If these charts were available, it would enable to the user to visualize the Tier and IOPS of the cluster during specific time ranges, and compare to other metrics such as CPU, iowait, etc.

In my team's experience, we use Atlas auto-scaling to allow a cluster to scale up/down based on load, but when looking at Metrics it is not clear which Tier the cluster was in (e.g. "M30") when evaluating other metrics like CPU utilization. We are able to manually track Cluster Tier by viewing the Project Activity Feed, but if this data was integrated into Metrics it would be great for comparison.