Experiment Data Missing for Some Experiment Iterations

Update timeline

1. investigating Mar 18, 2026, 02:07 AM UTC

   We are aware of an issue affecting experiment reporting data for a subset of accounts. Affected users may see incomplete data for some experiment iterations in the UI.

2. identified Mar 18, 2026, 02:08 AM UTC

   The issue has been identified and a fix is being implemented.

3. identified Mar 18, 2026, 04:17 AM UTC

   We have implemented a mitigation that restores data availability for all current experiment iterations. Affected accounts should now see up-to-date reporting and exposure data in the UI. Our team continues to work on restoring data for previously affected experiment iterations. We will provide a further update once full historical data recovery is complete.

4. identified Mar 18, 2026, 10:37 PM UTC

   Our team continues to work on restoring data for previously affected experiment iterations. We will provide a further update once full historical data recovery is complete.

5. identified Mar 19, 2026, 04:52 AM UTC

   Our team continues to work on restoring data for previously affected experiment iterations. Complete data restoration expected by tomorrow.

6. resolved Mar 20, 2026, 12:29 AM UTC

   Our team completed the data restoration for previously affected experiment iterations. Complete data is now available for all experiment iterations in the UI.