Can you explain a time when you had to troubleshoot a complex system failure in a cloud environment? What steps did you take to resolve the issue?

In a recent project, I faced a situation where a production service was down due to a misconfigured security group. I systematically gathered logs and metrics to identify the root cause. Once I pinpointed the issue, I implemented a fix by correcting the security configurations and initiated a rollback of the latest changes. I communicated with the team and documented the process, improving our incident response plan to include checks for similar misconfigurations.