openai_agents OTel bridge logs "Failed to detach context" whenever a temporal:startActivity span finishes

[DABH]

Component: temporalio.contrib.openai_agents with OpenAIAgentsPlugin(use_otel_instrumentation=True) (SDK 1.32.0).

With OpenTelemetry instrumentation enabled, worker logs fill with ERROR opentelemetry.context: Failed to detach context tracebacks, one every time a temporal:startActivity span (likewise temporal:startChildWorkflow and temporal:startLocalActivity) finishes. The span is started in the workflow task's contextvars Context but finished from the activity handle's done callback, which asyncio runs in a copy of that Context, so the OpenInference processor cannot detach the OpenTelemetry context it attached when the span started. The fix (#1856) starts and finishes the span in one dedicated Context. Tracing output itself is correct; the errors are noise, but at ERROR level and frequent.

Technical details

openinference-instrumentation-openai-agents does self._tokens[span.span_id] = attach(...) in on_span_start and detach(token) in on_span_end. The SDK's tracing interceptor starts the temporal:start* spans synchronously with span.start(mark_as_current=True) and finishes them with handle.add_done_callback(lambda _: span.finish()). Future.add_done_callback captures contextvars.copy_context() and runs the callback in that copy, where ContextVar.reset(token) raises ValueError: ... was created in a different Context; opentelemetry.context.detach catches it and logs the traceback. Agent, turn and task spans start and finish in the same task Context and are not affected; workflow task boundaries and replay are not the trigger, though with max_cached_workflows=0 each span errors once more when the evicted run's handle is cancelled.

ERROR opentelemetry.context: Failed to detach context
Traceback (most recent call last):
  File ".../opentelemetry/context/__init__.py", line 143, in detach
    _RUNTIME_CONTEXT.detach(token)
  File ".../opentelemetry/context/contextvars_context.py", line 42, in detach
    self._current_context.reset(token)
ValueError: <Token var=<ContextVar name='current_context' default={} at 0x...> at 0x...> was created in a different Context

Repro: any workflow that runs Runner.run(agent) with the plugin above and add_temporal_spans at its default (True); watch the worker's log output. Workaround until the fix is released: a logging filter on the opentelemetry.context logger that drops records starting with Failed to detach context.