Outage in PostHog

US: Delayed event ingestion

Resolved Minor
May 15, 2025 - Started 13 days ago - Lasted about 22 hours
Official incident page

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Outage Details

There were some recurring errors in our infrastructure that led us to restart clickhouse nodes. We are falling behind on events ingestion, as we are replacing some nodes in our ClickHouse cluster. This will increase lag in our ingestion pipeline. Performance may be impacted during this time too. We are still working on this and monitoring it.
Components affected
PostHog Event and Data Ingestion
Latest Updates ( sorted recent to last )
RESOLVED 12 days ago - at 05/16/2025 07:18PM

We've caught up on our backlog of messages. Ingestion rates look optimal. Parts are being merged as they should. New nodes are fully online. Query latencies are looking great at 100ms avg. Should be smooth sailing from here on out. Enjoy your Friday!

MONITORING 13 days ago - at 05/15/2025 09:26PM

There were some recurring errors in our infrastructure that led us to restart clickhouse nodes.

We are falling behind on events ingestion, as we are replacing some nodes in our ClickHouse cluster. This will increase lag in our ingestion pipeline.
Performance may be impacted during this time too. We are still working on this and monitoring it.

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