refactor

Signed-off-by: Nayeem Kamal <[email protected]>

Author: nayeem-kamal

dd-java-agent/agent-llmobs/src/main/java/datadog/trace/llmobs/LLMObsSystem.java

@@ -202,8 +202,15 @@ public LLMObsSpan startEmbeddingSpan(
       DDLLMObsSpan embeddingSpan =
           new DDLLMObsSpan(
               Tags.LLMOBS_EMBEDDING_SPAN_KIND, spanName, getMLApp(mlApp), sessionId, serviceName);
-      embeddingSpan.setTag(LLMObsTags.MODEL_PROVIDER, modelProvider);
+      if (modelName == null || modelName.isEmpty()) {
+        modelName = CUSTOM_MODEL_VAL;
+      }
       embeddingSpan.setTag(LLMObsTags.MODEL_NAME, modelName);
+
+      if (modelProvider == null || modelProvider.isEmpty()) {
+        modelProvider = CUSTOM_MODEL_VAL;
+      }
+      embeddingSpan.setTag(LLMObsTags.MODEL_PROVIDER, modelProvider);
       return embeddingSpan;
     }