# Klaviyo: Major incident: Template Cloning Functionality

**Summary:** Klaviyo reported a major incident affecting template cloning from the Template Library (Email Sending - Email Content), starting 2025-12-17 01:11 UTC and resolved at 2025-12-17 01:49 UTC (37 min). Engineering identified the cause, began implementing a fix, and later confirmed template cloning was fully restored. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2025-12-17 01:11 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/sbxykr03wrs0](https://stspg.io/sbxykr03wrs0)
- [Company: Klaviyo](https://rewindex.com/company/klaviyo.md)
- Versions: before (none: first archived) → after incident\_version:249/r62mb32zztb1@9d091ce39d5b
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Template Cloning Functionality
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2025-12-17 01:11 UTC
```

**5. Added: Resolved time**

```diff
+ 2025-12-17 01:49 UTC
```

**6. Added: Affected components**

```diff
+ Email Sending - Email Content
```

**7. Added: Update** (monitoring) · 2025-12-17 01:11 UTC

```diff
+ Beginning around 6:42 PM US/Eastern on 12/16/2025, customers may have noticed an issue with cloning templates from the Template Library. Our engineering team has identified the cause of this issue and is implementing a fix to restore functionality. We'll provide updates as soon as more information is available.
```

**8. Added: Update** (resolved) · 2025-12-17 01:49 UTC

```diff
+ As of 8:23 PM US/Eastern on 12/16/2025, this incident has been resolved and template cloning functionality has been fully restored.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2025-12-17 01:11 UTC | Major incident: Template Cloning Functionality (this change) | outage |

All Klaviyo changes: [timeline](https://rewindex.com/company/klaviyo/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/ie9200faa30cff9 · Markdown: https://rewindex.com/change/ie9200faa30cff9.md · JSON: https://rewindex.com/api/v1/changes/ie9200faa30cff9 · Generated 2026-10-18T01:54:24.780Z