# RudderStack: Major incident: Issues with python transformations in US.

**Summary:** RudderStack reported a major outage affecting Python Transformations in the US from 2025-10-20 15:32 UTC to 2025-10-20 21:51 UTC (6 h 18 min). The vendor attributed the issues to an ongoing AWS incident and limited AWS resources; increased EC2 instance launches restored capacity, and all backlog was cleared with no lingering customer impact reported. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2025-10-20 15:32 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/qdc8lq8mm1vg](https://stspg.io/qdc8lq8mm1vg)
- [Company: RudderStack](https://rewindex.com/company/rudderstack.md)
- Versions: before (none: first archived) → after incident\_version:161/m7xvytdskbv1@834e795b0fd2
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Issues with python transformations in US.
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2025-10-20 15:32 UTC
```

**5. Added: Resolved time**

```diff
+ 2025-10-20 21:51 UTC
```

**6. Added: Affected components**

```diff
+ Data Processing Pipeline - Data Processing Pipeline (US), Data Processing Pipeline (US)
```

**7. Added: Update** (identified) · 2025-10-20 15:32 UTC

```diff
+ RudderStack is actively working to resolve the issues caused by the ongoing AWS incident. Currently, customers in US using Python Transformations are impacted, and we are focused on restoring this feature as soon as possible. Our efforts are currently constrained by limited AWS resource availability, but we are exploring multiple options to restore full functionality. We will share another update as soon as we have more information.
```

**8. Added: Update** (monitoring) · 2025-10-20 19:06 UTC

```diff
+ We are seeing successful increased launches of new EC2 instances and thus able to resource python transformations. We will be monitoring till all the backlog is cleared
```

**9. Added: Update** (resolved) · 2025-10-20 21:51 UTC

```diff
+ RudderStack has cleared all backlog across all the python transformations. We do not see any lingering impact to customers. If you have questions contact your account team
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2025-10-20 15:32 UTC | Major incident: Issues with python transformations in US. (this change) | outage |

All RudderStack changes: [timeline](https://rewindex.com/company/rudderstack/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/i2b75f0617c25f7 · Markdown: https://rewindex.com/change/i2b75f0617c25f7.md · JSON: https://rewindex.com/api/v1/changes/i2b75f0617c25f7 · Generated 2026-10-18T03:55:42.411Z