Outage in PostHog

Performance degraded in US

Resolved Major
August 21, 2025 - Started about 1 month ago - Lasted about 2 hours
Official incident page

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Outage Details

Our ClickHouse cluster is pretty loaded right now and queries may be pretty slow to complete or not be able to complete at all. We are investigating what could be the issue.
Components affected
PostHog App PostHog Event and Data Ingestion
Latest Updates ( sorted recent to last )
RESOLVED about 1 month ago - at 08/21/2025 06:45PM

Batch exports caught up and everything is now back to normal.

MONITORING about 1 month ago - at 08/21/2025 06:23PM

We fixed the root cause that was exhausting ClickHouse connections and we are now recovering.

Ingestion lag is fully recovered, and queries are starting to respond as usual again.

We are still monitoring batch exports.

INVESTIGATING about 1 month ago - at 08/21/2025 04:47PM

We've spotted that something has gone wrong. We're currently investigating the issue, and will provide an update soon.

INVESTIGATING about 1 month ago - at 08/21/2025 04:38PM

We've spotted that something has gone wrong. We're currently investigating the issue, and will provide an update soon.

INVESTIGATING about 1 month ago - at 08/21/2025 04:37PM

Our ClickHouse cluster is pretty loaded right now and queries may be pretty slow to complete or not be able to complete at all.

We are investigating what could be the issue.

Latest PostHog outages

Elevated API Errors - 3 days ago
US: elevated error rate web portal and api - 3 days ago
Event querying errors - 9 days ago
ClickHouse offline node is down in PostHog US - 10 days ago
US Cloud Web App Down - 14 days ago

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