I have tried Data Wrangler in Sagemaker last month and close the service. A few weeks later I have noticed the credit was charge $1 every hour and just realized that the Data Wranger auto-save the flow every minute. So, I deleted the unsaved flow and shut down all the services and instances according to advice on these two links :

• https://docs.aws.amazon.com/sagemaker/latest/dg/studio-lab-use-shutdown.html
• https://docs.aws.amazon.com/sagemaker/latest/dg/ex1-cleanup.html

Then, I left the Sagemaker untouched for the whole month of May, and just got back to the console yesterday. This is what I found out for May's bill:

Amazon SageMaker RunInstance $531.74

So, with another attempt, I installed an extension to automatically shut down idle kernels and set the limit to 10 min from advice here: https://aws.amazon.com/blogs/machine-learning/save-costs-by-automatically-shutting-down-idle-resources-within-amazon-sagemaker-studio/ Checked the cost in usage report, it turns out that the service was shut down after installing the extension but then it revoked itself after 5 hours later (during my sleep time). There's still cost from Studio although with less charge than previous one.

During this time, I'm sure that there're no running instances, running apps, kernel sessions or terminal sessions. I even deleted the user profile. Last thing I haven't tried is to set up scheduled shutdown coz I think the services should not cause difficulty to our life that much. Any advice for any effective action to completely shutdown the Sagemaker instance? Thanks.