# Amplitude: Major incident: Experiment Management API Degradation

**Summary:** Amplitude’s Experiment Flags Management API (/api/1/flags) returned incomplete or empty flag listings; UI flags and /api/1/experiments were unaffected. The major incident started 2026-03-20 17:31 UTC, with symptoms reported since 16:00 UTC; it lasted 2 h 28 min and resolved at 2026-03-20 20:00 UTC after a verified fix. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-03-20 17:31 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/mxn1b08yxvtl](https://stspg.io/mxn1b08yxvtl)
- [Company: Amplitude](https://rewindex.com/company/amplitude.md)
- Versions: before (none: first archived) → after incident\_version:49/x2y74vn32bpp@885c632a48e1
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Experiment Management API Degradation
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-03-20 17:31 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-03-20 20:00 UTC
```

**6. Added: Affected components**

```diff
+ Experiment - Management API, Management API
```

**7. Added: Update** (identified) · 2026-03-20 17:31 UTC

```diff
+ Since 2026-03-20 approximately 09:00 AM PT (16:00 UTC), the Experiment Flags Management API (/api/1/flags) has been returning incomplete results. Customers using the Flags Management API may see empty responses when listing feature flags, even though flags remain visible and functional in the Amplitude UI. The Experiments API (/api/1/experiments) is not affected. Our team has identified the root cause and a fix has been deployed. We are monitoring the rollout to confirm the issue is fully resolved. No data has been lost, and flags continue to evaluate correctly for end users. No customer action is needed at this time. We will provide the next update by 2026-03-20 12:00 PM PT (19:00 UTC).
```

**8. Added: Update** (monitoring) · 2026-03-20 19:13 UTC

```diff
+ We have verified the fix, and the management-api is now fully operational. We will remain in a period of active monitoring to ensure continued stability.
```

**9. Added: Update** (resolved) · 2026-03-20 20:00 UTC

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

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-03-20 17:31 UTC | Major incident: Experiment Management API Degradation (this change) | degradation |

All Amplitude changes: [timeline](https://rewindex.com/company/amplitude/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/i09b917d9671a46 · Markdown: https://rewindex.com/change/i09b917d9671a46.md · JSON: https://rewindex.com/api/v1/changes/i09b917d9671a46 · Generated 2026-10-18T01:54:25.989Z