From 9e0bedbb5f520d51759d50aa08d8afa8a4a3a89a Mon Sep 17 00:00:00 2001
From: Dmitry Kaukov <dkaukov@opentable.com>
Date: Mon, 10 Jun 2024 07:51:35 +1000
Subject: [PATCH] Fix Jetty 12.x QueuedThreadPool metrics (#4181)

---
 .../metrics/jetty12/InstrumentedQueuedThreadPool.java    | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/metrics-jetty12/src/main/java/io/dropwizard/metrics/jetty12/InstrumentedQueuedThreadPool.java b/metrics-jetty12/src/main/java/io/dropwizard/metrics/jetty12/InstrumentedQueuedThreadPool.java
index 99117378fa..31cdbf6884 100644
--- a/metrics-jetty12/src/main/java/io/dropwizard/metrics/jetty12/InstrumentedQueuedThreadPool.java
+++ b/metrics-jetty12/src/main/java/io/dropwizard/metrics/jetty12/InstrumentedQueuedThreadPool.java
@@ -127,15 +127,10 @@ protected void doStart() throws Exception {
         metricRegistry.register(name(prefix, NAME_UTILIZATION), new RatioGauge() {
             @Override
             protected Ratio getRatio() {
-                return Ratio.of(getThreads() - getIdleThreads(), getThreads());
-            }
-        });
-        metricRegistry.register(name(prefix, NAME_UTILIZATION_MAX), new RatioGauge() {
-            @Override
-            protected Ratio getRatio() {
-                return Ratio.of(getThreads() - getIdleThreads(), getMaxThreads());
+                return  Ratio.of(getUtilizedThreads(), getThreads() - getLeasedThreads());
             }
         });
+        metricRegistry.registerGauge(name(prefix, NAME_UTILIZATION_MAX), this::getUtilizationRate);
         metricRegistry.registerGauge(name(prefix, NAME_SIZE), this::getThreads);
         // This assumes the QueuedThreadPool is using a BlockingArrayQueue or
         // ArrayBlockingQueue for its queue, and is therefore a constant-time operation.