ChangesHarnessFeature Management & Experimentation (FME) user interface unavailable
Harness: Major incident: Feature Management & Experimentation (FME) user interface unavailable
Summary
Summary pending. The diff below shows exactly what changed.
Incident page: the full timeline of updates
What changed
Struck in red is what Harness removed; blue is what they added. Muted text is unchanged context.
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After: Feature Management & Experimentation (FME) user interface unavailable
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After: major
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After: postmortem
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After: 2026-08-24 00:57 UTC
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After: 2026-08-24 01:12 UTC
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After: FME, Prod 1 - FME
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After: We are currently investigating this issue.
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After: We are currently investigating reports that the Feature Management & Experimentation (FME) user interface is failing to load. Customers attempting to access the FME console may encounter errors or unresponsive pages. Feature flag evaluation and SDK traffic are not believed to be affected. A further update will follow shortly.
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After: A fix has been implemented and we are monitoring the results.
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After: This incident has been resolved.
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After: ## Summary
* Starting at **23:42 UTC** on August 23, 2026, several FME customers reported failures loading the FME UI.
* FME UI Artifacts served from the CDN expired due to a retention policy, causing FME UI to fail to load.
* Any flag request changes through the API, change delivery, and the data pipeline continued to work with no interruption.
## Root Cause
* The FME UI is served from a CDN. The UI artifacts got evicted due to a retention policy, causing the UI to fail to load for all users.
## Impact
* The FME UI was unable to load for all users across all production environments.
### What was not impacted?
* SDK functionality and runtime flag evaluation
* Admin API calls
* Customer flag configuration data
* No data loss occurred
## Remediation
* FME UI got restored in the CDN through a deployment
* Recovery confirmed across all production environments before closing the incident.
## Action Items
* Improve the asset retention policy so that the currently active version is never subject to eviction.
First version of this incident archived by Rewindex. View the live incident (opens in new tab).
History of this incident
Monday, August 24
1 incident change
- MajorMajor incident
Feature Management & Experimentation (FME) user interface unavailablethis change