Define how to enable Meter attributes.

* Add `OTEL_METRICS_LIBRARY_ATTRIBUTES` variable * Update Metric SDK to clarify when Meter attributes should be exported. Fixes #1906 Signed-off-by: Harold Dost <[email protected]>
open-telemetry · Oct 19, 2021 · 7877870 · 7877870
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diff --git a/specification/metrics/sdk.md b/specification/metrics/sdk.md
@@ -817,6 +817,11 @@ modeled to interact with other components in the SDK:
 The SDK MUST provide configuration according to the [SDK environment
 variables](../sdk-environment-variables.md) specification.
 
+The SDK MAY export `library` and `version` information. Details found in the
+[Metrics SDK Configuration](../sdk-environment-variables.md#metrics-sdk-configuration)
+The SDK MUST respect the configuration preferences of the application provide a
+method to configure whether these data are exported as Attributes.
+
 ## Numerical limits handling
 
 The SDK MUST handle numerical limits in a graceful way according to [Error

diff --git a/specification/sdk-environment-variables.md b/specification/sdk-environment-variables.md
@@ -185,13 +185,18 @@ Known values for OTEL_METRICS_EXPORTER are:
 | Name            | Description | Default | Notes |
 |-----------------|---------|-------------|---------|
 | `OTEL_METRICS_EXEMPLAR_FILTER` | Filter for which measurements can become Exemplars. | `"with_sampled_trace"` | |
+| `OTEL_METRICS_LIBRARY_ATTRIBUTES` | Filter for if `library` and `version` from [Meter](./metrics/api.md#get-a-meter) are exported. | `false` | |
 
 Known values for `OTEL_METRICS_EXEMPLAR_FILTER` are:
 
 - `"none"`: No measurements are eligble for exemplar sampling.
 - `"all"`: All measurements are eligible for exemplar sampling.
 - `"with_sampled_trace"`: Only allow measurements with a sampled parent span in context.
 
+Known values for `OTEL_METRICS_LIBRARY_ATTRIBUTES` are:
+- `true` : Add the Meter `name` and `version` as Attributes on the metrics exported.
+- `false` : Don't add Meter `name` and `version` as Attributes on the metrics exported.
+
 ## Language Specific Environment Variables
 
 To ensure consistent naming across projects, this specification recommends that language specific environment variables are formed using the following convention: