为什么 Application Insights 阻止我的辅助角色启动？

Question

我有一个只有一个工作者角色的 Azure 云服务，每次都会部署、启动和运行而不会失败，但是我运行遇到了一些我想用应用程序诊断的间歇性问题见解。我遵循了 this article as well as here.

的指示

安装 nugget 包并添加一行代码后，我在调试和发布模式下在本地运行云服务，并且能够看到报告给 Application Insights 资源的 AI 信息.所以我打包并将新配置上传到我的云服务。

但是从云端开始，工作者角色实际上不会启动——它进入循环死亡螺旋，在 "Diagnose and Solve Problems" blade 中，我总是得到以下错误的变体关于 "System.Threading.AsyncLocal'1'" 并且无法加载 RoleEntryPoint。跟随 this article 并没有对事情有太多的了解，因为这个错误几乎告诉了我为什么它一直在回收，但没有任何关于如何处理它的线索。

Production - WebReportDownloader_IN_0: BusyRole Waiting for role to start... Failed to load role entrypoint. System.TypeLoadException: Could not load type 'System.Threading.AsyncLocal`1' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. at Microsoft.ApplicationInsights.Extensibility.SdkInternalOperationsMonitor.Exit() at Microsoft.ApplicationInsights.Extensibility.Implementation.TelemetryConfigurationFactory.Initialize(TelemetryConfiguration configuration, TelemetryModules modules, String serializedConfiguration) at Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration.get_Active() at WebReportDownloader..ctor() in C:\Users\User\Source\Repos\Program\WebReportDownloader\WebReportDownloader.cs:line 21 --- End of inner exception stack trace --- at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.Activator.CreateInstance(Type type) at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetRoleEntryPoint(Assembly entryPointAssembly) at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.CreateRoleEntryPoint(RoleType roleTypeEnum) at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.InitializeRoleInternal(RoleType roleTypeEnum) [2017-09-14T15:28:21Z] Last exit time: [2017/09/14, 15:28:21.944]. Last exit code: 0.

通常我可以通过搜索异常 and/or 详细信息获得足够的提示，但这次我找不到任何与我的问题相似的内容。我只能猜测我的配置有一些小但关键的错误，但我无法根据我上面链接的说明确定我在哪里离开 rails。

我的 ServiceConfiguration.Cloud 文件...

    <?xml version="1.0" encoding="utf-8"?>
<ServiceConfiguration serviceName="WebReportDownloader" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration" osFamily="4" osVersion="*" schemaVersion="2015-04.2.6">
  <Role name="WebReportDownloader">
    <Instances count="2" />
    <ConfigurationSettings>
      <Setting name="Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString" value="UseDevelopmentStorage=true" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteAccess.Enabled" value="true" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteAccess.AccountUsername" value="admin" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteAccess.AccountEncryptedPassword" value="ENCRYPTEDVALUE" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteAccess.AccountExpiration" value="2018-09-01T23:59:59.0000000-04:00" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteForwarder.Enabled" value="true" />
      <Setting name="APPINSIGHTS_INSTRUMENTATIONKEY" value="KEYVALUE" />
    </ConfigurationSettings>
    <Certificates>
      <Certificate name="Microsoft.WindowsAzure.Plugins.RemoteAccess.PasswordEncryption" thumbprint="847EEDE0084CF57A5A774CAE9E700713726CC856" thumbprintAlgorithm="sha1" />
    </Certificates>
  </Role>
</ServiceConfiguration>

还有我的ApplicationInsights.config...

