I have an SQS queue subscribed to an SNS topic. When I publish a message to the topic and subsequently receive it from the queue, the message body contains my published message wrapped in some metadata added by SNS, as per "Amazon SNS -> SQS message body". Unlike the poster of that question, I want the metadata, as it allows me to generate some latency metrics.
However, I could find nothing in Amazon's documentation or elsewhere on the Googleable web explaining precisely what the metadata means. In Sending Amazon SNS Messages to Amazon SQS Queues, the Amazon docs give an example of the metadata but do not explain it.
Does anyone know what time the Timestamp field in the metadata is representing? Please provide a citation if possible, because it is really important to me that my understanding is accurate.
