Hi Team,

How would rightsizing recommendation report on start and stop instance. For example if my instance t2.micro is running for 15 day switched for next 7 days and again resumes back after 7 days?

Rightsizing can be viewed from a 10-day and a 30-day view. In the scenario you listed above, you would likely not see that VM in a 30-day view because there would not be 30 days of history to analyze. It may show up in the 10-day view, depending on which day you look and also its CPU utilization. (There would need to be 10 days of history for it to show up at all.) The second thing to think about here is the reason for rightsizing. It's to reduce your compute costs.  In this case you are already doing that by shutting it down about 1/3 of the time if your 15 days on and 7 days off cycle is consistent. Rightsizing a VM that is running 2/3 of the time would certainly save some costs but it may not be significant compared to the savings you are already getting by shutting it down for 1/3 of the time.