I’m trying to understand the sampling data. And I can’t seem to find the exact wording anywhere. Sometimes I just happen to not have all the logs from my application in the traces. I have treated to only log things as needed that’s fine. I don’t get any unexpected data in the log.

Here is my configuration:

            services.AddLogging();

            services.Configure<TelemetryConfiguration>(telemetryConfiguration =>
            {
                var telemetryProcessorChainBuilder = telemetryConfiguration.DefaultTelemetrySink.TelemetryProcessorChainBuilder;

                telemetryProcessorChainBuilder.UseAdaptiveSampling(maxTelemetryItemsPerSecond: 5, excludedTypes: "Request;Exception");

                telemetryProcessorChainBuilder.Build();
            });
            services.AddApplicationInsightsTelemetry(new ApplicationInsightsServiceOptions
            {
                EnableAdaptiveSampling = false,     
            });

In Azure, sampling is set to 100%.

And here is the log traces. Sometimes I get logged correctly twice and sometimes only once. Which is also odd, but it may make sense that it just logs “slower” sometimes.
enter image description here

And here still the log traces at a given second.
enter image description here

My first question. Sampling is the setting for the same messages? Or generally for all messages? I.e. if I get 5 messages with the same wording, I don’t drop more, or is it if I get 5 different messages in a second, I don’t drop more? Depending on my configuration.

The second more important question “do” my traces disappear because of the sampling setup? Or is it something else? How should sampling be set up if only logs I know about are coming out of the app? Off completely? Or set to a larger number of items?

Thanks

I’ve read Microsoft’s documentation, which clarified a lot of things for me, but unfortunately it’s not completely clear.
I’ve read articles and discussions, but haven’t found much.