Which solution will meet these requirements?
Adjust the Auto Scaling group to scale faster when a high number of messages is in the queue.
Use the Amazon Simple Notification Service (Amazon SNS) fanout feature with Amazon SQS to send the notifications in parallel to all the C2 instances
Add an Amazon DynamoDB stream to accelerate the message processing
Create a queue for alarm notifications and a queue for information notifications. Update the application to collect messages from the alarm notifications queue first.
Explanations:
Scaling the Auto Scaling group based on the number of messages in the queue does not prioritize alarm notifications over information notifications. This would only adjust the processing capacity but not the message prioritization itself.
Using Amazon SNS with fanout to send messages in parallel to EC2 instances does not address the prioritization of alarm notifications over information notifications. It focuses on parallel delivery but not priority handling.
Adding an Amazon DynamoDB stream does not directly relate to message prioritization in the SQS queue. DynamoDB streams are used for capturing changes in DynamoDB tables, not for controlling message prioritization in SQS.
Creating separate SQS queues for alarm and information notifications allows for prioritizing alarm notifications. The application can first collect and process messages from the alarm notifications queue, ensuring that alarm messages are handled before information messages.
I assess that the answer is:
Create a queue for alarm notifications and a queue for information notifications. Update the application to collect messages from the alarm notifications queue first.