ManagedServer Health is Warning（ThreadPool has stuck threads）

Dump Thread stacks：

"WG-Collector-1" waiting for lock java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@27a35546 WAITING
  
  sun.misc.Unsafe.park(Native Method)
  
  java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
  
  java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
  
  java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1085)
  
  java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807)
  
  java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068)
  
  java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
  
  java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
  
  java.lang.Thread.run(Thread.java:745)
  
  "WG-Collector-0" waiting for lock java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@27a35546 TIMED_WAITING
  
  sun.misc.Unsafe.park(Native Method)