Define default value for traceid ratio. (#1322)

open-telemetry · Jan 11, 2021 · 54e3672 · 54e3672
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -31,6 +31,9 @@ Updates:
   ([#1269](/~https://github.com/open-telemetry/opentelemetry-specification/pull/1269))
 - Add requirement that the SDK allow custom generation of Trace IDs and Span IDs
   ([#1006](/~https://github.com/open-telemetry/opentelemetry-specification/pull/1006))
+- Add default ratio when TraceIdRatioSampler is specified by environment variable but
+  no ratio is.
+  ([#1322](/~https://github.com/open-telemetry/opentelemetry-specification/pull/1322))
 
 ## v0.7.0 (11-18-2020)
 

diff --git a/specification/sdk-environment-variables.md b/specification/sdk-environment-variables.md
@@ -27,7 +27,7 @@ Known values for `OTEL_TRACE_SAMPLER` are:
 
 Depending on the value of `OTEL_TRACE_SAMPLER`, `OTEL_TRACE_SAMPLER_ARG` may be set as follows:
 
-- For `traceidratio` and `parentbased_traceidratio` samplers: Sampling probability, a number in the [0..1] range, e.g. "0.25".
+- For `traceidratio` and `parentbased_traceidratio` samplers: Sampling probability, a number in the [0..1] range, e.g. "0.25". Default is 1.0 if unset.
 
 ## Batch Span Processor