@Dan Latvala Thanks for reaching out to Microsoft Q&A. Apologize for the inconvenience caused on this.
Is your .NET webapp running on Windows App Service plan or Linux App Service plan?
- If you web app is running on the Windows App Service plan I would suggest you install the Azure Web Apps Disk Usage extensions from site extensions through kudu and using that extension you understand which app is consuming more space and you can delete the unwanted space accordingly. Refer to this blog post to understand more what is taking my disk space for my azure web apps.
- If you webapp are running on the Linux App Service plan I would suggest restarting all the apps inside the app service plan to clear that temp file or try to scaleup the app service plan to next tier to increase the temp size.
You refer to this documentation for more information about the persistent files and temporary files in app service file system.
Feel free to reach back to me if you have any further questions on this.