OpenTelemetry metrics exporter keeps getting configured and running with errors, no matter how hard I try to disable it

Describe your environment

OS: Ubuntu 24
Python version: Python 3.12
SDK version: 1.35.0
API version: 1.35.0

What happened?

https://github.com/hiddenswitch/ComfyUI/actions/runs/16331620030/job/46135318855
I'm getting spammed with /v1/metrics errors. I don't know why these started appearing, but I don't want to configure metrics at all.

rror: -16 22:27:41 [opentelemetry.sdk.metrics._internal.export] [ERROR] [__init__.py:554] Exception while exporting metrics
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/dist-packages/urllib3/connection.py", line 203, in _new_conn
    sock = connection.create_connection(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/urllib3/util/connection.py", line 85, in create_connection
    raise err
  File "/usr/local/lib/python3.12/dist-packages/urllib3/util/connection.py", line 73, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/dist-packages/urllib3/connectionpool.py", line 791, in urlopen
    response = self._make_request(
               ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/urllib3/connectionpool.py", line 497, in _make_request
    conn.request(
  File "/usr/local/lib/python3.12/dist-packages/urllib3/connection.py", line 395, in request
    self.endheaders()
  File "/usr/lib/python3.12/http/client.py", line 1331, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.12/http/client.py", line 1091, in _send_output
    self.send(msg)
  File "/usr/lib/python3.12/http/client.py", line 1035, in send
    self.connect()
  File "/usr/local/lib/python3.12/dist-packages/urllib3/connection.py", line 243, in connect
    self.sock = self._new_conn()
                ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/urllib3/connection.py", line 218, in _new_conn
    raise NewConnectionError(
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x748912519be0>: Failed to establish a new connection: [Errno 111] Connection refused
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/dist-packages/requests/adapters.py", line 667, in send
    resp = conn.urlopen(
           ^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/urllib3/connectionpool.py", line 845, in urlopen
    retries = retries.increment(
              ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/urllib3/util/retry.py", line 515, in increment
    raise MaxRetryError(_pool, url, reason) from reason  # type: ignore[arg-type]
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='localhost', port=4318): Max retries exceeded with url: /v1/metrics (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x748912519be0>: Failed to establish a new connection: [Errno 111] Connection refused'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/dist-packages/opentelemetry/sdk/metrics/_internal/export/__init__.py", line 550, in _receive_metrics
    self._exporter.export(
  File "/usr/local/lib/python3.12/dist-packages/opentelemetry/exporter/otlp/proto/http/metric_exporter/__init__.py", line 339, in export
    resp = self._export(serialized_data.SerializeToString())
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/opentelemetry/exporter/otlp/proto/http/metric_exporter/__init__.py", line 185, in _export
    return self._session.post(
           ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/requests/sessions.py", line 637, in post
    return self.request("POST", url, data=data, json=json, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/requests/sessions.py", line 589, in request
    resp = self.send(prep, **send_kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/opentelemetry/instrumentation/requests/__init__.py", line 228, in instrumented_send
    return wrapped_send(self, request, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/requests/sessions.py", line 703, in send
    r = adapter.send(request, **kwargs)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/requests/adapters.py", line 700, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='localhost', port=4318): Max retries exceeded with url: /v1/metrics (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x748912519be0>: Failed to establish a new connection: [Errno 111] Connection refused'))

Steps to Reproduce

if 'OTEL_METRICS_EXPORTER' not in os.environ:
    os.environ['OTEL_METRICS_EXPORTER'] = 'none'
...
def _create_tracer():
    resource = Resource.create({
        service_attributes.SERVICE_NAME: args.otel_service_name,
        service_attributes.SERVICE_VERSION: args.otel_service_version,
    })

    # omit progress spans from aio pika
    sampler = ProgressSpanSampler()
    provider = TracerProvider(resource=resource, sampler=sampler)

    has_endpoint = args.otel_exporter_otlp_endpoint is not None

    if has_endpoint:
        otlp_exporter = OTLPSpanExporter()
    else:
        otlp_exporter = SpanExporter()

    processor = BatchSpanProcessor(otlp_exporter)
    provider.add_span_processor(processor)

    trace.set_tracer_provider(provider)

    # enable instrumentation
    patch_spanbuilder_set_channel()
    AioPikaInstrumentor().instrument()
    AioHttpServerInstrumentor().instrument()
    RequestsInstrumentor().instrument()
    return trace.get_tracer(args.otel_service_name)

from https://github.com/hiddenswitch/ComfyUI/blob/master/comfy/cmd/main_pre.py

Expected Result

I don't want to export metrics... nothing I am trying is preventing metrics from being exported!

Actual Result

Spam about /v1/metrics

Additional context

I haven't changed anything about my otel setup in the test environment.

Would you like to implement a fix?

Yes

Start with the metrics exporter configuration path in the Python SDK and compare it with the reproduction in comfy/cmd/main_pre.py, especially the OTEL_METRICS_EXPORTER=none environment setting. Trace why the OTLP metrics exporter is still initialized and review the shown export traceback. Done means disabling metrics prevents requests to /v1/metrics and the repeated export errors.