We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
_OTEL_METRICS_EXPORTER env var should be OTEL_METRICS_EXPORTER
The environment variable `_OTEL_METRICS_EXPORTER` is prefixed with an underscore, but there's no need for it as that environment variable is marked as stable in the specification https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md#exporter-selection



--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `opentelemetry-api/src/opentelemetry/environment_variables.py`
Content:
```
1 # Copyright The OpenTelemetry Authors
2 #
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
6 #
7 #     http://www.apache.org/licenses/LICENSE-2.0
8 #
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
14 
15 OTEL_PROPAGATORS = "OTEL_PROPAGATORS"
16 """
17 .. envvar:: OTEL_PROPAGATORS
18 """
19 
20 OTEL_PYTHON_CONTEXT = "OTEL_PYTHON_CONTEXT"
21 """
22 .. envvar:: OTEL_PYTHON_CONTEXT
23 """
24 
25 OTEL_PYTHON_ID_GENERATOR = "OTEL_PYTHON_ID_GENERATOR"
26 """
27 .. envvar:: OTEL_PYTHON_ID_GENERATOR
28 """
29 
30 OTEL_TRACES_EXPORTER = "OTEL_TRACES_EXPORTER"
31 """
32 .. envvar:: OTEL_TRACES_EXPORTER
33 """
34 
35 OTEL_PYTHON_TRACER_PROVIDER = "OTEL_PYTHON_TRACER_PROVIDER"
36 """
37 .. envvar:: OTEL_PYTHON_TRACER_PROVIDER
38 """
39 
40 _OTEL_PYTHON_METER_PROVIDER = "OTEL_PYTHON_METER_PROVIDER"
41 """
42 .. envvar:: OTEL_PYTHON_METER_PROVIDER
43 """
44 
45 _OTEL_METRICS_EXPORTER = "OTEL_METRICS_EXPORTER"
46 """
47 .. envvar:: OTEL_METRICS_EXPORTER
48 
49 """
50
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/opentelemetry-api/src/opentelemetry/environment_variables.py b/opentelemetry-api/src/opentelemetry/environment_variables.py
--- a/opentelemetry-api/src/opentelemetry/environment_variables.py
+++ b/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_METRICS_EXPORTER = "OTEL_METRICS_EXPORTER"
+"""
+.. envvar:: OTEL_METRICS_EXPORTER
+
+"""
+
 OTEL_PROPAGATORS = "OTEL_PROPAGATORS"
 """
 .. envvar:: OTEL_PROPAGATORS
@@ -41,9 +47,3 @@
 """
 .. envvar:: OTEL_PYTHON_METER_PROVIDER
 """
-
-_OTEL_METRICS_EXPORTER = "OTEL_METRICS_EXPORTER"
-"""
-.. envvar:: OTEL_METRICS_EXPORTER
-
-"""

{"golden_diff": "diff --git a/opentelemetry-api/src/opentelemetry/environment_variables.py b/opentelemetry-api/src/opentelemetry/environment_variables.py\n--- a/opentelemetry-api/src/opentelemetry/environment_variables.py\n+++ b/opentelemetry-api/src/opentelemetry/environment_variables.py\n@@ -12,6 +12,12 @@\n # See the License for the specific language governing permissions and\n # limitations under the License.