# Svix: Most routes 5xx in the US region [resolved]

- Impact (vendor’s label): major
- Status: postmortem
- Started: 2023-03-11 20:35 UTC · Resolved: 2023-03-11 21:23 UTC · Duration: 48 min
- Updates: 6 · Affected components: API
- [Vendor status page: https://stspg.io/jxyqtbd7b2mz](https://stspg.io/jxyqtbd7b2mz)
- [Company: Svix](https://rewindex.com/company/svix.md)

## Timeline of updates

- **investigating** 2023-03-11 19:38 UTC: We are currently investigating this issue.
- **investigating** 2023-03-11 20:27 UTC: Still investigating.
- **investigating** 2023-03-11 20:35 UTC: We are still investigating, but we put mitigating changes in place.
- **monitoring** 2023-03-11 20:42 UTC: The service is back up. We are still monitoring, but everything is operational.
- **resolved** 2023-03-11 21:23 UTC: The issue has been resolved, though we are still trying to locate the root cause. There were no deploys today (Saturday), so it's not due to any change on our end, and the activity doesn't look unusual. For whatever reason our API workers went from ~10% utilization (normal) to 100% in a short span of time. We are investigating with AWS. Update: after investigating with AWS for a few hours, neither they nor us are able to understand the reason for the memory usage jump though their and our metrics don't indicate any change in load, underlying systems, or anything like that. They've indicated that OOM can happen even if there hasn't been any indication to that in the AWS metrics.  We are still investigating.
- **postmortem** 2023-03-12 21:36 UTC: We are still investigating, but here is our more complete update regarding this incident: \[https://www.svix.com/blog/we-had-a-partial-outage/\](https://www.svix.com/blog/we-had-a-partial-outage/)

## Rewindex changes for this incident

- 2023-03-11 20:35 UTC: [Major incident: Most routes 5xx in the US region \[resolved\]](https://rewindex.com/change/i7786293c56fa93.md)


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Canonical: https://rewindex.com/company/svix/incidents/23w4yvk7rd6c · Markdown: https://rewindex.com/company/svix/incidents/23w4yvk7rd6c.md · JSON: https://rewindex.com/api/v1/companies/svix/incidents/23w4yvk7rd6c · Generated 2026-10-19T21:09:59.029Z