# Mattermost: Major incident: Collapse threads are not functional in part of Cloud workspaces

**Summary:** Collapsed threads were not functional in some Mattermost Cloud Workspaces during a major-impact incident that started at 2022-01-26 09:05 UTC and was resolved at 2022-01-26 16:04 UTC, lasting 6 h 59 min. Mattermost reported identifying the root cause and working to mitigate affected workspaces, but did not specify the cause or fix. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2022-01-26 09:05 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/5yzlnr6jvjwt](https://stspg.io/5yzlnr6jvjwt)
- [Company: Mattermost](https://rewindex.com/company/mattermost.md)
- Versions: before (none: first archived) → after incident\_version:106/4c5klpzhgw2p@8dfdc117a207
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Collapse threads are not functional in part of Cloud workspaces
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2022-01-26 09:05 UTC
```

**5. Added: Resolved time**

```diff
+ 2022-01-26 16:04 UTC
```

**6. Added: Affected components**

```diff
+ Cloud Workspaces
```

**7. Added: Update** (investigating) · 2022-01-26 09:05 UTC

```diff
+ We identified the root cause and we are working to mitigate the impacted workspaces
```

**8. Added: Update** (identified) · 2022-01-26 09:07 UTC

```diff
+ We identified the root cause and we are working to mitigate the impacted workspaces.
```

**9. Added: Update** (resolved) · 2022-01-26 16:04 UTC

```diff
+ This incident has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2022-01-26 09:05 UTC | Major incident: Collapse threads are not functional in part of Cloud workspaces (this change) | outage |

All Mattermost changes: [timeline](https://rewindex.com/company/mattermost/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/i918262cf54efbc · Markdown: https://rewindex.com/change/i918262cf54efbc.md · JSON: https://rewindex.com/api/v1/changes/i918262cf54efbc · Generated 2026-10-18T02:54:40.978Z