Made static fields final

Author: obenkenobi

instrumentation/netty-4.1.16/src/main/java/com/agent/instrumentation/netty4116/NettyUtil.java

@@ -22,9 +22,9 @@ public class NettyUtil {
     // This config is added so customers can also start netty transactions at a lower level.
     // However, this risks netty producing transactions with 'unknown' urls.
     // Only use it if it provides the coverage you need for your application's use case.
-    public static Boolean START_HTTP2_FRAME_READ_LISTENER_TXN =
+    public static final Boolean START_HTTP2_FRAME_READ_LISTENER_TXN =
             NewRelic.getAgent().getConfig().getValue("netty.http2.frame_read_listener.start_transaction", false);
-    public static Boolean START_HTTP2_FRAME_CODEC_TXN = !START_HTTP2_FRAME_READ_LISTENER_TXN;
+    public static final Boolean START_HTTP2_FRAME_CODEC_TXN = !START_HTTP2_FRAME_READ_LISTENER_TXN;
 
     public static String getNettyVersion() {
         return "4.1.16";