CLC-4057 Perform health check on background job processing

https://jira.ets.berkeley.edu/jira/browse/CLC-4057

I'm concerned that the LATE functionality is overly alarmist. If a certain number of LATEs are expected, is that going to keep Ops in a constant tizzy investigating to see why? Is there any reason to worry about LATEs? If so, they should be errors. If not, they should probably be rolled up as status "OK".