\n \n+OTEL_METRICS_EXPORTER = \"OTEL_METRICS_EXPORTER\"\n+\"\"\"\n+.. envvar:: OTEL_METRICS_EXPORTER\n+\n+\"\"\"\n+\n OTEL_PROPAGATORS = \"OTEL_PROPAGATORS\"\n \"\"\"\n .. envvar:: OTEL_PROPAGATORS\n@@ -41,9 +47,3 @@\n \"\"\"\n .. envvar:: OTEL_PYTHON_METER_PROVIDER\n \"\"\"\n-\n-_OTEL_METRICS_EXPORTER = \"OTEL_METRICS_EXPORTER\"\n-\"\"\"\n-.. envvar:: OTEL_METRICS_EXPORTER\n-\n-\"\"\"\n", "issue": "_OTEL_METRICS_EXPORTER env var should be OTEL_METRICS_EXPORTER\nThe environment variable `_OTEL_METRICS_EXPORTER` is prefixed with an underscore, but there's no need for it as that environment variable is marked as stable in the specification https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md#exporter-selection\r\n\r\n\n", "before_files": [{"content": "# Copyright The OpenTelemetry Authors\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#     http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nOTEL_PROPAGATORS = \"OTEL_PROPAGATORS\"\n\"\"\"\n.. envvar:: OTEL_PROPAGATORS\n\"\"\"\n\nOTEL_PYTHON_CONTEXT = \"OTEL_PYTHON_CONTEXT\"\n\"\"\"\n.. envvar:: OTEL_PYTHON_CONTEXT\n\"\"\"\n\nOTEL_PYTHON_ID_GENERATOR = \"OTEL_PYTHON_ID_GENERATOR\"\n\"\"\"\n.. envvar:: OTEL_PYTHON_ID_GENERATOR\n\"\"\"\n\nOTEL_TRACES_EXPORTER = \"OTEL_TRACES_EXPORTER\"\n\"\"\"\n.. envvar:: OTEL_TRACES_EXPORTER\n\"\"\"\n\nOTEL_PYTHON_TRACER_PROVIDER = \"OTEL_PYTHON_TRACER_PROVIDER\"\n\"\"\"\n.. envvar:: OTEL_PYTHON_TRACER_PROVIDER\n\"\"\"\n\n_OTEL_PYTHON_METER_PROVIDER = \"OTEL_PYTHON_METER_PROVIDER\"\n\"\"\"\n.. envvar:: OTEL_PYTHON_METER_PROVIDER\n\"\"\"\n\n_OTEL_METRICS_EXPORTER = \"OTEL_METRICS_EXPORTER\"\n\"\"\"\n.. envvar:: OTEL_METRICS_EXPORTER\n\n\"\"\"\n", "path": "opentelemetry-api/src/opentelemetry/environment_variables.py"}], "after_files": [{"content": "# Copyright The OpenTelemetry Authors\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#     http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nOTEL_METRICS_EXPORTER = \"OTEL_METRICS_EXPORTER\"\n\"\"\"\n.. envvar:: OTEL_METRICS_EXPORTER\n\n\"\"\"\n\nOTEL_PROPAGATORS = \"OTEL_PROPAGATORS\"\n\"\"\"\n.. envvar:: OTEL_PROPAGATORS\n\"\"\"\n\nOTEL_PYTHON_CONTEXT = \"OTEL_PYTHON_CONTEXT\"\n\"\"\"\n.. envvar:: OTEL_PYTHON_CONTEXT\n\"\"\"\n\nOTEL_PYTHON_ID_GENERATOR = \"OTEL_PYTHON_ID_GENERATOR\"\n\"\"\"\n.. envvar:: OTEL_PYTHON_ID_GENERATOR\n\"\"\"\n\nOTEL_TRACES_EXPORTER = \"OTEL_TRACES_EXPORTER\"\n\"\"\"\n.. envvar:: OTEL_TRACES_EXPORTER\n\"\"\"\n\nOTEL_PYTHON_TRACER_PROVIDER = \"OTEL_PYTHON_TRACER_PROVIDER\"\n\"\"\"\n.. envvar:: OTEL_PYTHON_TRACER_PROVIDER\n\"\"\"\n\n_OTEL_PYTHON_METER_PROVIDER = \"OTEL_PYTHON_METER_PROVIDER\"\n\"\"\"\n.. envvar:: OTEL_PYTHON_METER_PROVIDER\n\"\"\"\n", "path": "opentelemetry-api/src/opentelemetry/environment_variables.py"}]}