rollback dd trace (#11736)

Author: ishaan-jaff

requirements.txt

@@ -20,7 +20,7 @@ google-generativeai==0.5.0 # for vertex ai calls
 async_generator==1.10.0 # for async ollama calls
 langfuse==2.45.0 # for langfuse self-hosted logging
 prometheus_client==0.20.0 # for /metrics endpoint on proxy
-ddtrace==3.8.0      # for advanced DD tracing / profiling
+ddtrace==2.19.0      # for advanced DD tracing / profiling
 orjson==3.10.12 # fast /embedding responses
 apscheduler==3.10.4 # for resetting budget in background 
 fastapi-sso==0.16.0 # admin UI, SSO