Going with factory function approach w/ 2 entry points

exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/exporter.py

@@ -188,7 +188,7 @@ def _get_credentials(
                         name=credential_env,
                     )
                 )
-            ).load()("GRPC")
+            ).load()()
         except StopIteration:
             raise RuntimeError(
                 f"Requested component '{credential_env}' not found in "

exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/_common/__init__.py

@@ -53,7 +53,7 @@ def _load_session_from_envvar(
                         name=credential_env,
                     )
                 )
-            ).load()("HTTP")
+            ).load()()
         except StopIteration:
             raise RuntimeError(
                 f"Requested component '{credential_env}' not found in "