Custom Jobs are scheduled tasks that the system runs at predefined times or intervals. However these are not the default scheduled events of WordPress. Therefore if needed, you can delete them by clicking on delete option located under Name of the Hook column.
This page consists of screenshots from the Custom Cron Jobs Screen in Clean Up Booster WordPress Plugin.
This page displays details such as List of the Scheduled events, Individual Schedule Interval, Date & Time for next event Execution and Arguments to pass to the hook function(s) for WP scheduled events.
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