The correct answer is D. all of the mentioned.
CloudWatch is a monitoring service for AWS resources and applications. It provides a set of pre-defined metrics for Elastic Load Balancing, as well as the ability to create custom metrics.
Amazon Elastic Block Store (EBS) is a block storage service that provides persistent storage for Amazon Elastic Compute Cloud (EC2) instances. EBS provides a number of metrics that can be used to monitor the performance of EBS volumes, including the number of I/O operations per second, the average latency, and the throughput.
AWS Import/Export is a service that enables you to import and export large amounts of data to and from AWS. AWS Import/Export provides a number of metrics that can be used to monitor the performance of data imports and exports, including the number of files imported or exported, the total size of the data imported or exported, and the time it took to import or export the data.
In addition to the metrics provided by CloudWatch, EBS, and AWS Import/Export, you can also use the following metrics to monitor Elastic Load Balancing:
- Active connections: The number of connections that are currently active on the load balancer.
- Backend connections: The number of connections that have been made to the load balancer’s back ends.
- Request count: The number of requests that have been received by the load balancer.
- Response time: The average time it takes for the load balancer to respond to a request.
- Error rate: The percentage of requests that have resulted in an error.
These metrics can be used to monitor the performance of your Elastic Load Balancing load balancers and to identify any potential issues.