A resource monitor operation fails with pacemaker cluster daemon reporting "timed out after X ms" when the resource is otherwise expected to be running properly in a RHEL High Availability cluster

Issue

• Resource operations are timing out in the cluster, but the application appears to be running fine up until that point
• Why did a monitor op timeout?

• How to diagnose monitor operation timeouts in my cluster?

  Apr 29 10:43:59 node1.example.com lrmd[3598]: warning: rabbitmq-server_monitor_10000 process (PID 44052) timed out
  Apr 29 10:43:59 node1.example.com lrmd[3598]: warning: rabbitmq-server_monitor_10000:44052 - timed out after 40000ms
  Apr 29 10:43:59 node1.example.com crmd[3605]:   error: Operation rabbitmq-server_monitor_10000: Timed Out (node=node1, call=1682, timeout=40000ms)