[openai] Remove references to openai.api.usage metrics (#21696)

* [openai] Remove references to openai.api.usage metrics

* Apply suggestions from code review

Co-authored-by: Bryce Eadie <[email protected]>

* Apply suggestions from code review

Co-authored-by: Bryce Eadie <[email protected]>

* update costs dashboard

* changelog formatting

* update dashboard

* date format

* reverse changelog order

---------

Co-authored-by: Bryce Eadie <[email protected]>

Author: BoyangHuang

openai/CHANGELOG.md

@@ -1,8 +1,21 @@
 # CHANGELOG - OpenAI
 
+## 3.0.0 / 2025-10-18
+
+***Removed***:
+
+* Remove support for project-scoped API keys tracking usage metrics.
+* Remove OOTB assets like dashboards and monitors related to project-scoped API keys.
+
+## 2.0.0 / 2025-08-26
+
+***Added***:
+
+* Add admin-scoped API key support for usage and cost data ingestion. This ingests data for all projects in the organization if an admin-scoped API is provided.
+* Add an OOTB dashboard that leverages new usage metrics provided by admin-scoped API keys.
 
 ## 1.0.0
 
 ***Added***:
 
-* Initial release.
+* Initial release.

openai/README.md

@@ -13,7 +13,7 @@ Get cost estimation, prompt and completion sampling, error tracking, performance
 <!-- xxx tabs xxx -->
 <!-- xxx tab "API Key" xxx -->
 
-**Note**: Providing an admin key only collects `audio_speeches`, `audio_transcriptions`, `code_interpreter_sessions`, `completions`, `embeddings`, `images`, `moderations`, and `vector_stores` metrics. Providing a project key is deprecated, and only collects `openai.api.usage.*` metrics. To collect all metrics provided by this integration, also follow the APM setup instructions.
+**Note**: Providing an admin key collects `audio_speeches`, `audio_transcriptions`, `code_interpreter_sessions`, `completions`, `embeddings`, `images`, `moderations`, and `vector_stores` metrics. To collect all metrics provided by this integration, also follow the APM setup instructions.
 
 ### Installation
 
@@ -67,7 +67,7 @@ Datadog's OpenAI integration allows you to collect usage metrics, cost data, and
 <!-- xxz tab xxx -->
 <!-- xxx tab "Python" xxx -->
 
-**Note**: This setup method does not collect `openai.api.usage.*` metrics. To collect these metrics, also follow the API key setup instructions.
+**Note**: This setup method does not collect `audio_speeches`, `audio_transcriptions`, `code_interpreter_sessions`, `completions`, `embeddings`, `images`, `moderations`, and `vector_stores` metrics. To collect these metrics, also follow the API key setup instructions.
 
 ### Installation