Disable Application Insights sampling with the ASP.NET Core libraries

Question

I need to retain all telemetry since we use this for analytics.

According to this article I can run the following Analytics query to determine the rate of sampling:

requests 
 | where timestamp > ago(1d)
 | summarize 100/avg(itemCount) by bin(timestamp, 1h) 
 | render areachart 

The results indicate some heavily sampling, especially during the day where only around 1 in 10 items are retained:

What confuses me is that the Azure Portal insdicates that sampling is set to 100%:

Perhaps this only reflects Ingestion sampling? Adaptive sampling could still be occurring on the server.

How do I disable sampling completely using the ASP.NET Core libraries for Application Insights? (i.e. Microsoft.ApplicationInsights.AspNetCore 1.0.2)

Currently, this is these are the only configuration I can find and there isn't anything on sampling:

var appInsightsConfiguration = new ConfigurationBuilder()
    .AddApplicationInsightsSettings(
        developerMode: false,
        instrumentationKey: Configuration["ApplicationInsights:InstrumentationKey"])
    .Build();

services.AddApplicationInsightsTelemetry(appInsightsConfiguration);

Answer 1

You can disable sampling by using the ApplicationInsightsServiceOptions class.

A usage example:

var aiOptions = new Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions();
aiOptions.EnableAdaptiveSampling = false;

services.AddApplicationInsightsTelemetry(Configuration, aiOptions);

See more details about sampling in the Application Insights ASP.NET Core Github documentation page.

Hope this helps,

Asaf