Where can the administrator find this information?
Auto Scaling logs
AWS CloudTrail logs
EC2 instance logs
Elastic Load Balancer access logs
Explanations:
Auto Scaling logs do not provide detailed information about individual requests or their source IP addresses; they focus on scaling events and instance state changes.
AWS CloudTrail logs capture API calls made on AWS services, which does not include specific request details or IP addresses related to application traffic directed at an Application Load Balancer.
EC2 instance logs contain data relevant to the instances themselves, such as system logs and application logs, but they do not capture incoming request IP addresses from the Application Load Balancer.
Elastic Load Balancer access logs provide detailed information about requests sent to the load balancer, including the source IP addresses, request paths, and response statuses, making it the correct option for identifying request sources.
I systematize that the answer is:
Elastic Load Balancer access logs