尝试记录指标 Azure 函数时出错

Question

我的 Logger 出现问题，每当我尝试记录指标时，都会发生错误。下面，我留下了发生错误的代码部分。

private void LogBlobExecutionMetric(ILogger log,
                                        BlobMigrationStrategyIdentifier blobMigrationStrategyIdentifier,
                                        ControlMetadataEntity controlMetadataEntity,
                                        BlobMetadataEntity blobMetadataEntity,
                                        long elapsedMilliseconds,
                                        long? fileSizeInBytes)
    {
        // Create the properties for all metrics that will be logged.
        Dictionary<string, object> properties = new Dictionary<string, object>()
        {
            { "BlobMigrationStrategyIdentifier", blobMigrationStrategyIdentifier.ToString() },
            { "ExecutionId", controlMetadataEntity.RowKey },
            { "BlobMetadataId", blobMetadataEntity.RowKey },
            { "BlobState", blobMetadataEntity.State }
        };

        //The error occurs here 
        log.LogMetric("BlobExecutionElapsedMilliseconds", elapsedMilliseconds, properties);
    }

我尝试了几件事，但没有成功。唯一的解决方案是从 log.LogMetric() 切换到 log.LogInformation()，但是那样我会丢失所有指标，并且很难从我的应用程序中跟踪洞察力

我还留下了一个生成的堆栈跟踪，但即使警告 null 参数，我检查并没有传递的参数为 null 或不正确。

    Result: Failure
Exception: System.AggregateException: One or more errors occurred. (An error occurred while writing to logger(s). (Value cannot be null. (Parameter 'value')))
 ---> System.AggregateException: An error occurred while writing to logger(s). (Value cannot be null. (Parameter 'value'))
 ---> System.ArgumentNullException: Value cannot be null. (Parameter 'value')
   at Google.Protobuf.ProtoPreconditions.CheckNotNull[T](T value, String name)
   at Microsoft.Azure.Functions.Worker.Logging.GrpcFunctionsHostLogger.Log[TState](LogLevel logLevel, EventId eventId, TState state, Exception exception, Func`3 formatter) in D:\a\1\s\src\DotNetWorker.Grpc\GrpcFunctionsHostLogger.cs:line 44
   at Microsoft.Extensions.Logging.Logger.<Log>g__LoggerLog|12_0[TState](LogLevel logLevel, EventId eventId, ILogger logger, Exception exception, Func`3 formatter, List`1& exceptions, TState& state)
   --- End of inner exception stack trace ---
   at Microsoft.Extensions.Logging.Logger.ThrowLoggingError(List`1 exceptions)
   at Microsoft.Extensions.Logging.Logger.Log[TState](LogLevel logLevel, EventId eventId, TState state, Exception exception, Func`3 formatter)
   at Microsoft.Extensions.Logging.LoggerExtensions.LogMetric(ILogger logger, String name, Double value, IDictionary`2 properties) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Loggers\Logger\LoggerExtensions.cs:line 33
   at ThomsonReuters.DocMi.BlobMigration.Execution.AzureFunctions.Functions.BlobMigration.RunBlobMigration.LogBlobExecutionMetric(ILogger log, BlobMigrationStrategyIdentifier blobMigrationStrategyIdentifier, ControlMetadataEntity controlMetadataEntity, BlobMetadataEntity blobMetadataEntity, Int64 elapsedMilliseconds, Nullable`1 fileSizeInBytes) in /home/runner/work/DocMi_Functions/DocMi_Functions/src/BlobMigration/ExecutionServices/ThomsonReuters.DocMi.BlobMigration.Execution.AzureFunctions/Functions/BlobMigration/RunBlobMigration.cs:line 195
   at ThomsonReuters.DocMi.BlobMigration.Execution.AzureFunctions.Functions.BlobMigration.RunBlobMigration.RunAsync(String messageBrokerMessageString, FunctionContext context) in /home/runner/work/DocMi_Functions/DocMi_Functions/src/BlobMigration/ExecutionServices/ThomsonReuters.DocMi.BlobMigration.Execution.AzureFunctions/Functions/BlobMigration/RunBlobMigration.cs:line 164
   at Microsoft.Azure.Functions.Worker.Invocation.VoidTaskMethodInvoker`2.InvokeAsync(TReflected instance, Object[] arguments) in D:\a\1\s\src\DotNetWorker.Core\Invocation\VoidTaskMethodInvoker.cs:line 24
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionInvoker`2.<>c.<InvokeAsync>b__6_0(Task`1 t) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionInvoker.cs:line 32
   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   --- End of stack trace from previous location ---
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
   --- End of stack trace from previous location ---
   at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionExecutor.ExecuteAsync(FunctionContext context) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionExecutor.cs:line 45
   at Microsoft.Azure.Functions.Worker.OutputBindings.OutputBindingsMiddleware.Invoke(FunctionContext context, FunctionExecutionDelegate next) in D:\a\1\s\src\DotNetWorker.Core\OutputBindings\OutputBindingsMiddleware.cs:line 16
   at Microsoft.Azure.Functions.Worker.GrpcWorker.InvocationRequestHandlerAsync(InvocationRequest request, IFunctionsApplication application, IInvocationFeaturesFactory invocationFeaturesFactory, ObjectSerializer serializer, IOutputBindingsInfoProvider outputBindingsInfoProvider) in D:\a\1\s\src\DotNetWorker.Grpc\GrpcWorker.cs:line 167
Stack:   
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionInvoker`2.<>c.<InvokeAsync>b__6_0(Task`1 t) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionInvoker.cs:line 32
   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   --- End of stack trace from previous location ---
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
   --- End of stack trace from previous location ---
   at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionExecutor.ExecuteAsync(FunctionContext context) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionExecutor.cs:line 45
   at Microsoft.Azure.Functions.Worker.OutputBindings.OutputBindingsMiddleware.Invoke(FunctionContext context, FunctionExecutionDelegate next) in D:\a\1\s\src\DotNetWorker.Core\OutputBindings\OutputBindingsMiddleware.cs:line 16
   at Microsoft.Azure.Functions.Worker.GrpcWorker.InvocationRequestHandlerAsync(InvocationRequest request, IFunctionsApplication application, IInvocationFeaturesFactory invocationFeaturesFactory, ObjectSerializer serializer, IOutputBindingsInfoProvider outputBindingsInfoProvider) in D:\a\1\s\src\DotNetWorker.Grpc\GrpcWorker.cs:line 167

