How to identify this mysqld (initiated by: unknown): Normal shutdown - Source

Revision: 107700
User: Mahfudz Aji
Date: 2021-06-21 12:26

Could you help to elaborate or tell me the reason behind this mysql shutdown? 
Specifically, is there any way to know the program/something which initiate it?
Currently we are using this version
>mysql  Ver 15.1 Distrib 10.3.28-MariaDB, for Linux (x86_64) using readline 5.1

Thank you

<<code>>
May 22 14:49:24 srv43 mysqld: 2021-05-22 14:49:24 0 [Note] /usr/sbin/mysqld (initiated by: unknown): Normal shutdown 
May 22 14:49:24 srv43 mysqld: 2021-05-22 14:49:24 0 [Note] Event Scheduler: Purging the queue. 5 events 
May 22 14:49:24 srv43 mysqld: 2021-05-22 14:49:24 0 [Note] InnoDB: FTS optimize thread exiting. 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Starting shutdown... 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Dumping buffer pool(s) to /var/lib/mysql/ib_buffer_pool 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Instance 0, restricted to 16384 pages due to innodb_buf_pool_dump_pct=25 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Instance 1, restricted to 16384 pages due to innodb_buf_pool_dump_pct=25 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Instance 2, restricted to 16384 pages due to innodb_buf_pool_dump_pct=25 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Instance 3, restricted to 16384 pages due to innodb_buf_pool_dump_pct=25 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Instance 4, restricted to 16384 pages due to innodb_buf_pool_dump_pct=25 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Instance 5, restricted to 16384 pages due to innodb_buf_pool_dump_pct=25 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Instance 6, restricted to 16384 pages due to innodb_buf_pool_dump_pct=25 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Instance 7, restricted to 16384 pages due to innodb_buf_pool_dump_pct=25 
May 22 14:49:26 srv43 mysqld: 2021-05-22 14:49:26 0 [Note] InnoDB: Buffer pool(s) dump completed at 210522 14:49:26 
May 22 14:49:29 srv43 mysqld: 2021-05-22 14:49:29 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1" 
May 22 14:49:29 srv43 mysqld: 2021-05-22 14:49:29 0 [Note] InnoDB: Shutdown completed; log sequence number 2035532137592; transaction id 3973831863 
May 22 14:49:30 srv43 mysqld: 2021-05-22 14:49:30 0 [Note] /usr/sbin/mysqld: Shutdown complete 
<</code>>

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How to identify this mysqld (initiated by: unknown): Normal shutdown - Source

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