Piano.io incident
Elevated 400 errors for Server Composer Experiences (US & EU regions)
Resolved on October 29, 2025, affecting Composer Experience Execution - US and Composer Experience Execution - Europe.
Piano detected elevated 400 errors on API Interaction for Server Composer Experiences between 6:22 AM - 6:43 AM UTC in the US and EU regions. This was caused by a new release that introduced a serialization logic change, resulting in unexpected object graph handling. The issue was auto-detected and immediately resolved via our monitoring system. We apologize for any inconvenience caused and will enhance automated smoke testing for server-side experiences to prevent similar issues.
Affected components
Update timeline
- resolved Oct 29, 2025, 07:27 AM UTC
Piano detected elevated 400 errors on API Interaction for Server Composer Experiences between 6:22 AM - 6:43 AM UTC in the US and EU regions. This was caused by a new release that introduced a serialization logic change, resulting in unexpected object graph handling. The issue was auto-detected and immediately resolved via our monitoring system. We apologize for any inconvenience caused and will enhance automated smoke testing for server-side experiences to prevent similar issues.
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