test changes

Author: nhulston

internal/trace/context.go

@@ -146,21 +146,21 @@ func getTraceContext(ctx context.Context, headers map[string]string) (TraceConte
 			parentID = val
 		}
 	}
-	if parentID == "" {
-		return tc, false
-	}
-
 	samplingPriority := headers[samplingPriorityHeader]
 	if samplingPriority == "" {
 		if val, ok := ctx.Value(extension.DdSamplingPriority).(string); ok {
 			samplingPriority = val
 		}
 	}
-	if samplingPriority == "" {
-		samplingPriority = "1" //sampler-keep
+	// Remove this default to let tracer sampling rules take effect
+	// if samplingPriority == "" {
+	//     samplingPriority = "1" //sampler-keep
+	// }
+
+	// Only set sampling priority if it was explicitly provided
+	if samplingPriority != "" {
+		tc[samplingPriorityHeader] = samplingPriority
 	}
-
-	tc[samplingPriorityHeader] = samplingPriority
 	tc[traceIDHeader] = traceID
 	tc[parentIDHeader] = parentID