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Deployment slots are a great thing that offers seamless delivery to production without downtime or missing messages. The main restrictions are a single slot and missing “Traffic Redirect” feature. There are more than four slots available for non-serverless App Service plans. A Quick Guide to Using Deployment Slots with Azure Functions is published by Stas Lebedenko, a senior software dev @ Sigma, Odessa.NET/Azure.NET user group. For Consumption plan upper limit is 200 VM`s, and for Premium it’s 20.