Message "U2000015 Periodical job test" appears in the Agent log
The 'U2000015 Periodical job test started.' checks to see if a job started through Automic is still running. It wil appear as long as a job is running on the Agent. Once the job reports back completed, it will stop checking. If it doesn't get a message back when it pings the job, it will cause the job to go into a ENDED_LOST status.
No action needs to be taken