jetty select count

Author: SylvainJuge

jmx-scraper/src/integrationTest/java/io/opentelemetry/contrib/jmxscraper/target_systems/JettyIntegrationTest.java

@@ -6,6 +6,7 @@
 package io.opentelemetry.contrib.jmxscraper.target_systems;
 
 import static io.opentelemetry.contrib.jmxscraper.target_systems.MetricAssertions.assertGaugeWithAttributes;
+import static io.opentelemetry.contrib.jmxscraper.target_systems.MetricAssertions.assertSum;
 import static io.opentelemetry.contrib.jmxscraper.target_systems.MetricAssertions.assertSumWithAttributes;
 
 import io.opentelemetry.contrib.jmxscraper.JmxScraperContainer;
@@ -71,6 +72,8 @@ protected void verifyMetrics() {
                 "jetty.session.time.max",
                 "The maximum amount of time a session has been active.",
                 "s",
-                attrs -> attrs.containsKey("resource")));
+                attrs -> attrs.containsKey("resource")),
+        metric ->
+            assertSum(metric, "jetty.select.count", "The number of select calls.", "{operations}"));
   }
 }

jmx-scraper/src/main/resources/jetty.yaml

@@ -2,6 +2,14 @@
 
 rules:
 
+  - bean: org.eclipse.jetty.io:context=*,type=managedselector,id=*
+    mapping:
+      selectCount:
+        metric: jetty.select.count
+        type: counter
+        unit: "{operations}"
+        desc: The number of select calls.
+
   - bean: org.eclipse.jetty.server.session:context=*,type=sessionhandler,id=*
     prefix: jetty.session.
     metricAttribute: