Check LRU cache before acquiring the semaphore/thread to upload a file (open-telemetry#3907)

* initial commit

* Add changelog

* Respond to comments

Author: DylanRussell

instrumentation-genai/opentelemetry-instrumentation-google-genai/CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Minor change to check LRU cache in Completion Hook before acquiring semaphore/thread ([#3907](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3907)).
+
 ## Version 0.4b0 (2025-10-16)
 
 - Implement the new semantic convention changes made in https://github.com/open-telemetry/semantic-conventions/pull/2179.

util/opentelemetry-util-genai/src/opentelemetry/util/genai/_upload/completion_hook.py

@@ -149,6 +149,9 @@ def done(future: Future[None]) -> None:
             path,
             contents_hashed_to_filename,
         ), json_encodeable in upload_data.items():
+            if contents_hashed_to_filename and path in self.lru_dict:
+                self.lru_dict.move_to_end(path)
+                continue
             # could not acquire, drop data
             if not self._semaphore.acquire(blocking=False):  # pylint: disable=consider-using-with
                 _logger.warning(