Status: Resolved This incident has been resolved. Any updates to static cohorts (including via the API) would have failed silently during this incident. Affected components
 <ul>
 <li>App (Operational)</li>
<li>App (Operational)</li>
 </ul>

Issues adding users to static cohorts

Status: Resolved Mitigation efforts were successfull and the clickhouse infrastructure is serving traffic as expected.

Apologies for the inconveniences. Affected components
 <ul>
 <li>REST API Query endpoints (Operational)</li>
 </ul>

Analytics: query timeouts/failures

Status: Resolved We are fully caught up. No data was lost. Affected components
 <ul>
 <li>Destination Delivery (realtime) (Operational)</li>
 </ul>

Realtime destinations: delivery issues

Status: Resolved We've resolved the issue preventing recording playback in the EU region. Recording ingestion was not impacted and no data has been lost. Affected components
 <ul>
 <li>App (Operational)</li>
 </ul>

Application: partial outage

Status: Resolved This incident was resolved Affected components
 <ul>
 <li>Event and Data Ingestion Success (Operational)</li>
<li>All other REST API endpoints (Operational)</li>
<li>Destination Delivery (batch exports) (Operational)</li>
<li>App (Operational)</li>
<li>REST API Query endpoints (Operational)</li>
<li>Feature Flags API (Operational)</li>
<li>App (Operational)</li>
<li>Data Warehouse Source Ingestion (Operational)</li>
<li>Session Replay Ingestion (Operational)</li>
<li>Event and Data Ingestion Success (Operational)</li>
<li>Data Warehouse Source Ingestion (Operational)</li>
<li>Logs Ingestion (Operational)</li>
<li>Destination Delivery (realtime) (Operational)</li>
<li>REST API Query endpoints (Operational)</li>
<li>Session Replay Ingestion (Operational)</li>
<li>All other REST API endpoints (Operational)</li>
<li>Destination Delivery (batch exports) (Operational)</li>
<li>Logs Ingestion (Operational)</li>
<li>Event and Data Ingestion Lag (Operational)</li>
<li>PostHog.com (Operational)</li>
<li>Destination Delivery (realtime) (Operational)</li>
<li>Event and Data Ingestion Lag (Operational)</li>
<li>Feature Flags API (Operational)</li>
 </ul>

Elevated errors on flags endpoints

Status: Resolved This incident has been resolved. Affected components
 <ul>
 <li>App (Operational)</li>
 </ul>

Status: Resolved We have resolved the underlying issue and events are being processed normally Affected components
 <ul>
 <li>Event and Data Ingestion Lag (Operational)</li>
 </ul>

Event ingestion: processing delays

Status: Resolved This incident has been resolved. Affected components
 <ul>
 <li>Feature Flags API (Operational)</li>
<li>Feature Flags API (Operational)</li>
 </ul>

Feature flags: Issues evaluating flags with cohort dependencies

Status: Resolved The issue is now resolved. Thanks for your patience. Affected components
 <ul>
 <li>App (Operational)</li>
<li>App (Operational)</li>
 </ul>

Session replay playback unavailable

Status: Resolved The MCP is now fully operational.

MCP: elevated API error rates

Status: Resolved After a long period of monitoring, the system remains stable, and as such we are resolving the incident Affected components
 <ul>
 <li>Event and Data Ingestion Lag (Operational)</li>
<li>App (Operational)</li>
 </ul>

Status: Resolved We are fully caught up and processing is back to normal. Affected components
 <ul>
 <li>Destination Delivery (realtime) (Operational)</li>
 </ul>

Realtime destinations: delivery delay

Status: Complete We catched up the lag. Thank you for your patience! Affected components
 <ul>
 <li>Destination Delivery (batch exports) (Operational)</li>
<li>Event and Data Ingestion Lag (Operational)</li>
<li>Destination Delivery (realtime) (Operational)</li>
 </ul>

Maintenance: US: maintenance - event data ingestion

Status: Resolved We have fixed the affected code and all session recordings will start normally. This only affected projects using pinned NPM versions of posthog-js.

The bug meant that for affected deployments sessions did not start and were missed.

Affected sessions were all between March 6th 2100 and March 9th 1235 Affected components
 <ul>
 <li>Session Replay Ingestion (Operational)</li>
<li>Session Replay Ingestion (Operational)</li>
 </ul>

Missing session replays

Status: Resolved The issue has been resolved. Affected components
 <ul>
 <li>Event and Data Ingestion Success (Operational)</li>
<li>Event and Data Ingestion Success (Operational)</li>
 </ul>

Managed reverse proxy stuck in 'loading' or 'issuing' state

Status: Resolved We're up to date with ingestion and everything is functioning as normal. Affected components
 <ul>
 <li>App (Operational)</li>
 </ul>

Status: Resolved Our event ingestion processing has fully caught up to the accumulated lag and all systems are back to fully operational. Affected components
 <ul>
 <li>Event and Data Ingestion Lag (Operational)</li>
 </ul>

Status: Resolved We’ve resolved an issue affecting analytics queries resulting in timeouts and/or failures. Dashboards, insights, and other query-driven views are all operating as expected. There is one bug that we have discovered that causes errors in an edge case and will have a fix out for that soon. Affected components
 <ul>
 <li>App (Operational)</li>
 </ul>

Errors affecting some queries

Status: Resolved The issue has been resolved. Affected components
 <ul>
 <li>App (Operational)</li>
 </ul>

