openai-v2: import OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT from genai-utils (#4455)

* openai-v2: import OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT from genai-utils

Remove local re-definition of OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT
and import it from opentelemetry.util.genai.environment_variables instead,
making genai-utils the single source of truth for this constant.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* openai-v2: add CHANGELOG entry for #4455

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Apply suggestion from @xrmx

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>

Author: 3 people

instrumentation-genai/opentelemetry-instrumentation-openai-v2/CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Import `OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT` from
+  `opentelemetry.util.genai.environment_variables` instead of re-defining it locally,
+  making `opentelemetry-util-genai` the single source of truth for this constant.
+  ([#4455](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4455))
 - Fix compatibility with wrapt 2.x by using positional arguments in `wrap_function_wrapper()` calls
   ([#4445](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4445))
 - Fix `ChoiceBuffer` crash on streaming tool-call deltas with `arguments=None`

instrumentation-genai/opentelemetry-instrumentation-openai-v2/src/opentelemetry/instrumentation/openai_v2/utils.py

@@ -36,6 +36,9 @@
     error_attributes as ErrorAttributes,
 )
 from opentelemetry.trace.status import Status, StatusCode
+from opentelemetry.util.genai.environment_variables import (
+    OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT,
+)
 from opentelemetry.util.genai.types import (
     InputMessage,
     LLMInvocation,  # pylint: disable=no-name-in-module  # TODO: migrate to InferenceInvocation
@@ -45,10 +48,6 @@
     ToolCallResponse,
 )
 
-OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT = (
-    "OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT"
-)
-
 
 def is_content_enabled() -> bool:
     capture_content = environ.get(