add OTEL_LOGS_EXPORTER env variable (#2320)

As per the change in the specification, adding the variable. There will be a follow up PR to use the variable.

Author: Alex Boten

CHANGELOG.md

@@ -14,6 +14,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#2253](https://github.com/open-telemetry/opentelemetry-python/pull/2253))
 - Rename ConsoleExporter to ConsoleLogExporter
   ([#2307](https://github.com/open-telemetry/opentelemetry-python/pull/2307))
+- Adding OTEL_LOGS_EXPORTER environment variable
+  ([#2320](https://github.com/open-telemetry/opentelemetry-python/pull/2320))
 
 ## [1.7.1-0.26b1](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.7.0-0.26b0) - 2021-11-11
 

opentelemetry-api/src/opentelemetry/environment_variables.py

@@ -12,6 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+OTEL_LOGS_EXPORTER = "OTEL_LOGS_EXPORTER"
+"""
+.. envvar:: OTEL_LOGS_EXPORTER
+
+"""
+
 OTEL_METRICS_EXPORTER = "OTEL_METRICS_EXPORTER"
 """
 .. envvar:: OTEL_METRICS_EXPORTER

opentelemetry-sdk/src/opentelemetry/sdk/_configuration/__init__.py

@@ -25,6 +25,7 @@
 
 from opentelemetry import trace
 from opentelemetry.environment_variables import (
+    OTEL_LOGS_EXPORTER,
     OTEL_PYTHON_ID_GENERATOR,
     OTEL_TRACES_EXPORTER,
 )
@@ -45,9 +46,6 @@
 _RANDOM_ID_GENERATOR = "random"
 _DEFAULT_ID_GENERATOR = _RANDOM_ID_GENERATOR
 
-# TODO: add log exporter env variable
-_OTEL_LOGS_EXPORTER = "OTEL_LOGS_EXPORTER"
-
 
 def _get_id_generator() -> str:
     return environ.get(OTEL_PYTHON_ID_GENERATOR, _DEFAULT_ID_GENERATOR)
@@ -175,7 +173,7 @@ def _import_id_generator(id_generator_name: str) -> IdGenerator:
 def _initialize_components(auto_instrumentation_version):
     trace_exporters, log_exporters = _import_exporters(
         _get_exporter_names(environ.get(OTEL_TRACES_EXPORTER)),
-        _get_exporter_names(environ.get(_OTEL_LOGS_EXPORTER)),
+        _get_exporter_names(environ.get(OTEL_LOGS_EXPORTER)),
     )
     id_generator_name = _get_id_generator()
     id_generator = _import_id_generator(id_generator_name)