Consolidate OTLP variables to use TRACES / METRICS to describe talking…

CHANGELOG.md

@@ -14,6 +14,7 @@ New:
 
 Updates:
 
+- Rename signal-specific variables for `OTLP_EXPORTER_*` to `OTLP_EXPORTER_TRACE_*` and `OTLP_EXPORTER_METRICS_*`([#1362](https://github.com/open-telemetry/opentelemetry-specification/pull/1362))
 - Versioning and stability guarantees for OpenTelemetry clients([#1291](https://github.com/open-telemetry/opentelemetry-specification/pull/1291))
 - Additional Cassandra semantic attributes
   ([#1217](https://github.com/open-telemetry/opentelemetry-specification/pull/1217))

spec-compliance-matrix.md

@@ -123,7 +123,7 @@ status of the feature is not known.
 |OTEL_LOG_LEVEL                                |   | -  | + | [-](https://github.com/open-telemetry/opentelemetry-python/issues/1059)    | +  | -    | - |    | - | -  | -   |
 |OTEL_PROPAGATORS                              |   | +  |   | +    |    | -    | - |    | - | -  | -   |
 |OTEL_BSP_*                                    |   | +  |   | +    | +  | -    | - | +  | - | -  | -   |
-|OTEL_EXPORTER_OTLP_*                          |   | +  |   | +    | +  | -    | - |    | - | -  | -   |
+|OTEL_EXPORTER_OTLP_*                          |   | -  |   | -    | -  | -    | - |    | - | -  | -   |
 |OTEL_EXPORTER_JAEGER_*                        |   | +  |   | +    | +  | -    | - | +  | - | -  | -   |
 |OTEL_EXPORTER_ZIPKIN_*                        |   | +  |   | +    |    | -    | - |    | - | -  | -   |
 |OTEL_TRACE_EXPORTER                           |   | +  |   | -    |    |      |   |    |   | -  | -   |

specification/protocol/exporter.md

@@ -8,12 +8,12 @@ The following configuration options MUST be available to configure the OTLP expo
 
 | Configuration Option | Description                                                  | Default           | Env variable                                                 |
 | -------------------- | ------------------------------------------------------------ | ----------------- | ------------------------------------------------------------ |
-| Endpoint             | Target to which the exporter is going to send spans or metrics. The endpoint MUST be a valid URL with scheme (http or https) and host, and MAY contain a port and path. A scheme of https indicates a secure connection. When using `OTEL_EXPORTER_ENDPOINT` with OTLP/HTTP, exporters SHOULD follow the collector convention of appending the version and signal to the path (e.g. `v1/traces` or `v1/metrics`). The per-signal endpoint configuration options take precedence and can be used to override this behavior. See the [OTLP Specification][otlphttp-req] for more details. | `https://localhost:4317` | `OTEL_EXPORTER_OTLP_ENDPOINT` `OTEL_EXPORTER_OTLP_SPAN_ENDPOINT` `OTEL_EXPORTER_OTLP_METRIC_ENDPOINT` |
-| Protocol             | The protocol used to transmit the data. One of `grpc`,`http/json`,`http/protobuf`. | `grpc`               | `OTEL_EXPORTER_OTLP_PROTOCOL` `OTEL_EXPORTER_OTLP_SPAN_PROTOCOL` `OTEL_EXPORTER_OTLP_METRIC_PROTOCOL` |
-| Certificate File     | Path to certificate file for TLS credentials of gRPC client. Should only be used for a secure connection. | n/a               | `OTEL_EXPORTER_OTLP_CERTIFICATE` `OTEL_EXPORTER_OTLP_SPAN_CERTIFICATE` `OTEL_EXPORTER_OTLP_METRIC_CERTIFICATE` |
-| Headers              | Key-value pairs to be used as headers associated with gRPC or HTTP requests. See [Specifying headers](./exporter.md#specifying-headers-via-environment-variables) for more details.                   | n/a               | `OTEL_EXPORTER_OTLP_HEADERS` `OTEL_EXPORTER_OTLP_SPAN_HEADERS` `OTEL_EXPORTER_OTLP_METRIC_HEADERS` |
-| Compression          | Compression key for supported compression types. Supported compression: `gzip`| No value              | `OTEL_EXPORTER_OTLP_COMPRESSION` `OTEL_EXPORTER_OTLP_SPAN_COMPRESSION` `OTEL_EXPORTER_OTLP_METRIC_COMPRESSION` |
-| Timeout              | Max waiting time for the backend to process each spans or metrics batch. | 10s               | `OTEL_EXPORTER_OTLP_TIMEOUT` `OTEL_EXPORTER_OTLP_SPAN_TIMEOUT` `OTEL_EXPORTER_OTLP_METRIC_TIMEOUT` |
+| Endpoint             | Target to which the exporter is going to send spans or metrics. The endpoint MUST be a valid URL with scheme (http or https) and host, and MAY contain a port and path. A scheme of https indicates a secure connection. When using `OTEL_EXPORTER_ENDPOINT` with OTLP/HTTP, exporters SHOULD follow the collector convention of appending the version and signal to the path (e.g. `v1/traces` or `v1/metrics`). The per-signal endpoint configuration options take precedence and can be used to override this behavior. See the [OTLP Specification][otlphttp-req] for more details. | `https://localhost:4317` | `OTEL_EXPORTER_OTLP_ENDPOINT` `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT` `OTEL_EXPORTER_OTLP_METRICS_ENDPOINT` |
+| Protocol             | The protocol used to transmit the data. One of `grpc`,`http/json`,`http/protobuf`. | `grpc`               | `OTEL_EXPORTER_OTLP_PROTOCOL` `OTEL_EXPORTER_OTLP_TRACES_PROTOCOL` `OTEL_EXPORTER_OTLP_METRICS_PROTOCOL` |
+| Certificate File     | Path to certificate file for TLS credentials of gRPC client. Should only be used for a secure connection. | n/a               | `OTEL_EXPORTER_OTLP_CERTIFICATE` `OTEL_EXPORTER_OTLP_TRACES_CERTIFICATE` `OTEL_EXPORTER_OTLP_METRICS_CERTIFICATE` |
+| Headers              | Key-value pairs to be used as headers associated with gRPC or HTTP requests. See [Specifying headers](./exporter.md#specifying-headers-via-environment-variables) for more details.                   | n/a               | `OTEL_EXPORTER_OTLP_HEADERS` `OTEL_EXPORTER_OTLP_TRACES_HEADERS` `OTEL_EXPORTER_OTLP_METRICS_HEADERS` |
+| Compression          | Compression key for supported compression types. Supported compression: `gzip`| No value              | `OTEL_EXPORTER_OTLP_COMPRESSION` `OTEL_EXPORTER_OTLP_TRACES_COMPRESSION` `OTEL_EXPORTER_OTLP_METRICS_COMPRESSION` |
+| Timeout              | Max waiting time for the backend to process each spans or metrics batch. | 10s               | `OTEL_EXPORTER_OTLP_TIMEOUT` `OTEL_EXPORTER_OTLP_TRACES_TIMEOUT` `OTEL_EXPORTER_OTLP_METRICS_TIMEOUT` |
 
