Azure App Service, deployment slots and

You can validate app changes in a staging deployment slot before swapping it with the production slot Preview Dismiss · Code of Conduct

If you use the new 'swap with preview' option, it will still restart the app domain, but it will pause before it actually applies the swap

deployment slot setting in azure Take advantage of deployment slots to validate changes and eliminate downtime when you

deployment slot swap with preview You can select the swap type as direct swap or a swap with preview where destination slot configuration is applied to the source deployment slot