c# - 应用程序洞察 - TelemetryClient - DependencyTelemetry - UseSampling

Question

我正在尝试使用我的 AppInsightsHelper 类启用采样，该类启动依赖操作来跟踪性能。

这就是我初始化 TelematryClient 的方式:

 public ApplicationInsightsHelper(string key)
 {
        var config = TelemetryConfiguration.CreateDefault();
        config.InstrumentationKey = key;
        config.DefaultTelemetrySink.TelemetryProcessorChainBuilder.UseAdaptiveSampling(maxTelemetryItemsPerSecond: 1);

        _telemetryClient = new TelemetryClient(config);
 }

然后启动和停止操作:

   IOperationHolder<DependencyTelemetry> operation = null;
   operation = _telemetryClient.StartOperation<DependencyTelemetry>(friendlyName);
   operation.Telemetry.Name = friendlyName;
   operation.Telemetry.Type = type;
   operation.Telemetry.Timestamp = DateTime.UtcNow;

   operation.Telemetry.Duration = DateTime.UtcNow - operation.Telemetry.Timestamp;
   _telemetryClient.StopOperation(operation);

问题是上面的代码似乎忽略了采样设置并且所有操作都被跟踪。我还在 UseAdaptiveSampling 中添加了: exceptedTypes: "Dependency"以查看是否发生任何情况，并且正如预期的那样，依赖项不会被忽略。

Answer 1

如果是azure函数，可以通过host.json设置采样，参见here和 here了解详情。示例如下:

{
  "logging": {
    "applicationInsights": {
      "samplingSettings": {
        "isEnabled": true,
        "maxTelemetryItemsPerSecond" : 1
      }
    }
  }
}

如果您想使用 TelemetryClient 进行设置，您应该遵循此 article 。在 azure 函数的构造函数中，使用如下代码:

        /// Using dependency injection will guarantee that you use the same configuration for telemetry collected automatically and manually.
        public HttpTrigger2(TelemetryConfiguration telemetryConfiguration)
        {
            this.telemetryClient = new TelemetryClient(telemetryConfiguration);
        }

但截至目前，有一个 issue通过使用 telemetryConfiguration。