Notes on jobs are information that DBA’s and the Control Center system save to better document a system setup and known behaviour.
When you open notes on a job, it will start off as a blank note. The top field is for personal notes and the contents are stored in an encrypted format. The dialog is split into user and system dialogue.
You can add notes in the notepad window, it can be information you want to store on how issues this job detected in the past were fixed. In the case of an agent jobs check, steps taken to fix the issue, or how the job was re-run.
The user dialog is the communication from a DBA to other DBA’s regarding this job. It is public notes, visible to others. The system dialog is log entries that will highlight changes to this job and its schedule done by other users, such as disabling the job.
The dialog part of the job notes is also visible in the notes overview for the database instance, as part of instance details. Also the instance notes are visible in this view. And Control Center creates notes when database instances loose connection.