Major incident

Cornerstone: Intermittent Service Disruption on UK SL production

Affected: Uptime, Uptime, Uptime

Current status of Cornerstone: Operational — live Cornerstone status

Timeline

1. Jun 29, 2026, 08:49 UTC
   identified
   UK swimlanes are experiencing an intermittent service disruption. This is our top priority and we are working to resolve the problem as soon as possible. Please check back periodically for additional updates, which will be posted as they become available.
2. Jun 29, 2026, 09:13 UTC
   identified
   Users report issue on Career Site as well. We keep on working on the problem.
3. Jun 29, 2026, 11:05 UTC
   identified
   We continue to work on the fix for this issue.
4. Jun 29, 2026, 11:26 UTC
   monitoring
   A fix has been implemented and we are monitoring the results.
5. Jun 29, 2026, 12:27 UTC
   resolved
   This incident has been resolved.
6. Jul 10, 2026, 06:22 UTC
   postmortem
   **Incident Summary:** On June 28th, 2026, at 11:24 AM PT, users in the UK Production environment experienced intermittent service degradation impacting session management functionality. The issue resulted in reduced service availability and intermittent failures while accessing affected applications. **Impact:** Users experienced intermittent service disruption and degraded application responsiveness due to instability within the session management service. Some requests were impacted during the incident window, resulting in temporary failures across affected portal functionalities. **Root Cause Analysis \(RCA\):** The issue was related to transient service instability following infrastructure changes, which impacted the availability and responsiveness of the session management service. During recovery, service initialization delays affected the ability to restore full processing capacity within the expected timeframe, resulting in intermittent service impact. **Resolution:** As an immediate mitigation, service traffic handling was adjusted to allow the affected components to stabilize and recover successfully. Once service capacity was restored and stability was confirmed, normal traffic processing resumed and application performance returned to expected levels. **Preventive Actions:** The following measures have been implemented to reduce the likelihood of recurrence: * Service startup and recovery behavior are being reviewed to improve restoration time during availability events. * Additional monitoring and validation checks are being enhanced to improve visibility into service health and recovery patterns.

Updates as published by Cornerstone (original).