<?xml version="1.0" encoding="utf-8"?>
<ApplicationInsights xmlns="http://schemas.microsoft.com/ApplicationInsights/2013/Settings">
    <TelemetryInitializers>
        <Add Type="Microsoft.ApplicationInsights.DependencyCollector.HttpDependenciesParsingTelemetryInitializer, Microsoft.AI.DependencyCollector"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.AzureRoleEnvironmentTelemetryInitializer, Microsoft.AI.WindowsServer"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.AzureWebAppRoleEnvironmentTelemetryInitializer, Microsoft.AI.WindowsServer"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.BuildInfoConfigComponentVersionTelemetryInitializer, Microsoft.AI.WindowsServer"/>
    </TelemetryInitializers>
    <TelemetryModules>
        <Add Type="Microsoft.ApplicationInsights.DependencyCollector.DependencyTrackingTelemetryModule, Microsoft.AI.DependencyCollector">
            <ExcludeComponentCorrelationHttpHeadersOnDomains>
                <!-- 
        Requests to the following hostnames will not be modified by adding correlation headers. 
        This is only applicable if Profiler is installed via either StatusMonitor or Azure Extension.
        Add entries here to exclude additional hostnames.
        NOTE: this configuration will be lost upon NuGet upgrade.
        -->
                <Add>core.windows.net</Add>
                <Add>core.chinacloudapi.cn</Add>
                <Add>core.cloudapi.de</Add>
                <Add>core.usgovcloudapi.net</Add>
                <Add>localhost</Add>
                <Add>127.0.0.1</Add>
            </ExcludeComponentCorrelationHttpHeadersOnDomains>
        </Add>
        <Add Type="Microsoft.ApplicationInsights.Extensibility.PerfCounterCollector.PerformanceCollectorModule, Microsoft.AI.PerfCounterCollector">
            <!--
      Use the following syntax here to collect additional performance counters:

      <Counters>
        <Add PerformanceCounter="\Process(??APP_WIN32_PROC??)\Handle Count" ReportAs="Process handle count" />
        ...
      </Counters>

      PerformanceCounter must be either \CategoryName(InstanceName)\CounterName or \CategoryName\CounterName

      NOTE: performance counters configuration will be lost upon NuGet upgrade.

      The following placeholders are supported as InstanceName:
        ??APP_WIN32_PROC?? - instance name of the application process  for Win32 counters.
        ??APP_W3SVC_PROC?? - instance name of the application IIS worker process for IIS/ASP.NET counters.
        ??APP_CLR_PROC?? - instance name of the application CLR process for .NET counters.
      -->
        </Add>
        <Add Type="Microsoft.ApplicationInsights.Extensibility.PerfCounterCollector.QuickPulse.QuickPulseTelemetryModule, Microsoft.AI.PerfCounterCollector"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.DeveloperModeWithDebuggerAttachedTelemetryModule, Microsoft.AI.WindowsServer"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.UnhandledExceptionTelemetryModule, Microsoft.AI.WindowsServer"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.UnobservedExceptionTelemetryModule, Microsoft.AI.WindowsServer">
            <!--</Add>
    <Add Type="Microsoft.ApplicationInsights.WindowsServer.FirstChanceExceptionStatisticsTelemetryModule, Microsoft.AI.WindowsServer">-->
        </Add>
    </TelemetryModules>
    <TelemetryProcessors>
        <Add Type="Microsoft.ApplicationInsights.Extensibility.PerfCounterCollector.QuickPulse.QuickPulseTelemetryProcessor, Microsoft.AI.PerfCounterCollector"/>
        <Add Type="Microsoft.ApplicationInsights.Extensibility.AutocollectedMetricsExtractor, Microsoft.ApplicationInsights"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel.AdaptiveSamplingTelemetryProcessor, Microsoft.AI.ServerTelemetryChannel">
            <MaxTelemetryItemsPerSecond>5</MaxTelemetryItemsPerSecond>
            <ExcludedTypes>Event</ExcludedTypes>
        </Add>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel.AdaptiveSamplingTelemetryProcessor, Microsoft.AI.ServerTelemetryChannel">
            <MaxTelemetryItemsPerSecond>5</MaxTelemetryItemsPerSecond>
            <IncludedTypes>Event</IncludedTypes>
        </Add>
    </TelemetryProcessors>
    <TelemetryChannel Type="Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel.ServerTelemetryChannel, Microsoft.AI.ServerTelemetryChannel"/>
<!-- 
    Learn more about Application Insights configuration with ApplicationInsights.config here: 
    http://go.microsoft.com/fwlink/?LinkID=513840

    Note: If not present, please add <InstrumentationKey>Your Key</InstrumentationKey> to the top of this file.
  --></ApplicationInsights>

还有我的 "OnStart()" 方法，我在其中实际设置了 InstrumentationKey...

public override bool OnStart()
        {
            // Set the maximum number of concurrent connections
            ServicePointManager.DefaultConnectionLimit = 12;
            TelemetryConfiguration.Active.InstrumentationKey = RoleEnvironment.GetConfigurationSettingValue("APPINSIGHTS_INSTRUMENTATIONKEY");

            // For information on handling configuration changes
            // see the MSDN topic at https://go.microsoft.com/fwlink/?LinkId=166357.

            bool result = base.OnStart();

            Trace.TraceInformation("WebReportDownloader has been started");

            return result;
        }

我将不胜感激任何人可以提供的任何见解（哈哈！）或指导...

