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ChangesKlaviyoOutbound Webhook Delays

Klaviyo: Major incident: Outbound Webhook Delays

Major incidentdegradation (model (Jev), 92%)Changed Detected status.klaviyo.com (opens in new tab)
Summary

Klaviyo reported a major Analytics incident starting 2026-10-22 22:20 UTC: some customers and connected third-party apps experienced event webhook delivery delays. New webhook processing was temporarily paused, earlier webhooks continued arriving late, and webhook data was retained; flow webhook actions were unaffected. The incident remained open when archived, with 0 minutes elapsed at the last update.

Machine-written from the diff below (Sol; type: incident degradation). Check the diff before relying on it.

Incident page: the full timeline of updates

What changed

Struck in red is what Klaviyo removed; blue is what they added. Muted text is unchanged context.

AddedTitle#1
Before: not present
After: Outbound Webhook Delays
AddedImpact#2
Before: not present
After: major
AddedStatus#3
Before: not present
After: identified
AddedStart time#4
Before: not present
After: 2026-10-22 22:20 UTC
AddedAffected components#5
Before: not present
After: Analytics
AddedUpdateidentified#6
Before: not present
After: Some customers and third-party apps connected to Klaviyo accounts are experiencing delays receiving event webhooks. Webhook actions in flows are not affected at this time. To support recovery, we temporarily paused processing of new webhooks at 5:11 PM US/Eastern on October 22, 2026, and earlier webhooks are still being delivered with delays. Webhook data is being retained, and we expect delayed and paused webhooks to be delivered once processing resumes. We are working to resolve this as quickly as possible and will share another update shortly.

First version of this incident archived by Rewindex. View the live incident (opens in new tab).

Archive proof

Rewindex commits each version of an incident it captures to a daily checkpoint, chains it to the day before, and has the checkpoint timestamped by FreeTSA and DigiCert. That proves this record existed by then and has not been changed since, by anyone, Rewindex included.

How the archive is checked, and what it cannot prove.

History of this incident

Friday, October 23

2 incident changes

Thursday, October 22

1 incident change

Cite this

Major incident: Outbound Webhook Delays on Klaviyo’s status page, changed 2026-10-22 22:20 UTC (change 1 of 3).

Title
Major incident: Outbound Webhook Delays
Vendor
Klaviyo
Date
URL
https://rewindex.com/change/i7d5e9fc8a2d5c5

All Klaviyo changesKlaviyo profileMarkdownJSON