Major incident

Cornerstone: Development Plans – Functional Issues and Errors in Production (All Swimlanes)

Affected: Response Time, Response Time, Response Time, Response Time, Response Time, Response Time, Response Time, Response Time, Response Time, Response Time, Response Time, Response Time, Response Time, Response Time

Current status of Cornerstone: Operational — live Cornerstone status

Timeline

1. Sep 29, 2026, 11:14 UTC
   investigating
   Clients may experience functional issues when using Development Plans in Production, including errors or delays when performing certain tasks. Our Engineering Team is actively working with the appropriate domain team to identify the underlying cause and resolve the issue as quickly as possible. This is being treated as a high priority. Please check back periodically for additional updates, which will be posted as they become available.
2. Sep 29, 2026, 12:09 UTC
   resolved
   Our Engineering Team has confirmed the issue to be resolved. Thank you for your patience and understanding!
3. Oct 22, 2026, 19:14 UTC
   postmortem
   **Issue Summary:** On September 29, 2026, users across all Production regions experienced errors when accessing the Development Plan functionality within Guide. Affected users were temporarily unable to access or use the Development Plan functionality during the incident window. **Root Cause:** The issue was caused by an application initialization failure following a recent framework update. As a result, certain components required by the Development Plan service did not initialize correctly, leading to application errors and disruption of the affected functionality. **Corrective Action:** Cornerstone updated the affected software dependencies to address the initialization failure and restore normal operation of the Development Plan service. Following these changes, the required service components initialized successfully, allowing the affected functionality to resume normal operation. **Preventive Measures:** To reduce the risk of a similar issue, Cornerstone has taken the following action: * Implemented end-to-end testing to validate core API functionality and confirm that required service components initialize correctly.

Updates as published by Cornerstone (original).