Klaviyo: Data processing delays
Klaviyo's status page listed this on 18 Dec 2025. Lasted 2.4 h, filed against Klaviyo App, Email Sending, Server-side, Email Sending, Segments and Processing. This is their record, not a measurement of ours.
What happened
Started
Resolved
Lasted2.4 h
What failedKlaviyo App, Email Sending, Server-side, Email Sending, Segments and Processing
Their impactMinor
Regions: their page does not say which. Ours checks from three cities, and the screen we saw is on our own incident pages, where there is one.
What Klaviyo said
On their page: Data processing delays
Klaviyo's status page: “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.”Investigating
Klaviyo's status page: “The issue has been identified and a fix is being implemented.”Identified
Klaviyo's status page: “A fix has been implemented and we are monitoring the results.”Monitoring
Klaviyo's status page: “This incident has been resolved.”Resolved
What our own check saw
Nothing of ours failed that day, or we were not checking Klaviyo yet.
Was your store affected?
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