We have been recently working on the topic of KPI tracking and implementation of the control charts in Looker:
If you would like to learn how to easily create yout KPI targets and KPI monitoring for the highly dimenisonal dataset, please check the blog here: https://medium.com/data-cookbook/looker-and-bigquery-ml-create-control-charts-for-your-kpis-3d9ad6ee...
Feel free to share your comments on our development.