Mixpanel outage: Degraded Query API Performance impacting US Projects

Affected components

• Application Availability (US)

1. postmortemSep 8, 2026, 18:25 UTC

   # Mixpanel RCA: Temporary Query Service Disruption for US Projects August 26, 2026 # Summary Between approximately **2:02 PM and 3:19 PM PT on August 26, 2026**, projects in the US region experienced failures loading reports and running queries through the Mixpanel UI and Query API. During this window, some queries in the region failed or returned errors. **No customer data was lost, and data ingestion was not affected.** All events continued to be collected and stored normally throughout the incident; once query service was restored, all reports reflected complete, accurate data with no customer action required. The cause was identified as a recently deployed internal tool for diagnostic query replay, a capability our engineers use to re-run copies of past queries to debug performance, which unexpectedly wrote large amounts of data to the disks of our query servers, consuming storage capacity the servers need to operate. When those disks filled, the affected servers took themselves

2. resolvedAug 26, 2026, 22:45 UTC

   This incident has been resolved.

3. monitoringAug 26, 2026, 22:28 UTC

   A fix has been implemented, and we're seeing improved success rates for the Query API. We will continue monitoring to ensure stability.

4. identifiedAug 26, 2026, 22:11 UTC

   The issue has been identified and a fix is being implemented.

5. investigatingAug 26, 2026, 21:39 UTC

   Mixpanel is experiencing degraded Query API performance, resulting in HTTP 500 responses when querying reports for projects with US Data Residency. Projects with EU and IN Data Residency remain unaffected. We appreciate your patience while our engineers work to restore normal functionality. We will post progress updates on our status page. If you have any questions, please <a href="https://mixpanel.com/get-support">contact support.</a>

What APIStatus.watch saw

Our 5-minute checks didn't record a change in Mixpanel's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.

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How often does Mixpanel have incidents?

Mixpanel reported 4 incidents in the last 90 days, 2 of them major or critical. A typical incident lasted 4h 59m. See Mixpanel's uptime and incident history