Correct Answer - D.
When AWS X-Ray is integrated with AWS SQS, there is no impact of trace Header on AWS SQS message size or message attributes quota.
Option A is incorrect as 1 byte of trace header is not added to AWS SQS message size.
Option B is incorrect as Trace Header will be excluded from message attribute quota in AWS SQS message.
Option C is incorrect as Trace Header will be carried as Default HTTP Header or AWSTraceHeader System Attribute but not as a message content in an AWS SQS message.
For more information on AWS X-Ray with Amazon SQS, refer to the following URL-
https://docs.aws.amazon.com/xray/latest/devguide/xray-services-sqs.html
When AWS X-Ray is enabled for an application, it generates trace data for each request that passes through the application. This trace data contains information about the request, such as its origin, destination, and any other metadata that may be relevant.
To propagate this trace data across multiple services, X-Ray injects a trace header into each request as it passes through the application. This header contains a unique identifier for the request, as well as other information such as the sampling decision and parent ID.
In the context of an application that uses Amazon SQS and Amazon EC2 Container Service, the trace header is added to the messages that are sent through SQS. This allows X-Ray to trace the entire path of the request as it moves through the different components of the application.
Now, coming to the given options:
A. 1 byte of Trace header is added to AWS SQS message size.
This option is incorrect because the trace header is not a fixed size. The size of the header depends on the length of the trace ID, sampling decision, and parent ID, which can vary based on the configuration of the application.
B. Trace Header will be included as a message attribute in an AWS SQS message.
This option is correct. When X-Ray injects the trace header into an SQS message, it does so by adding the header as a message attribute. This attribute can then be used by the receiving service to continue the trace.
C. Trace Header will be included as message content in an AWS SQS message.
This option is incorrect because the trace header is not added as message content. Message content refers to the actual data being transmitted, whereas the trace header is metadata about the request.
D. Trace header is excluded from AWS SQS message size.
This option is also incorrect because the trace header is included in the message size. The size of the message will increase based on the size of the trace header that is added.
In conclusion, option B is the correct answer. When AWS X-Ray is enabled for an application that uses Amazon SQS, the trace header is added as a message attribute in each SQS message.
