# Astronomer: Major incident: Incorrect scheduler heartbeat metrics being reported

**Summary:** Astronomer reported a major degradation from 2026-08-18 18:51 UTC to 2026-09-10 22:19 UTC, lasting 23 days 3 h. A metrics reporting bug falsely flagged missed scheduler heartbeats, affecting Astro UI dashboard and monitoring visibility; task execution, scheduling, and workflow processing were unaffected. Astronomer reported rolling out a fix and later marked the issue resolved. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-08-18 18:51 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://status.astronomer.io/incidents/01M0B3EMK58DTX2DW16S9RNHV5](https://status.astronomer.io/incidents/01M0B3EMK58DTX2DW16S9RNHV5)
- [Company: Astronomer](https://rewindex.com/company/astronomer.md)
- Versions: before (none: first archived) → after incident\_version:135/01M0B3EMK58DTX2DW16S9RNHV5@6a43c07033e4
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Incorrect scheduler heartbeat metrics being reported
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-08-18 18:51 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-09-10 22:19 UTC
```

**6. Added: Update** (investigating) · 2026-08-18 18:51 UTC

```diff
+ Our metrics pipeline is falsely displaying spikes in scheduler heartbeat metrics, despite underlying component health.
```

**7. Added: Update** (identified) · 2026-09-08 18:31 UTC

```diff
+ We've identified the cause of the false availability alerts that have been showing the Astro UI. This is a degradation affecting dashboard and monitoring visibility only. Task execution, scheduling, and workflow processing have not been impacted. The issue is the result of a metrics reporting bug that has been intermittently flagging scheduler heartbeats as missed when they were not. We are actively rolling out a fix that corrects how these metrics are reported.
```

**8. Added: Update** (resolved) · 2026-09-10 22:19 UTC

```diff
+ This issue is now resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-08-18 18:51 UTC | Major incident: Incorrect scheduler heartbeat metrics being reported (this change) | degradation |

All Astronomer changes: [timeline](https://rewindex.com/company/astronomer/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/i7392cca36e15fa · Markdown: https://rewindex.com/change/i7392cca36e15fa.md · JSON: https://rewindex.com/api/v1/changes/i7392cca36e15fa · Generated 2026-10-18T02:29:16.247Z