Outage in PostHog

Query performance degraded in US

Resolved Minor

December 16, 2025 - Started about 1 month ago - Lasted about 1 hour
Official incident page

Incident Report

We have spotted a huge load spike in our ClickHouse cluster and we are investigating the root cause. Query performance is degraded and the app may not respond as expected.

Components affected

PostHog App

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Latest Updates ( sorted recent to last )

RESOLVED about 1 month ago - at 12/16/2025 02:11PM

We were able to identify the workload causing the issue and mitigated it.

Queries should now respond as expected.

INVESTIGATING about 1 month ago - at 12/16/2025 12:50PM

We have spotted a huge load spike in our ClickHouse cluster and we are investigating the root cause.

Query performance is degraded and the app may not respond as expected.

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