Oracle Cloud Infrastructure 2021 Multicloud Architect Associate — Question 40

A subscriber of an Oracle Cloud Infrastructure (OCI) Notifications service topic complained about not receiving messages from the service.
Which option can help you debug this issue? (Choose the best answer.)

Answer options

• A. If OCI Notifications service does not receive an acknowledgement from a subscription endpoint, the service drops the message. Confirm that the subscriber is always online to receive messages to help debug the issue.
• B. If OCI Notifications service does not receive an acknowledgement from a subscription endpoint, check the NumberOfNotificationFailed metric through the OCI Monitoring service for failed messages. Copy these messages to an OCI Object Storage bucket. Make sure the subscriber has the required credentials to access this bucket to help debug the issue.
• C. If OCI Notifications service does not receive an acknowledgement from a subscription endpoint, the service tries to redeliver messages for up to one day. Make sure that the subscriber is online at least once a day to help debug the issue.
• D. If OCI Notifications service does not receive an acknowledgement from a subscription endpoint, the service tries to redeliver messages for up to two hours. Configure an alarm on the NumberOfNotificationFailed metric through the OCI Monitoring service to help debug the issue.

Correct answer: D

Explanation

The correct answer is D because the OCI Notifications service attempts to redeliver messages for only two hours before giving up, making it crucial to set an alarm for monitoring failures. Option A is incorrect as it doesn't address the time limitation for message redelivery. Option B suggests copying messages to Object Storage, which is unnecessary for debugging this specific issue. Option C is wrong because it inaccurately states that the service redelivers messages for one day, which is longer than the actual limit.