add api for evals

Author: gary-huang

dd-trace-api/build.gradle

@@ -35,6 +35,7 @@ excludedClassesCoverage += [
   'datadog.trace.api.llmobs.LLMObsSpan',
   'datadog.trace.api.llmobs.noop.NoOpLLMObsSpan',
   'datadog.trace.api.llmobs.noop.NoOpLLMObsSpanFactory',
+  'datadog.trace.api.llmobs.noop.NoOpLLMObsEvalProcessor',
   'datadog.trace.api.experimental.DataStreamsCheckpointer',
   'datadog.trace.api.experimental.DataStreamsCheckpointer.NoOp',
   'datadog.trace.api.experimental.DataStreamsContextCarrier',

dd-trace-api/src/main/java/datadog/trace/api/llmobs/LLMObs.java

@@ -1,10 +1,13 @@
 package datadog.trace.api.llmobs;
 
+import datadog.trace.api.llmobs.noop.NoOpLLMObsEvalProcessor;
 import datadog.trace.api.llmobs.noop.NoOpLLMObsSpanFactory;
+import java.util.Map;
 import javax.annotation.Nullable;
 
 public class LLMObs {
   protected static LLMObsSpanFactory SPAN_FACTORY = NoOpLLMObsSpanFactory.INSTANCE;
+  protected static LLMObsEvalProcessor EVAL_PROCESSOR = NoOpLLMObsEvalProcessor.INSTANCE;
 
   public static LLMObsSpan startLLMSpan(
       String spanName,
@@ -40,6 +43,10 @@ public static LLMObsSpan startWorkflowSpan(
     return SPAN_FACTORY.startWorkflowSpan(spanName, mlApp, sessionID);
   }
 
+  public static void SubmitEvaluation(LLMObsSpan llmObsSpan, String label, String categoricalValue, Map<String, Object> tags) {}
+
+  public static void SubmitEvaluation(LLMObsSpan llmObsSpan, String label, double numericalValue, Map<String, Object> tags) {}
+
   public interface LLMObsSpanFactory {
     LLMObsSpan startLLMSpan(
         String spanName,
@@ -57,4 +64,9 @@ LLMObsSpan startLLMSpan(
     LLMObsSpan startWorkflowSpan(
         String spanName, @Nullable String mlApp, @Nullable String sessionID);
   }
+
+  public interface LLMObsEvalProcessor {
+    void SubmitEvaluation(LLMObsSpan llmObsSpan, String label, double numericalValue, Map<String, Object> tags);
+    void SubmitEvaluation(LLMObsSpan llmObsSpan, String label, String categoricalValue, Map<String, Object> tags);
+  }
 }

dd-trace-api/src/main/java/datadog/trace/api/llmobs/noop/NoOpLLMObsEvalProcessor.java

@@ -0,0 +1,15 @@
+package datadog.trace.api.llmobs.noop;
+
+import datadog.trace.api.llmobs.LLMObs;
+import datadog.trace.api.llmobs.LLMObsSpan;
+import java.util.Map;
+
+public class NoOpLLMObsEvalProcessor implements LLMObs.LLMObsEvalProcessor {
+  public static final NoOpLLMObsEvalProcessor INSTANCE = new NoOpLLMObsEvalProcessor();
+
+  @Override
+  public void SubmitEvaluation(LLMObsSpan llmObsSpan, String label, double numericalValue, Map<String, Object> tags) {}
+
+  @Override
+  public void SubmitEvaluation(LLMObsSpan llmObsSpan, String label, String categoricalValue, Map<String, Object> tags) {}
+}