# Data processing delays

- Provider: [Klaviyo](https://down.guide/klaviyo)
- Level: confirmed
- Impact: Degraded
- lasted 2h 26m
- started 2025-12-18 04:10 UTC
- Klaviyo App, Email Sending, Server-side +3
- us
- id: DWN-baa65ecc9a
- Official page: https://stspg.io/pjsg6jl9cwgq

## Updates from Klaviyo
### 2025-12-18 04:10 UTC: investigating
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.

### 2025-12-18 05:12 UTC: identified
The issue has been identified and a fix is being implemented.

### 2025-12-18 06:06 UTC: monitoring
A fix has been implemented and we are monitoring the results.

### 2025-12-18 06:36 UTC: resolved
This incident has been resolved.

From the builder: does your app depend on Klaviyo? [Sazabi](https://www.sazabi.com/?utm_source=down-guide&utm_medium=markdown&utm_content=klaviyo) detects problems in your own logs without hand-written monitors, and you can ask it in plain language which errors mention Klaviyo.

---
down.guide reads providers' official status pages every minute and adds its own evidence, always labeled. Free, no account. Agents: MCP at https://down.guide/mcp, REST at https://down.guide/api/v1, feeds at https://down.guide/feed. Built by [Sazabi](https://www.sazabi.com/?utm_source=down-guide&utm_medium=markdown&utm_content=DWN-baa65ecc9a), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards.