Eventlog files are not being written

The eventlog API endpoint is behaving appropriately (which is why we haven't noticed this until now, but on Box's deployment it looks like the last eventlog_master.log or eventlog_slave.log files to be written were on June 4.

Start by tracing the eventlog API endpoint and the code responsible for writing eventlog_master.log and eventlog_slave.log. Compare its behavior with the Box deployment, then verify that both files are written again while the endpoint continues to behave appropriately.

Written by the indexing model from the issue text.