Realtime destinations: delivery issues
The issue was fixed and everything is back to normal. The impacted customers will be informed.
The latest update from PostHog.
State
Resolved
Started
54 d ago
2026-09-08 09:39 UTC
Lasted
2 h 40 min
until 2026-09-08 12:19 UTC
Worst impact
Partial outage
Timeline
3 updatesIdentified
58 min 36%
Monitoring
1 h 42 min 64%
Updates
Times in UTCAs posted by PostHog
The issue was fixed and everything is back to normal. The impacted customers will be informed.
We've identified the root cause: a recent change to Hog function validation was stricter than intended and caused some valid destinations and transformations to fail. When this happens, matching events aren't forwarded to the destination and those deliveries can't be replayed - the events themselves remain safely in PostHog, but the forwarding for the affected window is lost. Only a very small number of customers were affected. We've pulled the complete lists of impacted teams and functions in EU and US to start outbound communication. A fix has been merged that restores the previous behaviour and stops new failures once deployed. We're also scoping a longer-term mechanism to make this class of failure recoverable in the future.
A breaking change in our HogVM caused some destinations to fail. We currently identified the issue and preparing a fix to mitigate the issue.
Affected components
1PostHog in the last 90 days
Full historyIncidents in 90 days
28
Days with an incident
22
Median duration
1 h 14 min
This incident
2.2× the median
Other PostHog incidents
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All services have returned to normal.
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We've released a fix for this - affected Google Ads tables will catch up automatically at their next scheduled sync, or you can trigger a refresh manually to update the tables sooner.
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Warehouse sources backlog has been processed
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