Seen in a CI env:

2024-07-29  5:36:35 38 [Warning] Aborted connection 38 to db: 'unconnected' user: 'root' host: 'localhost' (Got an error reading communication packets)
2024-07-29  5:36:37 39 [Warning] Aborted connection 39 to db: 'unconnected' user: 'unauthenticated' host: 'localhost' (This connection closed normally without authentication)
2024-07-29  5:36:39 0 [Note] /usr/libexec/mysqld (initiated by: unknown): Normal shutdown

This seems to be a failure to connect to the server from the mysql cli.

Consequently, the liveness probe script ends in error, and k8s restarts the pod where the probe error occurred.
This is likely an unecessary reboot and should be avoided if possible