PostHog EU Outage History

PostHog EU experienced a 7.3-hour event ingestion pipeline delay that caused events to take longer than usual to appear in the product and affected queries within PostHog apps. A fix was identified and deployed, with event ingestion catch-up initiated to process the backlog. No data was lost during the incident, though visibility of events was temporarily impacted until processing delays were resolved.

PostHog EU experienced an issue where LLM analytics traces older than approximately 17 hours failed to load in the dashboard, displaying "trace not found" errors instead. The problem affected the main application component and prevented users from accessing historical LLM trace data. The issue was resolved after 34 minutes with a fix implemented and monitoring in place.

PostHog EU's Feature Flags API experienced elevated latency and error rates for 3.6 hours, causing flag evaluations to fail or fall back to default behavior for some requests. The issue was identified within 13 minutes of detection, and a fix was deployed that restored normal metrics. The incident was classified as minor and is now resolved with continued monitoring.

An attacker exploited PostHog EU's invite system to send phishing emails containing malicious links between April 22-24, affecting users who received unexpected invite emails. PostHog deployed a fix to prevent further abuse, blocked the attacker, and confirmed no compromise of their data or systems occurred. The incident was resolved after 12.9 hours with continued monitoring for additional malicious activity.

PostHog EU experienced an issue where session replays were stuck buffering for 11.2 hours, affecting the App component. The team identified and deployed a fix, with replays returning to normal buffering functionality and no data loss occurring.