v3_preview applied for lowercase normalization for <name> in servlet.… (#17822)

Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

Author: IswaryaIyapalam

instrumentation/servlet/servlet-common/library/src/main/java/io/opentelemetry/instrumentation/servlet/internal/ServletRequestParametersExtractor.java

@@ -9,6 +9,7 @@
 import io.opentelemetry.api.common.AttributesBuilder;
 import io.opentelemetry.context.Context;
 import io.opentelemetry.instrumentation.api.instrumenter.AttributesExtractor;
+import io.opentelemetry.instrumentation.api.internal.SemconvStability;
 import java.util.Collection;
 import java.util.List;
 import java.util.Locale;
@@ -72,9 +73,11 @@ private static AttributeKey<List<String>> parameterAttributeKey(String headerNam
   }
 
   private static AttributeKey<List<String>> createKey(String parameterName) {
-    // normalize parameter name similarly as is done with header names when header values are
-    // captured as span attributes
-    parameterName = parameterName.toLowerCase(Locale.ROOT);
+    if (!SemconvStability.v3Preview()) {
+      // normalize parameter name similarly as is done with header names when header values are
+      // captured as span attributes
+      parameterName = parameterName.toLowerCase(Locale.ROOT);
+    }
     String key = "servlet.request.parameter." + parameterName;
     return AttributeKey.stringArrayKey(key);
   }