Changelog entry

Author: drewby

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

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Added support for capturing and reporting system_fingerprint from OpenAI responses
+  ([#XXXX](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/XXXX))
 - Record prompt and completion events regardless of span sampling decision.
   ([#3226](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3226))