CODEWITHSUNDEEP
c#asp.net-coredependency-injectionazure-application-insights
Mike Christensen
Mike Christensen

Reputation: 91666

How to configure Adaptive Sampling through IServiceCollection

According to the docs, under "Configure sampling settings", we can configure adaptive sampling and also include or exclude certain types from sampling:

public void Configure(IApplicationBuilder app, IHostingEnvironment env, TelemetryConfiguration configuration)
{
    var builder = configuration.DefaultTelemetrySink.TelemetryProcessorChainBuilder;
    // For older versions of the Application Insights SDK, use the following line instead:
    // var builder = configuration.TelemetryProcessorChainBuilder;

    // Using adaptive sampling
    builder.UseAdaptiveSampling(maxTelemetryItemsPerSecond:5);

    // Alternately, the following configures adaptive sampling with 5 items per second, and also excludes DependencyTelemetry from being subject to sampling.
    // builder.UseAdaptiveSampling(maxTelemetryItemsPerSecond:5, excludedTypes: "Dependency");

    // If you have other telemetry processors:
    builder.Use((next) => new AnotherProcessor(next));
    
    builder.Build();

    // ...
}

However, is there a way to do the same thing if we're configuring our application through WebHostBuilder.Configure() and passing in a delegate that takes an IApplicationBuilder? In this situation, we wouldn't be able to obtain the TelemetryConfiguration through DI.

I need to do something similar as the above, but I've only got the IApplicationBuilder interface. From the docs, it seems like I should use TelemetryConfiguration.Active.DefaultTelemetrySink.TelemetryProcessorChainBuilder, but TelemetryConfiguration.Active says it's obsolete on .NET Core and also says it loads the instance from ApplicationInsights.config, which I don't even have. I'm creating an entire AppInsights client from code.

I suppose another way to do it would be to create my own TelemetryProcessor that does sampling exactly the way I want, but this seems like overkill. Basically I'd like to alter the configuration of the current AdaptiveSamplingTelemetryProcessor in the pipeline.

Upvotes: 1

Views: 766

Answers (1)

Kirk Larkin
Kirk Larkin

Reputation: 93173

The IApplicationBuilder interface has an ApplicationServices property, which you can use to resolve TelemetryConfiguration. Here's an example of how to use it:

webHostBuilder.Configure(applicationBuilder =>
{
    var telemetryConfiguration = applicationBuilder.ApplicationServices
        .GetRequiredService<TelemetryConfiguration>();

    // ...
});

This TelemetryConfiguration instance, which is registered as a singleton, is the same instance you're given when using Startup.Configure.

Upvotes: 1

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