Elevated 400 errors for Server Composer Experiences (US & EU regions)

Incident Report for Piano Software

Resolved

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.

Posted Oct 29, 2025 - 07:27 UTC

This incident affected: Composer Experience Execution (Composer Experience Execution - US, Composer Experience Execution - Europe).