# Sentry: Critical incident: EU Region Error, Attachment, and Feedback latency

**Summary:** Sentry reported a critical EU-region incident causing high ingestion latency for errors, attachments, and feedback from 2026-07-20 11:11 UTC to 2026-07-20 16:57 UTC, lasting 5 h 46 min. Sentry implemented an attachment ingestion fix and cleared attachment and error backlogs; latency returned to normal across all event types. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-07-20 11:11 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/0k3pvpywznz6](https://stspg.io/0k3pvpywznz6)
- [Company: Sentry](https://rewindex.com/company/sentry.md)
- Versions: before (none: first archived) → after incident\_version:288/lnsbtfnj7wqz@05581dc8c6db
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ EU Region Error, Attachment, and Feedback latency
```

**2. Added: Impact**

```diff
+ critical
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-07-20 11:11 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-07-20 16:57 UTC
```

**6. Added: Affected components**

```diff
+ Alerting - EU Errors Alerting, EU Ingestion - EU Attachment Ingestion, EU Ingestion - EU Error Ingestion
```

**7. Added: Update** (investigating) · 2026-07-20 11:11 UTC

```diff
+ we are investigating an issue affecting errors ingestion in the DE/EU region
```

**8. Added: Update** (identified) · 2026-07-20 11:41 UTC

```diff
+ We have identified the issue causing errors, attachments, and feedback events to have high ingest latency in our EU region and are working on a fix.
```

**9. Added: Update** (identified) · 2026-07-20 12:10 UTC

```diff
+ We have identified the issue causing errors, attachments, and feedback events to have high ingest latency in our EU region and are continuing to work on a fix.
```

**10. Added: Update** (identified) · 2026-07-20 12:24 UTC

```diff
+ We have identified the issue causing errors, attachments, and feedback events to have high ingest latency in our EU region and are continuing to work on a fix.
```

**11. Added: Update** (identified) · 2026-07-20 13:19 UTC

```diff
+ We have identified the issue causing errors, attachments, and feedback events to have high ingest latency in our EU region and are continuing to work on a fix.
```

**12. Added: Update** (identified) · 2026-07-20 13:47 UTC

```diff
+ We have implemented a fix for errors and feedback ingestion in our EU region, and latency for those pipelines has returned to normal. We are still working on fixing our attachments ingestion pipeline in EU.
```

**13. Added: Update** (monitoring) · 2026-07-20 14:30 UTC

```diff
+ We have implemented a fix for our attachment ingestion issue in our EU region, and are monitoring while the backlog burns. We will update here when latency is back to normal.
```

**14. Added: Update** (monitoring) · 2026-07-20 14:50 UTC

```diff
+ The backlog on attachments in our EU region is fully burned, and latency is back to normal. While new error events are being processed with normal latency, we have a backlog of old error events that we are now burning through.
```

**15. Added: Update** (monitoring) · 2026-07-20 16:09 UTC

```diff
+ We are still burning the backlog of EU region error events received during the incident. We are around halfway through the backlog.
```

**16. Added: Update** (resolved) · 2026-07-20 16:57 UTC

```diff
+ We have fully burned the backlog of EU error events ingested during the incident. Latency is normal across all event types.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-07-20 11:11 UTC | Critical incident: EU Region Error, Attachment, and Feedback latency (this change) | degradation |

All Sentry changes: [timeline](https://rewindex.com/company/sentry/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i5ab1635aad7e76 · Markdown: https://rewindex.com/change/i5ab1635aad7e76.md · JSON: https://rewindex.com/api/v1/changes/i5ab1635aad7e76 · Generated 2026-10-18T02:55:21.663Z