更新：

通过进一步的实验，我确定每当我尝试直接调用 Application Insights 程序集时（例如在创建遥测客户端或直接设置 ApplicationInsights 资源键时）或调用 ApplicationInsight TraceListener 时，因为跟踪下面的异常被称为

Could not load type 'System.Threading.AsyncLocal`1' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

如果我执行 run-time 检测，我能够获得一些基本的跟踪和日志到我的 Insight 资源，但我仍然无法尝试获得更多信息。

此外，我目前的目标是 .NET 4.6.1（我之前忽略提及的信息）。

Answer 1

根据您的描述，我创建了我的 Azure 云服务项目并在 .NET Framework 4.5 上添加了单个辅助角色目标，然后安装了 Microsoft.ApplicationInsights.WindowsServer 2.4.1 并添加了您提到的用于设置检测密钥的代码如下：

WorkerRole.cs

public class WorkerRole : RoleEntryPoint
{
    private readonly CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
    private readonly ManualResetEvent runCompleteEvent = new ManualResetEvent(false);

    public override void Run()
    {
        Trace.TraceInformation("WorkerRoleB is running");

        try
        {
            this.RunAsync(this.cancellationTokenSource.Token).Wait();
        }
        finally
        {
            this.runCompleteEvent.Set();
        }
    }

    public override bool OnStart()
    {
        // Set the maximum number of concurrent connections
        ServicePointManager.DefaultConnectionLimit = 12;

        TelemetryConfiguration.Active.InstrumentationKey = RoleEnvironment.GetConfigurationSettingValue("APPINSIGHTS_INSTRUMENTATIONKEY");

        // For information on handling configuration changes
        // see the MSDN topic at https://go.microsoft.com/fwlink/?LinkId=166357.

        bool result = base.OnStart();

        Trace.TraceInformation("WorkerRoleB has been started");

        return result;
    }

    public override void OnStop()
    {
        Trace.TraceInformation("WorkerRoleB is stopping");

        this.cancellationTokenSource.Cancel();
        this.runCompleteEvent.WaitOne();

        base.OnStop();

        Trace.TraceInformation("WorkerRoleB has stopped");
    }

    private async Task RunAsync(CancellationToken cancellationToken)
    {
        // TODO: Replace the following with your own logic.
        while (!cancellationToken.IsCancellationRequested)
        {
            Trace.TraceInformation("Working");
            await Task.Delay(1000);
        }
    }
}

部署到 Azure 云服务后，它可以正常工作，我可以从 AI 中检索诊断数据如下：

注意：因为Install the SDK in each project声明你需要设置ApplicationInsights.config文件总是复制到输出目录。

此外，您可以参考 quick start 并在运行时间检测您的应用程序以缩小此问题的范围。此外，如果我遗漏了什么或者您做了一些其他特殊代码，您可以更新您的问题以便我们解决此问题。

Answer 2

在与 Azure 支持的反复沟通之后，我终于能够设置屏幕共享会话。这位乐于助人的先生几乎立刻就把注意力集中在了这个问题上：因为我的工作者角色项目以 .NET 4.6.1 为目标，所以 ServiceConfiguration 文件（.Cloud.cscfg 和 .Local.cscfg ) 需要定位 osFamily 5。

VS17 向导生成的默认值将其设置为 osFamily=4，如下所示...

但是，为了使所有内容运行正确，我需要的是定位 osFamily=5，如下所示...

这一小的变化允许 Web 角色在实例化 TelemetryClient 时正确部署。

为什么 Application Insights 阻止我的辅助角色启动？

Why is Application Insights Preventing my Worker Role from Starting?

c#

azure

azure-worker-roles

azure-cloud-services

azure-application-insights