RudderStack: Ingestion and user transformation timeout issues affecting a subset of the EU customers

Impact: majorStatus: resolvedStarted 2026-01-28 21:59 UTCResolved 2026-01-28 22:49 UTC (51 min)2 updatesSource: stspg.io

Summary

RudderStack reported a major EU ingestion and user transformation timeout incident starting 2026-01-28 21:59 UTC, resolved at 22:49 UTC after 50 min. Ingestion returned 5xx errors for some EU customers; SDK retries likely recovered events, but Server Side SDK data loss was possible. Some user transformation executions also timed out.

Machine-written from the archived incident (Sol). Check the timeline before relying on it.

Affected components: Data Ingestion - Data Ingestion (EU)Data Ingestion (EU)

Timeline of updates

identified2026-01-28 21:59 UTC
The issue has been identified and a fix is being implemented.
resolved2026-01-28 22:49 UTC
Between 21:55 - 22:25 UTC RudderStack experienced a temporary ingestion issue which caused 5xx errors on ingestion for a subset of the EU customers. Based on the retry logic of the SDK, these events were likely retried but there might have been some data loss for Server Side SDK's during this timeframe. Also between 21:09 - 22:00 UTC we have observed timeout errors on some of the user transformation code executions that would have dropped the events. We will be running replay for such events wherever data retention is configured

Rewindex changes for this incident

Major incident: Ingestion and user transformation timeout issues affecting a subset of the EU customers 2026-01-28 21:59 UTC

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). RudderStack profile · Recent RudderStack incidents · Markdown · JSON