Root Cause
A sudden surge in login requests led to a failure due to the limited number of available connections for authentication. This caused users to be unable to log in, although those already logged in were not affected.
Resolution
The issue was resolved by rolling out the application after detecting a database failover. This action restored the system's functionality and allowed users to log in again.
Action Plan
We plan to set up alerts for database connections. Monitoring of connection pools will be enhanced. The security team is keeping an eye on suspicious login IP addresses to block them if necessary.