OpenTracing.Sampling

Distributed traces are sampled, meaning they (and the spans that make them up) are selected to either be reported or not.

This module defines a few different ways to determine if a given trace should be sampled.

Documentation

newtype Sampler

A Sampler is an algorithm for determine if a trace should be reported.

Constructors

Sampler

Fields

• runSampler :: forall m. MonadIO m => TraceID -> Text -> m Bool

  Run a sampler, providing it a trace id and the operation of the span.

constSampler :: Bool -> Sampler

A Sampler that always returns the given value. Useful for debug environments.

probSampler

Arguments

:: Double

A probability percentage, between 0.0 and 1.0

-> Sampler

A Sampler that randomly chooses to report a given percentage of traces. The source of randomness is the ID of the trace.

rateLimitSampler

Arguments

:: Double

Traces per second

-> IO Sampler

A Sampler that will report the given number of traces per second.