public async Task MetricsWithRealAgent()
{
var logger = new TestLogger();
var payloadSender = new MockPayloadSender();
var configReader = new TestAgentConfigurationReader(logger, metricsInterval: "1s");
using (var agent = new ApmAgent(new AgentComponents(payloadSender: payloadSender, logger: logger, configurationReader: configReader)))
{
await Task.Delay(2200); //make sure we wait enough to collect 1 set of metrics
agent.ConfigurationReader.MetricsIntervalInMillisecond.Should().Be(1000);
}
payloadSender.Metrics.Should().NotBeEmpty();
payloadSender.Metrics.First().Samples.Should().NotBeEmpty();
}
public void DistributionShouldBeUniform(double rate)
{
const int total = 1_000_000;
var startCheckingAfter = Convert.ToInt32(total * 0.1); // i.e., after 10%
const double allowedDiffInRate = 0.01;
var sampledCount = 0;
var noopLogger = new NoopLogger();
var currentExecutionSegmentsContainer = new NoopCurrentExecutionSegmentsContainer();
var noopPayloadSender = new NoopPayloadSender();
var configurationReader = new TestAgentConfigurationReader(noopLogger);
var sampler = new Sampler(rate);
total.Repeat(i =>
{
var transaction = new Transaction(noopLogger, "test transaction name", "test transaction type", sampler,
/* distributedTracingData: */ null, noopPayloadSender, configurationReader, currentExecutionSegmentsContainer);
if (transaction.IsSampled)
{
++sampledCount;
}
if (i + 1 >= startCheckingAfter)
{
var actualRate = (double)sampledCount / (i + 1);
var diffInRate = actualRate - rate;
Assert.True(Math.Abs(diffInRate) <= allowedDiffInRate,
"Abs(diffInRate) should be <= allowedDiffInRate. " +
$"diffInRate: {diffInRate}, allowedDiffInRate: {allowedDiffInRate}, " +
$"i: {i}, " +
$"actual rate: {actualRate}, expected rate: {rate}, " +
$"actual sampled count: {sampledCount}, expected sampled count: {Convert.ToInt32((i + 1) * rate)}"
);
}
});
}
