Changes / Klaviyo / Flow Sending Delays
Klaviyo: Incident updated: Flow Sending Delays
Summary
Summary pending. The diff below shows exactly what changed.
What changed
Before: identified
After: monitoring
Before: not present
After: Flow processing has resumed and the delayed backlog is actively clearing. This incident affected all flow processing - including flow-triggered email, SMS, WhatsApp and push messages, as well as flow updates to profiles and lists. Some customers may continue to see delays until the backlog fully catches up. Immediate sends were not affected. We continue to monitor closely and appreciate your patience throughout this incident.
Compared with the previous archived version of this incident (10-minute polling). View the live incident.
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays (this change) | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Major incident: Flow Sending Delays Klaviyo reported a major degradation in flow message sending starting 2026-10-17 17:01 UTC, with some customers’ flow emails delayed; immediate sends remained unaffected. The incident was still open when archived, after 1 h 4 min at the last update. Klaviyo said it had identified the cause and was working on a fix, without specifying either. | Major incident |