ASP.NET Core supports diagnostic logging through the Microsoft.Extensions.Logging package. This logging solution (which is used throughout ASP.NET Core, including internally by the Kestrel host) is highly extensible. There’s already documentation available to help developers get started with ASP.NET Core logging, so I’d like to use this post to highlight how custom log providers (like Microsoft.Extensions.Logging.AzureAppServices and Serilog) make it easy to log to a wide variety of destinations.