feat(opentelemetry.py): support logging call metadata to otel

litellm/integrations/opentelemetry.py

@@ -288,6 +288,11 @@ class OpenTelemetry(CustomLogger):
             )
             pass
 
+    def is_primitive(self, value):
+        if value is None:
+            return False
+        return isinstance(value, (str, bool, int, float))
+
     def set_attributes(self, span: Span, kwargs, response_obj):
         from litellm.proxy._types import SpanAttributes
 
@@ -296,6 +301,14 @@ class OpenTelemetry(CustomLogger):
 
         # https://github.com/open-telemetry/semantic-conventions/blob/main/model/registry/gen-ai.yaml
         # Following Conventions here: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/gen-ai/llm-spans.md
+        #############################################
+        ############ LLM CALL METADATA ##############
+        #############################################
+        metadata = litellm_params.get("metadata", {}) or {}
+
+        for key, value in metadata.items():
+            if self.is_primitive(value):
+                span.set_attribute("metadata.{}".format(key), value)
 
         #############################################
         ########## LLM Request Attributes ###########
@@ -474,8 +487,6 @@ class OpenTelemetry(CustomLogger):
                     _raw_response,
                 )
 
-        pass
-
     def _to_ns(self, dt):
         return int(dt.timestamp() * 1e9)