Add OTEL_EXPORTER environment variable (#943)

* Add OTEL_EXPORTER environment variable * feedback * Add note about otlp=otlp_span,otlp_metric
open-telemetry · Sep 16, 2020 · 5035e82 · 5035e82
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diff --git a/spec-compliance-matrix.md b/spec-compliance-matrix.md
@@ -110,6 +110,7 @@ status of the feature is not known.
 |OTEL_EXPORTER_OTLP_*                          |   |    |   | -    |    | -    | - |    | - | -  |
 |OTEL_EXPORTER_JAEGER_*                        |   |    |   | -    |    | -    | - |    | - | -  |
 |OTEL_EXPORTER_ZIPKIN_*                        |   |    |   | +    |    | -    | - |    | - | -  |
+|OTEL_EXPORTER                                 |   |    |   |      |    |      |   |    |   |    |
 
 ## Exporters
 

diff --git a/specification/sdk-environment-variables.md b/specification/sdk-environment-variables.md
@@ -19,19 +19,9 @@ The goal of this specification is to unify the environment variable names betwee
 | OTEL_BSP_MAX_QUEUE_SIZE        | Maximum queue size                             | 2048    |                                                       |
 | OTEL_BSP_MAX_EXPORT_BATCH_SIZE | Maximum batch size                             | 512     | Must be less than or equal to OTEL_BSP_MAX_QUEUE_SIZE |
 
-## OTLP Span Exporter
+## OTLP Exporter
 
-| Name                             | Description                                | Default |
-| -------------------------------- | ------------------------------------------ | ------- |
-| OTEL_EXPORTER_OTLP_SPAN_TIMEOUT  | Max waiting time to export each span batch | -       |
-| OTEL_EXPORTER_OTLP_SPAN_ENDPOINT | Ingest endpoint for OTLP spans             | -       |
-
-## OTLP Metric Exporter
-
-| Name                               | Description                                  | Default |
-| ---------------------------------- | -------------------------------------------- | ------- |
-| OTEL_EXPORTER_OTLP_METRIC_TIMEOUT  | Max waiting time to export each metric batch | -       |
-| OTEL_EXPORTER_OTLP_METRIC_ENDPOINT | Ingest endpoint for OTLP metrics             | -       |
+See [OpenTelemetry Protocol Exporter Configuration Options](./protocol/exporter.md).
 
 ## Jaeger Exporter
 
@@ -49,6 +39,16 @@ The goal of this specification is to unify the environment variable names betwee
 | ----------------------------- | -------------------------- | ------------------------------------------------------------------------------------------------------------ |
 | OTEL_EXPORTER_ZIPKIN_ENDPOINT | Endpoint for Zipkin traces | <!-- markdown-link-check-disable --> "http://localhost:9411/api/v2/spans"<!-- markdown-link-check-enable --> |
 
+## Exporter Selection
+
+| Name          | Description                                                                  | Default |
+| ------------- | ---------------------------------------------------------------------------- | ------- |
+| OTEL_EXPORTER | Exporter to be used, can be a comma-separated list to use multiple exporters | "otlp"  |
+
+Known values for OTEL_EXPORTER are: "otlp", "jaeger", "zipkin", "prometheus", "otlp_span", "otlp_metric".
+
+Note: "otlp" is equivalent to "otlp_span,otlp_metric".
+
 ## Language Specific Environment Variables
 
 To ensure consistent naming across projects, this specification recommends that language specific environment variables are formed using the following convention: