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Outage in LaunchDarkly

Issue with Experiment Results in case of Flag Variation edits

Resolved Minor
April 29, 2026 - Started 3 days ago - Lasted 1 day
Official incident page

Incident Report

Summary AI Generated

LaunchDarkly experienced an issue where editing flag variations between experiment iterations caused sample ratio mismatches (SRMs) or empty experiment results for some customers. The service implemented a fix to prevent the issue in new experiments and then validated a complete resolution for all affected experiments. The incident lasted 27.9 hours and impacted only a small subset of experimentation customers.

We are aware of an issue affecting some customers that may result in sample ratio mismatches (SRMs) or empty experiment results if flag variations are edited between experiment iterations.

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Latest Updates ( sorted recent to last )
RESOLVED 1 day ago - at 05/01/2026 12:09AM

We have validated a fix to resolve all remaining experiments with inaccurate sample ratio mismatches (SRMs) or empty experiment results. The vast majority of experiments and experimentation customers were not impacted.

MONITORING 3 days ago - at 04/30/2026 12:04AM

We've released a fix to prevent this issue in new experiments and iterations. We're working to resolve this issue for experiment data recently processed.

IDENTIFIED 3 days ago - at 04/29/2026 08:49PM

We've identified the issue and are implementing a fix for this behavior.

INVESTIGATING 3 days ago - at 04/29/2026 08:19PM

We are aware of an issue affecting some customers that may result in sample ratio mismatches (SRMs) or empty experiment results if flag variations are edited between experiment iterations.

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