test plan:
* perform an action that generates a delayed message, like grading an
assignment
* change the grade on the assignment to generate another message
* wait 30 minutes, and very you only got the second message
Change-Id: I7aeccfb9db705ed3403e8927776a039403cabf27
Reviewed-on: https://gerrit.instructure.com/8944
Reviewed-by: Zach Wily <zach@instructure.com>
Tested-by: Hudson <hudson@instructure.com>
If any individual message delivery fails, we'll reschedule it as its own
individual job.
Change-Id: I51ae5941fd001c61e6c6b708185ff12585d0a49f
Reviewed-on: https://gerrit.instructure.com/2390
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Bracken Mosbacker <bracken@instructure.com>
Brian Palmer