AspNetCore.Docs/aspnetcore/includes/localization/unsupported-culture-log-level.md

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[!NOTE] Prior to ASP.NET Core 3.0 web apps write one log of type LogLevel.Warning per request if the requested culture is unsupported. Logging one LogLevel.Warning per request is can make large log files with redundant information. This behavior has been changed in ASP.NET 3.0. The RequestLocalizationMiddleware writes a log of type LogLevel.Debug, which reduces the size of production logs.