Delay in Real-Time Event Processing

What to do

• Check whether you use Klaviyo Segments, Profiles, Analytics. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 5h 47m it lasted.

  Anything that failed between 2025-09-19 14:38 UTC and 2025-09-19 20:24 UTC may need a replay.

• Subscribe to Klaviyo's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=klaviyo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Klaviyo 4

1. identifiedSep 19, 2025, 2:38 PM UTC

   At around 7 AM Eastern time, we began experiencing delays in real-time event processing. Events may be out of date by up to 3 hours. Flows, Segments, Profiles, Reporting, as well as segment-targeted forms, may be impacted. We are actively working to restore real-time processing and will continue to provide updates here.

   provider

2. identifiedSep 19, 2025, 5:07 PM UTC

   A fix has been implemented and we are monitoring the results. We expect real time event processing to be fully restored within 1 hour.

   provider

3. monitoringSep 19, 2025, 6:42 PM UTC

   Event processing has been restored to real-time. There was no data loss as a result of this incident. We’re continuing to monitor and will post another update once we have fully cleared any backlog of processing data.

   provider

4. resolvedSep 19, 2025, 8:24 PM UTC

   This incident has been resolved.

   provider

Corrections

None so far.

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