Add JMXFetch to TracerInstaller for GraalVM Native

Error: Discovered unresolved method during parsing: org.datadog.jmxfetch.App.<init>(org.datadog.jmxfetch.AppConfig).

Author: ygree

dd-java-agent/agent-bootstrap/src/main/java/datadog/trace/bootstrap/Agent.java

@@ -178,12 +178,11 @@ public static void start(
     createAgentClassloader(agentJarURL);
 
     if (Platform.isNativeImageBuilder()) {
-      // these default services are not used during native-image builds
-      jmxFetchEnabled = false;
-      remoteConfigEnabled = false;
-      telemetryEnabled = false;
-      // apply trace instrumentation, but skip starting other services
+      // apply trace instrumentation at native-image build time
       startDatadogAgent(initTelemetry, inst);
+      // TODO: are we sure we want measure native-image build instrumentation?
+      //  This is very different, happens at build time and doesn't include any service
+      // initialization time.
       StaticEventLogger.end("Agent.start");
 
       return;

dd-java-agent/agent-tooling/build.gradle

@@ -41,6 +41,7 @@ dependencies {
   api(project(':dd-java-agent:agent-bootstrap')) {
     exclude group: 'com.datadoghq', module: 'agent-logging'
   }
+  compileOnly project(':dd-java-agent:agent-jmxfetch')
   compileOnly project(':dd-java-agent:agent-profiling')
   api group: 'com.blogspot.mydailyjava', name: 'weak-lock-free', version: '0.17'
   api libs.bytebuddy

dd-java-agent/agent-tooling/src/main/java/datadog/trace/agent/tooling/TracerInstaller.java

@@ -1,8 +1,11 @@
 package datadog.trace.agent.tooling;
 
 import datadog.communication.ddagent.SharedCommunicationObjects;
+import datadog.communication.monitor.DDAgentStatsDClientManager;
+import datadog.trace.agent.jmxfetch.JMXFetch;
 import datadog.trace.api.Config;
 import datadog.trace.api.GlobalTracer;
+import datadog.trace.api.StatsDClientManager;
 import datadog.trace.bootstrap.instrumentation.api.AgentTracer;
 import datadog.trace.bootstrap.instrumentation.api.ProfilingContextIntegration;
 import datadog.trace.core.CoreTracer;
@@ -25,6 +28,9 @@ public static synchronized void installGlobalTracer(
                 .pollForTracingConfiguration()
                 .build();
         installGlobalTracer(tracer);
+
+        StatsDClientManager statsDClientManager = DDAgentStatsDClientManager.statsDClientManager();
+        JMXFetch.run(statsDClientManager);
       } else {
         log.debug("GlobalTracer already registered.");
       }

dd-java-agent/instrumentation/graal/native-image/src/main/java/datadog/trace/instrumentation/graal/nativeimage/ResourcesFeatureInstrumentation.java

@@ -43,7 +43,9 @@ public static void onExit() {
         "profiling/jfr/dd.jfp",
         "profiling/jfr/safepoints.jfp",
         "profiling/jfr/overrides/comprehensive.jfp",
-        "profiling/jfr/overrides/minimal.jfp"
+        "profiling/jfr/overrides/minimal.jfp",
+        "metrics/project.properties" // JMXFetch version file needed for
+        // org.datadog.jmxfetch.AppConfig
       };
 
       for (String original : tracerResources) {