Web app not accessibe

Status: Resolved The load spikes are resolved and the system is operating normally. Affected components
 <ul>
 <li>Event and Data Ingestion Lag (Operational)</li>
<li>App (Operational)</li>
 </ul>

Errors loading some queries / dashboards

Status: Resolved "After provisioning a new database instance API requests responses have returned to normal"

Feature flags API: elevated error rates

Status: Resolved The access to the web application is restored Affected components
 <ul>
 <li>App (Operational)</li>
 </ul>

Status: Resolved Issue in the upstream provider seems to have recovered

PostHog AI: elevated API error rates

Status: Resolved This incident has been resolved. Affected components
 <ul>
 <li>Event and Data Ingestion Lag (Operational)</li>
 </ul>

Status: Resolved All events have been processed and the cluster is operating normally. Affected components
 <ul>
 <li>Event and Data Ingestion Lag (Operational)</li>
 </ul>

Status: Resolved The issue has been resolved. Affected components
 <ul>
 <li>Logs Ingestion (Operational)</li>
 </ul>

Logs ingestion delayed in US Cloud

Status: Resolved We've identified and reverted the problem PR that caused significant load on our cluster. All systems are operating as expected. Enjoy your Wednesday! Affected components
 <ul>
 <li>App (Operational)</li>
 </ul>

Status: Resolved The issue with delays in processing changes to feature flags has been resolved. Affected components
 <ul>
 <li>Feature Flags API (Operational)</li>
 </ul>

Feature Flag Changes Not Taking Hold For Some Teams

Status: Resolved Lag on batch exports has resolved and all systems are operating as expected

Destination batch exports: processing delays

Status: Resolved The issue has been resolved Affected components
 <ul>
 <li>Event and Data Ingestion Lag (Operational)</li>
 </ul>

Logs ingestion: processing delays

Status: Resolved The Feature Flags service has recovered and is operating normally. Elevated error rates and latency have returned to baseline. Affected components
 <ul>
 <li>Feature Flags API (Operational)</li>
 </ul>

Status: Resolved We’re investigating elevated error rates on the feature flags API. Flag evaluations may fail or fall back to default behavior for some requests. Affected components
 <ul>
 <li>Feature Flags API (Operational)</li>
 </ul>

Status: Resolved Everything is running as expected.

We will continue the investigation to understand the root cause and share more details about this incident.

Status: Resolved The issue has been resolved and systems are operating normally. Affected components
 <ul>
 <li>App (Operational)</li>
 </ul>

Errors during session replay playback

Status: Resolved We think the impact from the issue is over.

PostHog AI Conversations Errors

Status: Resolved The impact from the incident has been mitigated for matviews that are not from revenue analytics. We are gradually unpausing schedules for views tied to revenue analytics in the coming days. Affected components
 <ul>
 <li>App (Operational)</li>
<li>App (Operational)</li>
 </ul>

Data modeling sync schedules degraded

Status: Resolved This incident has been resolved.

US Data warehouse sources degraded

Status: Resolved All backfills have now completed successfully and all new batch export runs should be exporting sessions as expected Affected components
 <ul>
 <li>Destination Delivery (realtime) (Operational)</li>
 </ul>

Sessions not being exported since 16th January

Elevated errors in PostHog AI

Status: Resolved Our data processing infrastructure has caught up. Things are back to normal, and no data was lost. Affected components
 <ul>
 <li>Event and Data Ingestion Lag (Operational)</li>
 </ul>

Data Processing Delays - Reporting Tools Affected

Status: Resolved After increasing consumers we have been able to catch up, everything is back to normal now. Affected components
 <ul>
 <li>Event and Data Ingestion Lag (Operational)</li>
<li>Event and Data Ingestion Lag (Operational)</li>
 </ul>

EU Data Processing Delays

Status: Resolved An improvement to the fetch wrapper in posthog-js introduced a bug in processing FormData (for some customers). for the majority of customers there would be no impact which made it slow to detect.

The change has been rolled back and the public post mortem is hosted here

https://github.com/PostHog/post-mortems/blob/web-sdk-incident-january-2026/2026-01-17-replay-sdk-fetch-wrapper-incident.md

posthog-js FormData processing bug

Status: Resolved This incident has been resolved. Affected components
 <ul>
 <li>App (Operational)</li>
<li>REST API Query endpoints (Operational)</li>
<li>REST API Query endpoints (Operational)</li>
<li>App (Operational)</li>
 </ul>

Query errors in US/EU

Status: Resolved This incident has been resolved. Affected components
 <ul>
 <li>Event and Data Ingestion Success (Operational)</li>
<li>Event and Data Ingestion Success (Operational)</li>
 </ul>

Is PostHog down?

PostHog status is UP

Lastest published events

Issues adding users to static cohorts

Analytics: query timeouts/failures

Realtime destinations: delivery issues

PostHog Services, Components and Regions

Recent PostHog events

Issues adding users to static cohorts

Analytics: query timeouts/failures

Realtime destinations: delivery issues

Application: partial outage

Elevated errors on flags endpoints

Analytics: query timeouts/failures

Get your FREE account now,
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Is PostHog down?

PostHog status is UP

Lastest published events

Issues adding users to static cohorts

Analytics: query timeouts/failures

Realtime destinations: delivery issues

PostHog Services, Components and Regions

Recent PostHog events

Issues adding users to static cohorts

Analytics: query timeouts/failures

Realtime destinations: delivery issues

Application: partial outage

Elevated errors on flags endpoints

Analytics: query timeouts/failures

Get your FREE account now,5 monitors included!

Get your FREE account now,
5 monitors included!