Klaviyo experienced a critical incident on May 23, 2025 affecting Flow Email Sending and Flow Triggering, lasting 4h 3m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating May 23, 2025, 04:22 PM UTC
Starting at approximately 11 AM (US Eastern) we identified an issue impacting flows affecting both flow evaluations and flow message sending. We are investigating the issue and will continue to post updates here.
- identified May 23, 2025, 04:38 PM UTC
We have identified a database issue affecting flow functionality, originally beginning at 11:00 AM (US Eastern). This includes flow message sending, flow triggering, and flow processing. Campaign messaging and event processing is unaffected. We are working to fix the issue and will keep this page updated with further developments.
- monitoring May 23, 2025, 07:31 PM UTC
At approximately 2:55 PM (US Eastern), we have addressed the underlying issue and that delayed flow functionality. Flow messages sending is now real time and any flows that should have triggered are expected to trigger on a delay. Any delayed flow messages will be sent.
- resolved May 23, 2025, 08:25 PM UTC
This incident has been resolved.