Update: I'm looking for any technical/developer documents which would explain log messages for XMS.

xmserver.log

01:10:21.725158 DEBUG  XmserverCtrlChannelClient::OnNotify() location: "/services/perfmanager" {
01:10:21.725181 DEBUG  ServiceMonitor::SetState() service_name: "perfmanager", state: UNRESPONSIVE
01:10:22.210951 DEBUG  XmserverCtrlChannelClient::OnNotify() location: "/services/perfmanager" {

/var/log/messages shows 

01:10:21 Server01 nodecontroller: 01:10:21.724639 WARN CtrlChannelServer::OnPingTimeout() "perfmanager"
01:10:21 Server01 sysmonitor: 01:10:21.725114 ERROR [perfmanager] transition from [RUNNING] to [UNRESPONSIVE]
01:10:21 Server01 sysmonitor: 01:10:21.725114 ERROR [perfmanager] transition from [RUNNING] to [UNRESPONSIVE]
01:10:21 Server01 sysmonitor: 01:10:21.725114 ERROR [perfmanager] transition from [RUNNING] to [UNRESPONSIVE]
01:10:22 Server01 perfmanager: 01:10:22.013484 ERROR Httpcl::Post - Timeout was reached