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Update Probability Sampler description to remove "ratio-based" reference #4674

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carlosalberto merged 1 commit into from
Oct 3, 2025
Merged

Update Probability Sampler description to remove "ratio-based" reference #4674

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9 changes: 1 addition & 8 deletions specification/trace/sdk.md
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Expand Up @@ -512,14 +512,7 @@ OpenTelemetry follows W3C Trace Context Level 2, which specifies 56 bits of rand
The `ProbabilitySampler` sampler MUST ignore the parent `SampledFlag`.
For respecting the parent `SampledFlag`, see the `ParentBased` sampler specified below.

Note that the "ratio-based" part of this Sampler's name implies that
it makes a probability decision directly from the TraceID, even though
it was not originally specified in an exact way. In the present
specification, the Sampler decision is more nuanced: only a portion of
the identifier is used, after checking whether the OpenTelemetry
TraceState field contains an explicit randomness value.

Note that this is a non-composable form of probaiblity
Note that this is a non-composable form of probability
sampler. `ProbabilitySampler` directly implements the SDKs Sampler
API, whereas [`ComposableProbability`](#composableprobability) is the
composable form for use with [`CompositeSampler`](#compositesampler).
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