Outage in PostHog
Feature flags: Issues evaluating flags with cohort dependencies
Resolved Minor
March 17, 2026 - Started about 9 hours 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.
Need to monitor PostHog outages?
- Monitor all your external dependencies in one place
- Get instant alerts when outages are detected
- Be the first to know if service is down
- Show real-time status on private or public status page
- Keep your team informed
Latest Updates ( sorted recent to last )
MONITORING
about 8 hours 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 9 hours 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.
Latest PostHog outages
Session replay playback unavailable - 1 day ago
MCP: elevated API error rates - 1 day ago
Analytics: query timeouts/failures - 7 days ago
Realtime destinations: delivery delay - 7 days ago
Missing session replays - 8 days ago
The Status Page Aggregator with Early Outage Detection
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
Start free trialNo credit card required · Cancel anytime · 6020 services available
Integrations with
