Piano.io incident

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

Notice Resolved View vendor source →

Piano.io experienced a notice incident on October 29, 2025 affecting Composer Experience Execution - US and Composer Experience Execution - Europe, lasting —. The incident has been resolved; the full update timeline is below.

Started
Oct 29, 2025, 07:27 AM UTC
Resolved
Oct 29, 2025, 07:27 AM UTC
Duration
—
Detected by Pingoru
Oct 29, 2025, 07:27 AM UTC

Affected components

Composer Experience Execution - USComposer Experience Execution - Europe

Update timeline

  1. 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.