Outage in PostHog EU
Insights alerts are not being triggered
Resolved Minor
September 09, 2026 - Started 15 days ago
- Lasted about 11 hours
Incident Report
Summary AI Generated
PostHog EU's insight alert scheduler became overloaded by an unbounded batch of due alerts, causing scheduler timeouts and preventing new alert checks from being triggered. The issue affected the App component for approximately 10.6 hours, with alerts failing to send during this period. A fix was deployed to gradually drain the backlog, successfully resolving the issue for nearly all customers.
All but a handful of alerts are caught up. We're working to get those alerts processed now and continuing to monitor. For almost all customers there should be no impact at this time.
Components affected
PostHog EU AppTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
INVESTIGATING
15 days ago - at 09/09/2026 12:32PM
Alerts on insights are not being sent, the team is investigating
IDENTIFIED
15 days ago - at 09/09/2026 01:10PM
We’ve identified that the EU insight alert scheduler is getting overloaded by an unbounded batch of due alerts, which can cause scheduler runs to time out and prevent new alert checks from being scheduled. We have a mitigation ready in PR #97378 . This is intended to let the EU cluster drain the backlog gradually once deployed.
MONITORING
14 days ago - at 09/09/2026 03:21PM
The fix to unblock the backlog is now deployed and in-progress. We're continuing to monitor the issue.
MONITORING
14 days ago - at 09/09/2026 06:56PM
All but a handful of alerts are caught up. We're working to get those alerts processed now and continuing to monitor. For almost all customers there should be no impact at this time.
Latest PostHog EU outages
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Some warehouse sources are failing to sync - 14 days ago
Realtime destinations: delivery issues - 16 days ago
Application: elevated Scout API error rates - 22 days ago
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