# Census: Major incident: Sync Alerts missing as of last 2 days

**Summary:** Census reported a major Sync Engine outage from 2024-09-20 20:18 UTC to 2024-09-20 22:55 UTC (2 h 37 min). Sync Alerts had been deleted from its database, preventing email alerts for qualifying sync runs over the prior two days. Alert data was restored, and Census said alerting should work again going forward. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2024-09-20 20:18 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/p2ztdhcc9h62](https://stspg.io/p2ztdhcc9h62)
- [Company: Census](https://rewindex.com/company/census.md)
- Versions: before (none: first archived) → after incident\_version:136/3bwyrjjs2zll@1279a78c5a3a
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Sync Alerts missing as of last 2 days
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2024-09-20 20:18 UTC
```

**5. Added: Resolved time**

```diff
+ 2024-09-20 22:55 UTC
```

**6. Added: Affected components**

```diff
+ Sync Engine
```

**7. Added: Update** (identified) · 2024-09-20 20:18 UTC

```diff
+ Sync Alerts were deleted from our database in the last 2 days. The cause has been identified, and we are working on restoring the deleted alerts.
```

**8. Added: Update** (identified) · 2024-09-20 21:36 UTC

```diff
+ As part of this incident, any sync runs that should have triggered an alert in the last 2 days would not have resulted in an email alert. Once we restore the alert data, any sync runs that fail will trigger an alert, even though the sync may have been failing for the last 2 days. In very rare cases, we may email you at most twice about a failure as we perform the recovery process.
```

**9. Added: Update** (resolved) · 2024-09-20 22:55 UTC

```diff
+ Sync Alert data has been restored. Sync alerting should work again for any syncs that trigger alerts moving forward.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2024-09-20 20:18 UTC | Major incident: Sync Alerts missing as of last 2 days (this change) | outage |

All Census changes: [timeline](https://rewindex.com/company/census/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/i22ce796e6d44ac · Markdown: https://rewindex.com/change/i22ce796e6d44ac.md · JSON: https://rewindex.com/api/v1/changes/i22ce796e6d44ac · Generated 2026-10-18T02:54:53.106Z