Thanks for the reply Mark - interesting to see that Apptio is moving to the Cost & Usage report. Will definitely check this out.
The context for my question is that our organisation is currently looking at optimising our Cloud spend but our Cloud service owner has stated that the AWS Trusted Advisor recommendations are not a reliable source on insights since they don't include memory usage as part of their analysis.
So I was hoping to see if other customers have the same concerns or if they have been able to act on the recommendations from AWS.