It looks like docs.microsoft.com has moved to learn.microsoft.com The most important link to update is: https://github.com/dotnet/roslyn/blob/de96b01ccc6c51d2ad0501df18475079fbe2c7e1/src/Analyzers/Core/Analyzers/Helpers/DiagnosticHelper.cs#L276 But consider updating *all links* (even code comments).