In order to set up the notification in question, you need to add a Palette item named Request Approval to the PRE or RUN step in your Pipeline Rule, and configure this for the User you would like to approve the Job. You also need to add and configure an event.job.approved Event in Notifications, and make sure this is active. When running a Job, Job Status in the Monitor will appear as Approval; on clicking this link, a dialog will appear. After confirming approval, the User(s) specified in the Event will receive a message notifying them of this.