Resolved after 17 hours 17 minutes, affecting EU Cloud 🇪🇺 (App (Web & Desktop)), on September 9, 2026.
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.
Affected components
Update timeline
- investigating Sep 09, 2026, 12:32 PM UTC
Alerts on insights are not being sent, the team is investigating
- identified Sep 09, 2026, 01:10 PM UTC
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: https://github.com/PostHog/posthog/pull/97378. This is intended to let the EU cluster drain the backlog gradually once deployed.
- monitoring Sep 09, 2026, 03:21 PM UTC
The fix to unblock the backlog is now deployed and in-progress. We're continuing to monitor the issue.
- monitoring Sep 09, 2026, 06:56 PM UTC
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.
- resolved Sep 09, 2026, 11:06 PM UTC
The fix has been fully deployed, and alerts on insights are back to normal.
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