A list of all jobs should be displayed. Jobs are either timers or async messages (an icon to indicate that would be nice).
A sys admin should be able to
View list of job failures
Retry failed jobs
Jobs can have exceptions. The exception property contain the stacktrace.
Jobs with property retries == 0 are to be considered as in a DLQ. Those should have an action enabled to retry the job. It would be great if the system allowed for easy selection of multiple jobs for retry. That might happen e.g. if a mail server is temporary down.