Is there a Databricks feature you wish existed or would like to see in future updates? 

Resource monitoring and usage alerts on DBU consumption at cluster level

We were asked to solve this problem so many times we made it into a product!  You can monitor your entire databricks account plus the cloud costs associated with those DBUs.  We break it down several different ways: all purpose vs job vs SQL warehouse.  We can even get it down to notebook and query-level costs.