how to prevent azure from scaling out additional instances until they are ready?

Question

We are having issues with an Azure Application Service. One of our webservices (MVC) caches data from the database at startup (Application_Start) - this takes approximately 3 m

Answer 1

You can do this in Azure with other resource type than classic VM like an App Service. App Services scale up and down with instances that share the same memory pool and thread pool.