openai-v2: Fix service tier attribute names

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

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Fix service tier attribute names: use `GEN_AI_OPENAI_REQUEST_SERVICE_TIER` for request
+  attributes and `GEN_AI_OPENAI_RESPONSE_SERVICE_TIER` for response attributes.
+  ([#3920](https://github.com/open-telemetry/opentelemetry-python-contrib/issues/3920))
 - Added support for OpenAI embeddings instrumentation
   ([#3461](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3461))
 - Record prompt and completion events regardless of span sampling decision.

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

@@ -370,7 +370,7 @@ def _set_response_attributes(
     if getattr(result, "service_tier", None):
         set_span_attribute(
             span,
-            GenAIAttributes.GEN_AI_OPENAI_REQUEST_SERVICE_TIER,
+            GenAIAttributes.GEN_AI_OPENAI_RESPONSE_SERVICE_TIER,
             result.service_tier,
         )
 

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

@@ -230,8 +230,13 @@ def get_llm_request_attributes(
                     GenAIAttributes.GEN_AI_OPENAI_REQUEST_RESPONSE_FORMAT
                 ] = response_format
 
+        # service_tier can be passed directly or in extra_body (in SDK 1.26.0 it's via extra_body)
         service_tier = kwargs.get("service_tier")
-        attributes[GenAIAttributes.GEN_AI_OPENAI_RESPONSE_SERVICE_TIER] = (
+        if service_tier is None:
+            extra_body = kwargs.get("extra_body")
+            if isinstance(extra_body, Mapping):
+                service_tier = extra_body.get("service_tier")
+        attributes[GenAIAttributes.GEN_AI_OPENAI_REQUEST_SERVICE_TIER] = (
             service_tier if service_tier != "auto" else None
         )