FME metrics impact calculations are not updating

Incident Report for Harness

Postmortem

Summary

April 13, 2026, FME metrics impact calculations experienced calculations not updated. The root cause was determined to be due to a bug introduced in the software upgrade / release process.

Root Cause

An internal library upgrade included in the release caused a runtime issue is a legacy execution pathway.

Impact

Feature flag metrics impact calculations were not updating. This issue does not impact experiment calculation, and there is no data loss.

Mitigation

To mitigate we immediately rolled back the update.

Action Items

To prevent such issues from happening again, we are working on fixing gaps in monitoring and alerting for the metrics impact calculations flow.

Posted Apr 20, 2026 - 08:57 PDT

Resolved

After monitoring post fixing the issue, all systems are back to normal and processing metrics impact calculations regularly. We will provide an RCA soon.

Posted Apr 13, 2026 - 10:31 PDT

Monitoring

Feature flag metrics impact calculations were not updating. This issue does not impact experiment calculation. Fix is being rolled out. There is no data loss.

Posted Apr 13, 2026 - 09:47 PDT

This incident affected: Feature Management & Experimentation (FME) (Data processing).