Changes / Amplitude / Experiment Management API Degradation
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 from the diff below (Sol; type: incident degradation). Check the diff before relying on it.
Major incidentLabel: degradation (model (Jev), 95%)Changed Detected Source: stspg.io (opens in new tab)
What changed
Before: not present
After: Experiment Management API Degradation
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After: major
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After: resolved
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After: 2026-03-20 17:31 UTC
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After: 2026-03-20 20:00 UTC
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After: Experiment - Management API, Management API
Before: not present
After: 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).
Before: not present
After: 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.
Before: not present
After: This incident has been resolved.
First version of this incident archived by Rewindex. View the live incident (opens in new tab).
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Major incident: Experiment Management API Degradation (this change) 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. | Major incident |
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