add heart beat handler to jetty (#1589)

* add heart beat handler to jetty

* add heart beat handler to jetty

apm-collector/apm-collector-agent/agent-jetty/agent-jetty-provider/src/main/java/org/apache/skywalking/apm/collector/agent/jetty/provider/AgentModuleJettyProvider.java

@@ -21,6 +21,7 @@ package org.apache.skywalking.apm.collector.agent.jetty.provider;
 import org.apache.skywalking.apm.collector.agent.jetty.define.AgentJettyModule;
 import org.apache.skywalking.apm.collector.agent.jetty.provider.handler.ApplicationRegisterServletHandler;
 import org.apache.skywalking.apm.collector.agent.jetty.provider.handler.InstanceDiscoveryServletHandler;
+import org.apache.skywalking.apm.collector.agent.jetty.provider.handler.InstanceHeartBeatServletHandler;
 import org.apache.skywalking.apm.collector.agent.jetty.provider.handler.NetworkAddressRegisterServletHandler;
 import org.apache.skywalking.apm.collector.agent.jetty.provider.handler.ServiceNameDiscoveryServiceHandler;
 import org.apache.skywalking.apm.collector.agent.jetty.provider.handler.TraceSegmentServletHandler;
@@ -92,6 +93,7 @@ public class AgentModuleJettyProvider extends ModuleProvider {
         jettyServer.addHandler(new TraceSegmentServletHandler(getManager()));
         jettyServer.addHandler(new ApplicationRegisterServletHandler(getManager()));
         jettyServer.addHandler(new InstanceDiscoveryServletHandler(getManager()));
+        jettyServer.addHandler(new InstanceHeartBeatServletHandler(getManager()));
         jettyServer.addHandler(new ServiceNameDiscoveryServiceHandler(getManager()));
         jettyServer.addHandler(new NetworkAddressRegisterServletHandler(getManager()));
     }