public void ProactivelySampledOutItemThatIsLaterSampledInIsAddedToTheNextSampledInItem()
{
var sentTelemetry = new List <ITelemetry>();
TelemetryProcessorChain telemetryProcessorChainWithSampling = CreateTelemetryProcessorChainWithSampling(
sentTelemetry,
25);
// Get the random number of sampled out items
var sampledOutItemsCount = this.random.Next(100) + 100;
for (int i = 0; i < sampledOutItemsCount; i++)
{
var sampledOutTelemetry = new RequestTelemetry();
// This makes those items proactively sampled out
sampledOutTelemetry.ProactiveSamplingDecision = SamplingDecision.SampledOut;
// This operation ID hash is lower than 25, so every item in this batch is sampled in
sampledOutTelemetry.Context.Operation.Id = "abcdfeghijk";
telemetryProcessorChainWithSampling.Process(sampledOutTelemetry);
}
// No telemetry is recorded
Assert.AreEqual(0, sentTelemetry.Count);
// Sampling Rate has changed up
((SamplingTelemetryProcessor)telemetryProcessorChainWithSampling.FirstTelemetryProcessor).SamplingPercentage = 50;
for (int i = 0; i < 100; i++)
{
var sampledInTelemetry = new RequestTelemetry();
telemetryProcessorChainWithSampling.Process(sampledInTelemetry);
}
telemetryProcessorChainWithSampling.Dispose();
// The item that is sampled in will need to represent all sampled out items and itself:
// 4 * sampledOutItemsCount + 2, where 4 is (100 / 25) and 2 is (100 / 50) as per chosen sample rates
double expectedSamplingRate = (double)100 / (100 / 25 * sampledOutItemsCount + (100 / 50));
Assert.AreEqual(expectedSamplingRate, ((ISupportSampling)sentTelemetry.First()).SamplingPercentage.Value, delta: 0.01);
// Sampled out items are supposed to be cleared, no more gain up:
sentTelemetry.RemoveAt(0);
sentTelemetry.ForEach((item) => Assert.AreEqual(50, ((ISupportSampling)item).SamplingPercentage));
}
public void ProactivelySampledOutItemIsNotSent()
{
var sentTelemetry = new List <ITelemetry>();
TelemetryProcessorChain telemetryProcessorChainWithSampling = CreateTelemetryProcessorChainWithSampling(
sentTelemetry,
100);
var sampledOutTelemetry = new RequestTelemetry();
sampledOutTelemetry.ProactiveSamplingDecision = SamplingDecision.SampledOut;
telemetryProcessorChainWithSampling.Process(sampledOutTelemetry);
telemetryProcessorChainWithSampling.Dispose();
Assert.AreEqual(0, sentTelemetry.Count);
}
public void ProactivelySampledOutItemIsNotSentEvenIfItIsSampledIn()
{
var sentTelemetry = new List <ITelemetry>();
TelemetryProcessorChain telemetryProcessorChainWithSampling = CreateTelemetryProcessorChainWithSampling(
sentTelemetry,
50);
for (int i = 0; i < 100; i++)
{
var sampledOutTelemetry = new RequestTelemetry();
sampledOutTelemetry.IsSampledOutAtHead = true;
telemetryProcessorChainWithSampling.Process(sampledOutTelemetry);
}
telemetryProcessorChainWithSampling.Dispose();
Assert.AreEqual(0, sentTelemetry.Count);
}
public void ProactivelySampledInItemsAreNotGivenPriorityIfRatesAreNotSet()
{
var sentTelemetry = new List <ITelemetry>();
TelemetryProcessorChain telemetryProcessorChainWithSampling = CreateTelemetryProcessorChainWithSampling(
sentTelemetry,
50);
for (int i = 0; i < 1000; i++)
{
var item = new RequestTelemetry();
item.Context.Operation.Id = ActivityTraceId.CreateRandom().ToHexString();
// proactively sample in items with big score, so they should not be sampled in
if (SamplingScoreGenerator.GetSamplingScore(item.Context.Operation.Id) > 50)
{
item.ProactiveSamplingDecision = SamplingDecision.SampledIn;
}
telemetryProcessorChainWithSampling.Process(item);
}
Assert.AreEqual(0, sentTelemetry.Count(i => ((ISupportAdvancedSampling)i).ProactiveSamplingDecision == SamplingDecision.SampledIn));
}
