最近在服务器上观察日志出现这么一段诡异的记录，日志的全文摘要如下：

[ Thread-12] c.n.l.PollingServerListUpdater : Shutting down the Executor Pool for PollingServerListUpdater
2020/11/2 下午8:30:52 2020-11-02 20:30:52.912 INFO [core-payment-gateway,,,] 1 --- [extShutdownHook] o.s.s.c.ThreadPoolTaskScheduler : Shutting down ExecutorService 'Nacso-Watch-Task-Scheduler'
2020/11/2 下午8:30:52 2020-11-02 20:30:52.915 INFO [core-payment-gateway,,,] 1 --- [extShutdownHook] c.a.c.n.registry.NacosServiceRegistry : De-registering from Nacos Server now...
2020/11/2 下午8:30:52 2020-11-02 20:30:52.923 INFO [core-payment-gateway,,,] 1 --- [extShutdownHook] c.a.c.n.registry.NacosServiceRegistry : De-registration finished.
2020/11/2 下午8:30:52 2020-11-02 20:30:52.929 INFO [core-payment-gateway,,,] 1 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
2020/11/2 下午8:30:52 2020-11-02 20:30:52.980 INFO [core-payment-gateway,,,] 1 --- [extShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2020/11/2 下午8:30:52 2020-11-02 20:30:52.993 INFO [core-payment-gateway,,,] 1 --- [extShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.

说明

经过多天的观察，服务在关闭的时候就会抛出这个日志，没有别的重要信息。哈哈哈！