Hikari CP线程转储中废弃的连接清理线程

Question

我在应用程序中使用的是HikariCP版本3.3.1，但没有收到leakdetectionThreshold错误。通过保持连接打开状态进行检查，并将阈值设置为最小可能值2000。

现在，我进行了一个线程转储，它就是这样的：

"MySQLConnectionPool housekeeper" #136 daemon prio=5 os_prio=31 tid=0x00007fd489342800 nid=0xe303 waiting on condition [0x000070000a9a0000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x000000074049fe60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

"Abandoned connection cleanup thread" #135 daemon prio=5 os_prio=31 tid=0x00007fd488b42800 nid=0x11603 in Object.wait() [0x000070000a89d000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
    - locked <0x0000000740bc4f38> (a java.lang.ref.ReferenceQueue$Lock)
    at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:70)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)`

这到底是什么，这是我没有得到LeakDetectionThreshold和hikariCP调试日志记录的原因吗？