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Outage in PostHog US

US degraded performance

Resolved Major
May 12, 2025 - Started 12 months ago - Lasted about 13 hours
Official incident page

Incident Report

We have detected a partial outage in our ClickHouse cluster and it's impacting the application response and performance getting insights. We are investigating the root cause.

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Latest Updates ( sorted recent to last )
RESOLVED 12 months ago - at 05/13/2025 07:03AM

Lag has recovered and the system is completely functional again.

Sorry for any inconvenience caused by this incident.

MONITORING 12 months ago - at 05/12/2025 09:56PM

The cluster is now responsive and the data ingestion has been resumed. The app is responding better now.

We are still monitoring a couple of fixes we have pushed. We identified a query that was flooding the cluster and which may have been the root cause of this.

INVESTIGATING 12 months ago - at 05/12/2025 09:10PM

We have recovered a good part of the cluster, but we are still working to bring it back completely.

The performance may be still degraded. We think some problematic queries may have been the root cause, we are still investigating it.

INVESTIGATING 12 months ago - at 05/12/2025 08:05PM

We are trying to bring back the cluster.

The app may be completely unresponsive, and lag is expected during this time, we'll try to provide an update as soon as possible.

INVESTIGATING 12 months ago - at 05/12/2025 06:41PM

We have detected a partial outage in our ClickHouse cluster and it's impacting the application response and performance getting insights.

We are investigating the root cause.

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