重启Azure AppService时遇settings.json配置加载失败异常

问题现象 #

从上周起，重启Azure AppService时频繁出现启动失败，核心报错：

InvalidDataException: 无法从文件'C:\home\site\diagnostics\settings.json'加载配置。

内部嵌套FormatException，具体错误信息：

JsonReaderException: 输入不包含任何JSON令牌。
以及当isFinalBlock为true时，预期输入以有效JSON令牌开头，行号：0 | 字节位置：0。

文件验证 #

该配置文件位于应用程序目录外，手动查看时内容为合法JSON：

{ "AzureDriveEnabled" : true, "AzureDriveTraceLevel" : "Information" }

调用堆栈跟踪 #

Microsoft.Extensions.Configuration.FileConfigurationProvider.HandleException(ExceptionDispatchInfo info)
Microsoft.Extensions.Configuration.FileConfigurationProvider.Load(bool reload)
Microsoft.Extensions.Configuration.FileConfigurationProvider.Load()
Microsoft.Extensions.Configuration.ConfigurationRoot..ctor(IList<IConfigurationProvider> providers)
Microsoft.Extensions.Configuration.ConfigurationBuilder.Build()
Microsoft.Extensions.Logging.AzureAppServices.SiteConfigurationProvider.GetAzureLoggingConfiguration(IWebAppContext context)
Microsoft.Extensions.Logging.AzureAppServicesLoggerFactoryExtensions.AddAzureWebAppDiagnostics(ILoggingBuilder builder, IWebAppContext context, Action<AzureBlobLoggerOptions> configureBlobLoggerOptions)
Microsoft.Extensions.Logging.AzureAppServicesLoggerFactoryExtensions.AddAzureWebAppDiagnostics(ILoggingBuilder builder)
Microsoft.AspNetCore.Hosting.AppServicesWebHostBuilderExtensions+<>c.<UseAzureAppServices>b__0_0(ILoggingBuilder builder)
Microsoft.Extensions.DependencyInjection.LoggingServiceCollectionExtensions.AddLogging(IServiceCollection services, Action<ILoggingBuilder> configure)
Microsoft.AspNetCore.Hosting.WebHostBuilderExtensions+<>c__DisplayClass8_0.<ConfigureLogging>b__0(IServiceCollection collection)
Microsoft.AspNetCore.Hosting.HostingStartupWebHostBuilder+<>c__DisplayClass6_0.<ConfigureServices>b__0(WebHostBuilderContext context, IServiceCollection services)
System.Action<T1, T2>.Invoke(T1 arg1, T2 arg2)
Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<.ctor>b__6_2(HostBuilderContext context, IServiceCollection services)
Microsoft.AspNetCore.Hosting.BootstrapHostBuilder.RunDefaultCallbacks(ConfigurationManager configuration, HostBuilder innerBuilder)
Microsoft.AspNetCore.Builder.WebApplicationBuilder..ctor(WebApplicationOptions options, Action<IHostBuilder> configureDefaults)
Microsoft.AspNetCore.Builder.WebApplication.CreateBuilder(string[] args)
*******.Program.Main(string[] args) in Program.cs

环境与临时处理 #

• 运行环境：初始为.NET6，升级至.NET8后问题未解决
• 临时缓解：重启AppService 2-3次后启动恢复正常，重新部署应用无法解决问题

内容的提问来源于stack exchange，提问作者lijevosmetalo