Outage in PostHog US
Feature flags: Issues evaluating flags with cohort dependencies
Resolved Minor
March 17, 2026 - Started about 1 month ago
- Lasted about 1 hour
Incident Report
Summary AI Generated
PostHog experienced issues with cohort calculations that caused feature flags dependent on those cohorts to incorrectly evaluate as false. The problem affected feature flag functionality for users relying on cohort-based targeting. The issue was resolved after 1.3 hours when a fix was implemented to restore correct feature flag evaluations.
We're investigating reports that some cohorts are calculating incorrectly. This has a knock-on effect for feature flags that depend on the failing cohorts, causing them to evaluate false.
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Latest Updates ( sorted recent to last )
MONITORING
about 1 month ago - at 03/17/2026 11:37AM
We've implemented a fix, and feature flag evaluations are working correctly again. We're continuing to monitor the results.
INVESTIGATING
about 1 month ago - at 03/17/2026 10:35AM
We're investigating reports that some cohorts are calculating incorrectly. This has a knock-on effect for feature flags that depend on the failing cohorts, causing them to evaluate false.
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