如何将 Azure Application Insights for Asp.Net Core 5.0 配置为仅发送 4% 的请求和 100% 的异常？

Question

When I use the Data sampling settings on Azure portal — it really works: reduces the amount of data ingestion.

It logs only 4% of the successful requests and this is good.

However it logs only 4% of the all exceptions. And this is bad. Because I miss the lonely and rare exceptions.

How to configure Azure Application Insights for Asp.Net Core 5.0 to send only 4% of Requests and 100% of Exceptions?

Can it be done in Asp.Net Core Startup.ConfigureServices method?

Answer 1

I think you can refer to this chapter

It mentioned that in asp.net core, we can disable the default adaptive sampling and set fixed-rate sampling by builder.UseSampling(fixedSamplingPercentage); , and according to the sdk, we can also set include and exclude options

public static TelemetryProcessorChainBuilder UseSampling(this TelemetryProcessorChainBuilder builder, double samplingPercentage, string excludedTypes = null, string includedTypes = null);

my code here:

var configuration = app.ApplicationServices.GetService<TelemetryConfiguration>();
            var builder = configuration.DefaultTelemetrySink.TelemetryProcessorChainBuilder;
            // For older versions of the Application Insights SDK, use the following line instead:
            // var builder = configuration.TelemetryProcessorChainBuilder;
            // Using fixed rate sampling
            double fixedSamplingPercentage = 10;
            string excludedTypes = "Exception";
            string includedTypes = "Request";
            builder.UseSampling(fixedSamplingPercentage, excludedTypes, includedTypes);
            builder.Build();

Each request here will lead to an exception in my test, and here's the application insights detail: