public static TelemetryConfiguration ConfigureWithSampling(this TelemetryConfiguration configuration,
AdaptiveSamplingWorker worker)
{
// Automatically collect dependency calls
var dependencies = new DependencyTrackingTelemetryModule();
dependencies.Initialize(configuration);
// Automatically correlate all telemetry data with request
configuration.TelemetryInitializers.Add(new OperationCorrelationTelemetryInitializer());
// Build telemetry processing pipeline
configuration.TelemetryProcessorChainBuilder
// This telemetry processor will be executed
// first for all telemetry items to calculate the size and # of items
.Use((next) =>
{
return(new TelemetryRecordSizeProcessor(next, size => worker.OnCollectedItems(size)));
})
// This is a standard fixed sampling processor that'll let only 10%
.Use((next) =>
{
return(new SamplingTelemetryProcessor(next)
{
IncludedTypes = "Dependency",
SamplingPercentage = 10,
});
})
// This is a standard adaptive sampling telemetry processor
// that will sample in/out any telemetry item it receives
.Use((next) =>
{
var settings = new SamplingPercentageEstimatorSettings
{
MaxTelemetryItemsPerSecond = 1, // Default: 5 calls/sec
SamplingPercentageIncreaseTimeout = TimeSpan.FromSeconds(1), // Default: 2 min
SamplingPercentageDecreaseTimeout = TimeSpan.FromSeconds(1), // Default: 30 sec
EvaluationInterval = TimeSpan.FromSeconds(1), // Default: 15 sec
InitialSamplingPercentage = 25, // Default: 100%
};
var adaptiveSamplingProcessor = new AdaptiveSamplingTelemetryProcessor(settings, new AdaptiveSamplingPercentageEvaluatedCallback(AdaptiveSamplingEvaluated), next)
{
ExcludedTypes = "Event", // Exclude custom events from being sampled
};
return(adaptiveSamplingProcessor);
})
// This telemetry processor will be executed ONLY when telemetry is sampled in
.Use((next) =>
{
return(new TelemetryRecordSizeProcessor(next, size => worker.OnSentItems(size)));
})
.Build();
return(configuration);
}
public AggressivelySampleFastDependencies(ITelemetryProcessor next)
{
// Next TelemetryProcessor in the chain
_next = next;
this.samplingProcessor = new AdaptiveSamplingTelemetryProcessor(next)
{
ExcludedTypes = "Event", // exclude custom events from being sampled
MaxTelemetryItemsPerSecond = 1, // default: 5 calls/sec
SamplingPercentageIncreaseTimeout = TimeSpan.FromSeconds(1), // default: 2 min
SamplingPercentageDecreaseTimeout = TimeSpan.FromSeconds(1), // default: 30 sec
EvaluationInterval = TimeSpan.FromSeconds(1), // default: 15 sec
InitialSamplingPercentage = 25, // default: 100%
};
}
public void SettingsFromPassedInTelemetryProcessorsAreAppliedToSamplingTelemetryProcessor()
{
var nextMock = new Mock <ITelemetryProcessor>();
var next = nextMock.Object;
var adaptiveSamplingProcessor = new AdaptiveSamplingTelemetryProcessor(
new Channel.Implementation.SamplingPercentageEstimatorSettings
{
InitialSamplingPercentage = 25,
},
null,
next);
var percentageEstimatorProcessor = adaptiveSamplingProcessor.SamplingTelemetryProcessor;
Assert.AreEqual(25, percentageEstimatorProcessor.SamplingPercentage);
}
public void CurrentSamplingRateResetsOnInitialSamplingRateChange()
{
var nextMock = new Mock <ITelemetryProcessor>();
var next = nextMock.Object;
var adaptiveSamplingProcessor = new AdaptiveSamplingTelemetryProcessor(
new Channel.Implementation.SamplingPercentageEstimatorSettings
{
InitialSamplingPercentage = 20,
},
null,
next);
Assert.AreEqual(20, adaptiveSamplingProcessor.InitialSamplingPercentage);
Assert.AreEqual(100 / 20, adaptiveSamplingProcessor.SamplingPercentageEstimatorTelemetryProcessor.CurrentSamplingRate);
// change in InitialSamplingPercentage should change the CurrentSamplingPercentage:
adaptiveSamplingProcessor.InitialSamplingPercentage = 50;
Assert.AreEqual(50, adaptiveSamplingProcessor.InitialSamplingPercentage);
Assert.AreEqual(100 / 50, adaptiveSamplingProcessor.SamplingPercentageEstimatorTelemetryProcessor.CurrentSamplingRate);
}
public AggressivelySampleFastDependencies(ITelemetryProcessor next)
{
this.next = next;
this.samplingProcessor = new AdaptiveSamplingTelemetryProcessor(next);
}
/// <summary>
/// Creates a new instance of ConfigurableAdaptiveSamplingTelemetryProcessor
/// </summary>
/// <param name="next">Next telemetry processor in the chain</param>
public ConfigurableAdaptiveSamplingTelemetryProcessor(ITelemetryProcessor next)
{
this.next = next;
this.processor = new AdaptiveSamplingTelemetryProcessor(next);
}
