[FEAT] SQS Standard queue supports passing "MessageGroupId" for Fair Queues feature #1496

Service
SQS

API Action / Feature
SendMessage — MessageGroupId parameter on standard (non-FIFO) queues

AWS Documentation
SendMessage — MessageGroupId parameter on standard (non-FIFO) queues
ReceiveMessage — MessageGroupId system attribute

Why is this needed?
Our application sends messages to standard (non-FIFO) SQS queues using the AWS SDK's SendMessageRequest with MessageGroupId set to a caller-supplied correlation value (an EnvironmentId GUID):

SendMessageRequest sqsSendMessageRequest = new()
{
    QueueUrl = myQueueUrl,
    MessageBody = JsonSerializer.Serialize(message),
    MessageGroupId = myQueueUrl.EndsWith(".fifo") ? "1" : message.EnvironmentId
};

On ReceiveMessage, we retrieve that value back via --attribute-names MessageGroupId.

aws sqs receive-message \
  --queue-url <url> \
  --attribute-names MessageGroupId \
  --max-number-of-messages 1

Floci silently discards MessageGroupId on SendMessage for standard queues (which is correct per AWS spec), so ReceiveMessage returns no MessageGroupId attribute.

Are you willing to contribute a PR?

• Yes
• No