Let's have a look at the options:

• Advanced Tools: Advanced Tools (Kudu) provides a collection of developer-oriented tools and extensibility points for the App Service. This will be one of the  most frequently used blades, once we deploy our app in Azure. I would highly encourage readers to read the Kudu wiki at https://github.com/projectkudu/kudu/wiki as it gives detailed information about Kudu.
• Performance test: In this blade, we can perform the load testing of our App Service by simulating the virtual load of any number of users and the duration that we want to test against by specifying the number of users and test duration. We can specify either an API endpoint URL or a Visual Studio Web Test to run for performance testing.
• Extensions:  Extensions add functionality to the App Service, such as the image optimizer for an image upload application, and so on.