Resolved after 2 hours 25 minutes, affecting Klaviyo App and Email Sending and 1 more, on December 18, 2025.
A fix has been implemented and we are monitoring the results.
Affected components
Update timeline
- investigating Dec 18, 2025, 04:10 AM UTC
Starting around 9:52pm US Eastern, a database upgrade failure caused data processing delays in-app. As a result, we are experiencing delays in event processing, flows, unsubscribes, segmentation, sending for certain campaigns, and v3 APIs. No data loss is expected. We are actively working to resolve the incident and will provide updates when possible.
- identified Dec 18, 2025, 05:12 AM UTC
The issue has been identified and a fix is being implemented.
- monitoring Dec 18, 2025, 06:06 AM UTC
A fix has been implemented and we are monitoring the results.
- resolved Dec 18, 2025, 06:36 AM UTC
This incident has been resolved.
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