When using PaaS services, you can configure how your application will behave when CPU utilization hits the maximum allowed value, or the number of requests exceeds the threshold. However, Azure offers services in other models—one of the most interesting is serverless architecture, which abstracts the control even more in favor of easier configuration, minimum maintenance, and ability to focus on delivering a business value.
In this section, you will see the differences between Azure App Services and Azure Functions when it comes to scaling, both from the technical and conceptual point of view.