 Supported values for `OTEL_EXPORTER_OTLP_*COMPRESSION` options:
 
@@ -34,8 +34,8 @@ Example 2
 Traces and metrics are sent to different collectors using different protocols:
 
 ```bash
-export OTEL_EXPORTER_OTLP_SPAN_ENDPOINT=http://collector:4317
-export OTEL_EXPORTER_OTLP_SPAN_PROTOCOL=grpc
+export OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://collector:4317
+export OTEL_EXPORTER_OTLP_TRACES_PROTOCOL=grpc
 
 export OTEL_EXPORTER_OTLP_METRICS_ENDPOINT=https://collector.example.com/v1/metrics
 export OTEL_EXPORTER_OTLP_METRICS_PROTOCOL=http/protobuf
@@ -55,7 +55,7 @@ export OTEL_EXPORTER_OTLP_METRICS_PROTOCOL=http/json
 
 ### Specifying headers via environment variables
 
-The `OTEL_EXPORTER_OTLP_HEADERS`, `OTEL_EXPORTER_OTLP_SPAN_HEADERS`, `OTEL_EXPORTER_OTLP_METRIC_HEADERS` environment variables will contain a list of key value pairs, and these are expected to be represented in a format matching to the [W3C Correlation-Context](https://github.com/w3c/baggage/blob/master/baggage/HTTP_HEADER_FORMAT.md), except that additional semi-colon delimited metadata is not supported, i.e.: key1=value1,key2=value2. All attribute values MUST be considered strings.
+The `OTEL_EXPORTER_OTLP_HEADERS`, `OTEL_EXPORTER_OTLP_TRACES_HEADERS`, `OTEL_EXPORTER_OTLP_METRICS_HEADERS` environment variables will contain a list of key value pairs, and these are expected to be represented in a format matching to the [W3C Correlation-Context](https://github.com/w3c/baggage/blob/master/baggage/HTTP_HEADER_FORMAT.md), except that additional semi-colon delimited metadata is not supported, i.e.: key1=value1,key2=value2. All attribute values MUST be considered strings.
 
 ## Retry