# Mux: Major incident: Mux Data beacon collection issues

**Summary:** Mux reported a major Mux Data - Data Collection incident starting 2026-07-01 22:35 UTC, resolved 2026-07-02 01:13 UTC (2 h 37 min). View session data was delayed for a subset of customers between 22:12 UTC - 22:44 UTC, with no data loss. A fix was implemented. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-07-01 22:35 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/cy4jx78z0yv1](https://stspg.io/cy4jx78z0yv1)
- [Company: Mux](https://rewindex.com/company/mux.md)
- Versions: before (none: first archived) → after incident\_version:197/cd64dbtncxhy@518d5e4296ec
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Mux Data beacon collection issues
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-07-01 22:35 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-07-02 01:13 UTC
```

**6. Added: Affected components**

```diff
+ Mux Data - Data Collection
```

**7. Added: Update** (investigating) · 2026-07-01 22:35 UTC

```diff
+ We are investigating an issue with collecting Mux data beacons. Beginning 22:12 UTC, view session data will be delayed.
```

**8. Added: Update** (monitoring) · 2026-07-01 22:50 UTC

```diff
+ A fix has been implemented and we are monitoring results. Delayed data was for a subset of customers between 22:12 UTC - 22:44 UTC. No data loss.
```

**9. Added: Update** (resolved) · 2026-07-02 01:13 UTC

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

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-07-01 22:35 UTC | Major incident: Mux Data beacon collection issues (this change) | degradation |

All Mux changes: [timeline](https://rewindex.com/company/mux/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/i5819fe3adabc05 · Markdown: https://rewindex.com/change/i5819fe3adabc05.md · JSON: https://rewindex.com/api/v1/changes/i5819fe3adabc05 · Generated 2026-10-18T03:25:04.039Z