Currently, the stats for the droplets are collected from the hypervisor layer. Because of that, we are not able to access fine-grained metrics such as memory usage. We're working on an updated version of our stats system which will provide an installable agent that gathers metrics to provide additional graphs.

You can follow the progress on this feature on our suggestions board: Add Ram & Disk Usage to Resource graphs. – Customer Feedback for DigitalOcean.

thank you very much for explaining.

+1