We have identified the root cause of the email delivery delays observed during this incident.
New database queries introduced as part of enhancements to the Request Approval feature were not fully optimized for our high-scale production environment. As a result, these queries caused temporary database latency, which led to delayed email processing.
The issue was quickly identified and addressed by our engineering team. No messages were lost, and the delays occurred only for a few minutes within the incident window previously reported.
A definitive fix has now been implemented, including new database indexes and adjustments to ensure the affected queries use these indexes efficiently.
To prevent recurrence, all future database queries related to new features will undergo stress testing prior to production deployment.
The service has remained stable since the fix, and no further impact is expected.
Thank you for your patience and understanding.