fix(scores): skip sampling if OTEL sampler not available (#1241)

Author: hassiebp

langfuse/_client/resource_manager.py

@@ -277,20 +277,26 @@ def add_score_task(self, event: dict, *, force_sample: bool = False):
         try:
             # Sample scores with the same sampler that is used for tracing
             tracer_provider = cast(TracerProvider, otel_trace_api.get_tracer_provider())
-            should_sample = force_sample or (
-                (
-                    tracer_provider.sampler.should_sample(
-                        parent_context=None,
-                        trace_id=int(event["body"].trace_id, 16),
-                        name="score",
-                    ).decision
-                    == Decision.RECORD_AND_SAMPLE
-                    if hasattr(event["body"], "trace_id")
+            should_sample = (
+                force_sample
+                or isinstance(
+                    tracer_provider, otel_trace_api.ProxyTracerProvider
+                )  # default to in-sample if otel sampler is not available
+                or (
+                    (
+                        tracer_provider.sampler.should_sample(
+                            parent_context=None,
+                            trace_id=int(event["body"].trace_id, 16),
+                            name="score",
+                        ).decision
+                        == Decision.RECORD_AND_SAMPLE
+                        if hasattr(event["body"], "trace_id")
+                        else True
+                    )
+                    if event["body"].trace_id
+                    is not None  # do not sample out session / dataset run scores
                     else True
                 )
-                if event["body"].trace_id
-                is not None  # do not sample out session / dataset run scores
-                else True
             )
 
             if should_sample: