private SamplingPriority GetSamplingPriority(Span span, float rate, bool withRateLimiter)
{
var sample = ((span.TraceId * KnuthFactor) % TracerConstants.MaxTraceId) <= (rate * TracerConstants.MaxTraceId);
var priority = SamplingPriority.AutoReject;
if (sample)
{
if (withRateLimiter)
{
// Ensure all allowed traces adhere to the global rate limit
if (_limiter.Allowed(span.TraceId))
{
priority = SamplingPriority.AutoKeep;
}
// Always set the sample rate metric whether it was allowed or not
// DEV: Setting this allows us to properly compute metrics and debug the
// various sample rates that are getting applied to this span
span.SetMetric(Metrics.SamplingLimitDecision, _limiter.GetEffectiveRate());
}
else
{
priority = SamplingPriority.AutoKeep;
}
}
return(priority);
}
private SamplingPriority GetSamplingPriority(Span span, float rate, bool agentSampling)
{
var sample = (((ulong)span.TraceId.Lower * KnuthFactor) % TracerConstants.MaxTraceId) <= (rate * TracerConstants.MaxTraceId);
var priority = SamplingPriority.AutoReject;
if (sample && (agentSampling || _limiter.Allowed(span)))
{
priority = SamplingPriority.AutoKeep;
}
return(priority);
}
private int GetSamplingPriority(Span span, float rate, bool agentSampling)
{
// make a sampling decision as a function of traceId and sampling rate
var sample = (((ulong)span.TraceId.Lower * KnuthFactor) % TracerConstants.MaxTraceId) <= (rate * TracerConstants.MaxTraceId);
// legacy sampling based on data from agent
if (agentSampling)
{
return(sample ? SamplingPriorityValues.AutoKeep : SamplingPriorityValues.AutoReject);
}
// rules-based sampling + rate limiter
// NOTE: all tracers are changing this from AutoKeep/AutoReject to UserKeep/UserReject
// to prevent the agent from overriding user configuration
return(sample && _limiter.Allowed(span) ? SamplingPriorityValues.UserKeep : SamplingPriorityValues.UserReject);
}
private SamplingPriority GetSamplingPriority(Span span, float rate)
{
var sample = ((span.TraceId * KnuthFactor) % TracerConstants.MaxTraceId) <= (rate * TracerConstants.MaxTraceId);
var priority = SamplingPriority.AutoReject;
if (sample)
{
if (_tracingWithoutLimitsEnabled)
{
if (_limiter.Allowed(span))
{
priority = SamplingPriority.AutoKeep;
}
}
else
{
priority = SamplingPriority.AutoKeep;
}
}
return(priority);
}