Hi 정석 오 •,
Welcome to Microsoft Q&A forum.
As I understand, your event_scheduler parameter is turned off for Azure MySQL Server.
It looks like you MySQL server has High Availability configured, when failover occurs, it's possible that the event_scheduler
server parameter will be set to 'OFF'. If this occurs, when the failover is complete, configure the parameter to set the value to 'ON'.
Login to your Azure portal > ${your_sql_server} > click on "Server Parameters" tab and you should be able to set all your global parameters like "event_scheduler"
See : Configure server parameters in Azure Database for MySQL - Flexible Server using the Azure portal
Hope this helps.
Let us know if you have more queries.
Thanks