Amplitude: Experiment Management API Degradation

Impact: majorStatus: resolvedStarted 2026-03-20 17:31 UTCResolved 2026-03-20 20:00 UTC (2.5 h)3 updatesSource: stspg.io

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 archived incident (Sol). Check the timeline before relying on it.

Affected components: Experiment - Management APIManagement API

Timeline of updates

identified2026-03-20 17:31 UTC
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).
monitoring2026-03-20 19:13 UTC
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.
resolved2026-03-20 20:00 UTC
This incident has been resolved.

Rewindex changes for this incident

Major incident: Experiment Management API Degradation 2026-03-20 17:31 UTC

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Amplitude profile · Recent Amplitude incidents · Markdown · JSON