From b12ba64baa4e1386a68103529dc284d94b49fa55 Mon Sep 17 00:00:00 2001
From: lindseyr <lindseyr@netflix.com>
Date: Thu, 19 Oct 2023 08:41:37 -0700
Subject: [PATCH] Add metrics for frames passed through userEventTriggered

---
 .../common/metrics/Http2MetricsChannelHandlers.java   | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/zuul-core/src/main/java/com/netflix/netty/common/metrics/Http2MetricsChannelHandlers.java b/zuul-core/src/main/java/com/netflix/netty/common/metrics/Http2MetricsChannelHandlers.java
index 1fdf1072e3..33e6eff9e3 100644
--- a/zuul-core/src/main/java/com/netflix/netty/common/metrics/Http2MetricsChannelHandlers.java
+++ b/zuul-core/src/main/java/com/netflix/netty/common/metrics/Http2MetricsChannelHandlers.java
@@ -93,6 +93,17 @@ public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception
             }
         }
 
+        @Override
+        public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
+            try {
+                if (evt instanceof Http2Frame) {
+                    incrementCounter(registry, frameCounterName, metricId, (Http2Frame) evt);
+                }
+            } finally {
+                super.userEventTriggered(ctx, evt);
+            }
+        }
+
         @Override
         public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
             try {