Add comment about custom attributes

Author: drewby

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

@@ -173,7 +173,7 @@ def traced_method(wrapped, instance, args, kwargs):
             )
         }
 
-        # Set embeddings dimensions if specified in the request
+        # Using a custom attribute "gen_ai.embeddings.dimensions". Will propose to semantic conventions.
         if "dimensions" in kwargs and kwargs["dimensions"] is not None:
             span_attributes["gen_ai.embeddings.dimensions"] = kwargs[
                 "dimensions"

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

@@ -245,6 +245,7 @@ def get_llm_request_attributes(
             attributes["gen_ai.embeddings.dimensions"] = kwargs["dimensions"]
 
         # Add encoding format if specified
+        # Using a custom attribute "gen_ai.embeddings.encoding_format". Will propose to semantic conventions.
         if "encoding_format" in kwargs:
             attributes["gen_ai.embeddings.encoding_format"] = kwargs[
                 "encoding_format"