Fix the span name of LLM invocations

Change-Id: I1b9f40e5576e699b1f61fa3d7e7790ee4b1448a5
Co-developed-by: Cursor <[email protected]>

Author: Cirilla-zmh

util/opentelemetry-util-genai/src/opentelemetry/util/genai/handler.py

@@ -70,9 +70,6 @@
     get_logger,
 )
 from opentelemetry.metrics import MeterProvider, get_meter
-from opentelemetry.semconv._incubating.attributes import (
-    gen_ai_attributes as GenAI,
-)
 from opentelemetry.semconv.schemas import Schemas
 from opentelemetry.trace import (
     Span,
@@ -141,7 +138,7 @@ def start_llm(
         """Start an LLM invocation and create a pending span entry."""
         # Create a span and attach it as current; keep the token to detach later
         span = self._tracer.start_span(
-            name=f"{GenAI.GenAiOperationNameValues.CHAT.value} {invocation.request_model}",
+            name=f"{invocation.operation_name} {invocation.request_model}",
             kind=SpanKind.CLIENT,
         )
         # Record a monotonic start timestamp (seconds) for duration

util/opentelemetry-util-genai/src/opentelemetry/util/genai/types.py

@@ -24,6 +24,10 @@
 from opentelemetry.context import Context
 from opentelemetry.trace import Span
 
+from opentelemetry.semconv._incubating.attributes import (
+    gen_ai_attributes as GenAI,
+)
+
 ContextToken: TypeAlias = Token[Context]
 
 
@@ -182,6 +186,8 @@ class LLMInvocation:
     """
 
     request_model: str
+    # Chat by default
+    operation_name: str = GenAI.GenAiOperationNameValues.CHAT.value
     context_token: ContextToken | None = None
     span: Span | None = None
     input_messages: list[InputMessage] = field(