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Add OTEL_TRACE_SAMPLER. #1136

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Oct 28, 2020
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Add OTEL_TRACE_SAMPLER. #1136

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7c8765d
Add OTEL_TRACE_SAMPLER.
carlosalberto Oct 23, 2020
5cab308
Update CHANGELOG.
carlosalberto Oct 23, 2020
3f39957
Update specification/sdk-environment-variables.md
carlosalberto Oct 23, 2020
4d09176
Remove extra space.
carlosalberto Oct 23, 2020
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Update specification/sdk-environment-variables.md
carlosalberto Oct 23, 2020
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -59,6 +59,8 @@ New:
([#1074](https://github.com/open-telemetry/opentelemetry-specification/pull/1074))
- Add semantic conventions for system metrics
([#937](https://github.com/open-telemetry/opentelemetry-specification/pull/937))
- Add OTEL_TRACE_SAMPLER env variable definition
([#1136](https://github.com/open-telemetry/opentelemetry-specification/pull/1136/))

Updates:

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1 change: 1 addition & 0 deletions spec-compliance-matrix.md
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Expand Up @@ -128,6 +128,7 @@ status of the feature is not known.
|OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT | | | | | | | | | | |
|OTEL_SPAN_EVENT_COUNT_LIMIT | | | | | | | | | | |
|OTEL_SPAN_LINK_COUNT_LIMIT | | | | | | | | | | |
|OTEL_TRACE_SAMPLER | | | | | | | | | | |

## Exporters

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3 changes: 3 additions & 0 deletions specification/sdk-environment-variables.md
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Expand Up @@ -9,10 +9,13 @@ The goal of this specification is to unify the environment variable names betwee
| OTEL_RESOURCE_ATTRIBUTES | Key-value pairs to be used as resource attributes | | See [Resource SDK](./resource/sdk.md#specifying-resource-information-via-an-environment-variable) for more details. |
| OTEL_LOG_LEVEL | Log level used by the SDK logger | "info" | |
| OTEL_PROPAGATORS | Propagators to be used as a comma separated list | "tracecontext,baggage" | Values MUST be deduplicated in order to register a `Propagator` only once. Unrecognized values MUST generate a warning and be gracefully ignored. |
| OTEL_TRACE_SAMPLER | Sampler to be used for traces | "always_on" | See [Sampling](./trace/sdk.md#sampling) |
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Known values for OTEL_PROPAGATORS are: "tracecontext", "baggage", "b3", "jaeger".
Additional values can be specified in the respective SDK's documentation, in case third party `Propagator`s are supported, such as "xray" or "ottracer".

Known values for OTEL_TRACE_SAMPLER are: "always_on", "always_off", "traceidratio", "parentbased_traceidratio".
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## Batch Span Processor

| Name | Description | Default | Notes |
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