-27 04:46 UTC: [Major incident: Real-time segmentation delays](https://rewindex.com/change/idf3b30aad94ff6.md)


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Canonical: https://rewindex.com/company/klaviyo/incidents/k106gdf6wbw8 · Markdown: https://rewindex.com/company/klaviyo/incidents/k106gdf6wbw8.md · JSON: https://rewindex.com/api/v1/companies/klaviyo/incidents/k106gdf6wbw8 · Generated 2026-10-18T10:00:24.117Z