A generic question. If you have Azure webapp set to scale out. Say 2 - 4 instances. If I do a deployment from VS to a slot and then swap - how does this work with the multiple instances.

I believe your slot will show the same amount of instances as Production. You can see this if you look at the Health Check section on the web app. Microsoft has a section on what occurs during a swap here: https://learn.microsoft.com/en-us/azure/app-service/deploy-staging-slots?tabs=portal#what-happens-during-a-swap Based on that post it will perform a swap on each instance.

Magic - thanks that's the missing doc I couldn't find.