感谢所有可以为此错误提出解决方案或替代方案的人，非常感谢。

Answer 1

要处理这个错误，我们需要检查记录器是否使用任何其他记录器函数（如 ConsoleLogger）进行初始化

同时检查来自 saftimufti 的SO 答案。 如果日志指标是自定义的，请检查 custommetrics。

跟踪指标的示例代码：

TelemetryConfiguration.Active.InstrumentationKey = "your key";
TelemetryClient client = new TelemetryClient(); 
client.TrackMetric("my metric", 60);
client.GetMetric("my metric").TrackValue(89);
client.Flush();

Answer 2

我遇到了完全相同的问题。当 ILogger 被注入到函数中时，它在 v3 Azure 函数中运行良好。但是，在更新到 .NET 6 并在进程外运行该函数后，它不再起作用。文档说我们必须注入 FunctionContext context 并在函数中执行 context.GetLogger<MyType>(); 返回的记录器似乎应该完全初始化，但是我得到了与 OP 相同的异常。简单地将 ILogger 注入类构造函数会导致相同的异常。将 ILogger 直接注入函数 Run 方法确实不会导致异常，但随后该指标不会被记录，只是被忽略。

我通过重写使其工作，以便更直接地使用 ApplicationInsights 日志记录，主要与建议的第一个答案相同，但这里有一个更详细的示例：

首先确保 Program.cs 文件包含以下内容：

static async Task Main(string[] args)
{
    var host = new HostBuilder()
        .ConfigureServices(s =>
        {
            s.AddLogging();
            s.AddApplicationInsightsTelemetryWorkerService();
        }
}

假设您使用的是 DI，请确保按如下方式创建遥测客户端：

private readonly TelemetryClient _telemetryClient;

public MyClass(TelemetryConfiguration telemetryConfiguration)
{
    _telemetryClient = new TelemetryClient(telemetryConfiguration);
}

然后，在您的函数中，您可以像这样记录您的自定义指标：

var myMetric = new MetricTelemetry
{
    Name = "MyMetricName",
    Sum = 123
};
myMetric.Properties.Add("MyCustomProperty1", "My custom property value 1.");
myMetric.Properties.Add("MyCustomProperty2", "My custom property value 2.");

_telemetryClient.TrackMetric(myMetric);