Fails to connect to open-telemetry in `devel` mode and tests show a lot of warnings

[pcrespov]

webserver cannot connect to open telemetry in devel mode

1. build and deploy stack in devel mode

make clean
make build-devel-nc
make up-devel

2. open portainer and check web-server logs. It fails constantly with

requests.exceptions.ConnectionError: HTTPConnectionPool(host='opentelemetry-collector', port=80): Max retries exceeded with url: /:4318/v1/traces (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x72589695ead0>: Failed to establish a new connection: [Errno 111] Connection refused'))

I guess the endpoints in the .env-devel are not correct?

I expect the .env-devel to work as-is for the stack when deployed in devel mode

[mrnicegyu11]

I cannot reproduce this, I dont see this error in the webserver in develmode :--( Please update and re-assigne, thx

[pcrespov]

and the tests also swho a lot of failures

 _    _        _
| |  | |      | |
| |  | |  ___ | |__   ___   ___  _ __ __   __ ___  _ __
| |/\| | / _ \| '_ \ / __| / _ \| '__|\ \ / // _ \| '__|
\  /\  /|  __/| |_) |\__ \|  __/| |    \ V /|  __/| |
 \/  \/  \___||_.__/ |___/ \___||_|     \_/  \___||_|     v0.71.0

ERROR: [2025-07-11 11:50:25,454/MainProcess] [log_trace_id=0 log_span_id=0 log_resource.service.name= log_trace_sampled=False] [opentelemetry.sdk._shared_internal:_export(165)] -  Exception while exporting Span.
Traceback (most recent call last):
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connection.py", line 198, in _new_conn
    sock = connection.create_connection(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/util/connection.py", line 60, in create_connection
    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/socket.py", line 962, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
socket.gaierror: [Errno -2] Name or service not known

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 787, in urlopen
    response = self._make_request(
               ^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 493, in _make_request
    conn.request(
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connection.py", line 494, in request
    self.endheaders()
  File "/usr/local/lib/python3.11/http/client.py", line 1298, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.11/http/client.py", line 1058, in _send_output
    self.send(msg)
  File "/usr/local/lib/python3.11/http/client.py", line 996, in send
    self.connect()
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connection.py", line 325, in connect
    self.sock = self._new_conn()
                ^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connection.py", line 205, in _new_conn
    raise NameResolutionError(self.host, self, e) from e
urllib3.exceptions.NameResolutionError: <urllib3.connection.HTTPConnection object at 0x732cc1e812d0>: Failed to resolve 'opentelemetry-collector' ([Errno -2] Name or service not known)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/adapters.py", line 667, in send
    resp = conn.urlopen(
           ^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 841, in urlopen
    retries = retries.increment(
              ^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/util/retry.py", line 519, in increment
    raise MaxRetryError(_pool, url, reason) from reason  # type: ignore[arg-type]
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='opentelemetry-collector', port=4318): Max retries exceeded with url: /v1/traces (Caused by NameResolutionError("<urllib3.connection.HTTPConnection object at 0x732cc1e812d0>: Failed to resolve 'opentelemetry-collector' ([Errno -2] Name or service not known)"))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/scu/.venv/lib/python3.11/site-packages/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py", line 139, in _export
    resp = self._session.post(
           ^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/sessions.py", line 637, in post
    return self.request("POST", url, data=data, json=json, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/sessions.py", line 589, in request
    resp = self.send(prep, **send_kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/opentelemetry/instrumentation/requests/__init__.py", line 228, in instrumented_send
    return wrapped_send(self, request, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/sessions.py", line 703, in send
    r = adapter.send(request, **kwargs)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/adapters.py", line 700, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='opentelemetry-collector', port=4318): Max retries exceeded with url: /v1/traces (Caused by NameResolutionError("<urllib3.connection.HTTPConnection object at 0x732cc1e812d0>: Failed to resolve 'opentelemetry-collector' ([Errno -2] Name or service not known)"))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connection.py", line 198, in _new_conn
    sock = connection.create_connection(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/util/connection.py", line 60, in create_connection
    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/socket.py", line 962, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
socket.gaierror: [Errno -2] Name or service not known

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 787, in urlopen
    response = self._make_request(
               ^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 493, in _make_request
    conn.request(
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connection.py", line 494, in request
    self.endheaders()
  File "/usr/local/lib/python3.11/http/client.py", line 1298, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.11/http/client.py", line 1058, in _send_output
    self.send(msg)
  File "/usr/local/lib/python3.11/http/client.py", line 996, in send
    self.connect()
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connection.py", line 325, in connect
    self.sock = self._new_conn()
                ^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connection.py", line 205, in _new_conn
    raise NameResolutionError(self.host, self, e) from e
urllib3.exceptions.NameResolutionError: <urllib3.connection.HTTPConnection object at 0x732cbc103050>: Failed to resolve 'opentelemetry-collector' ([Errno -2] Name or service not known)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/adapters.py", line 667, in send
    resp = conn.urlopen(
           ^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 841, in urlopen
    retries = retries.increment(
              ^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/urllib3/util/retry.py", line 519, in increment
    raise MaxRetryError(_pool, url, reason) from reason  # type: ignore[arg-type]
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='opentelemetry-collector', port=4318): Max retries exceeded with url: /v1/traces (Caused by NameResolutionError("<urllib3.connection.HTTPConnection object at 0x732cbc103050>: Failed to resolve 'opentelemetry-collector' ([Errno -2] Name or service not known)"))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/scu/.venv/lib/python3.11/site-packages/opentelemetry/sdk/_shared_internal/__init__.py", line 152, in _export
    self._exporter.export(
  File "/home/scu/.venv/lib/python3.11/site-packages/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py", line 204, in export
    return self._export_serialized_spans(serialized_data)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py", line 174, in _export_serialized_spans
    resp = self._export(serialized_data)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py", line 147, in _export
    resp = self._session.post(
           ^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/sessions.py", line 637, in post
    return self.request("POST", url, data=data, json=json, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/sessions.py", line 589, in request
    resp = self.send(prep, **send_kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/opentelemetry/instrumentation/requests/__init__.py", line 228, in instrumented_send
    return wrapped_send(self, request, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/sessions.py", line 703, in send
    r = adapter.send(request, **kwargs)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/scu/.venv/lib/python3.11/site-packages/requests/adapters.py", line 700, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='opentelemetry-collector', port=4318): Max retries exceeded with url: /v1/traces (Caused by NameResolutionError("<urllib3.connection.HTTPConnection object at 0x732cbc103050>: Failed to resolve 'opentelemetry-collector' ([Errno -2] Name or service not known)"))