1. Do you want these ConflictErrors retried logs to be at level:

INFO

2. In addition, please specify if you feel those retried
ConflictErrors should have their full traceback logged?

no, without traceback

3. Finally, please tell us if the ConflictErrors that *can't* be
retried (and are returned to the user as an error, and are also
logged to the error_log) should be additionally explicitely logged to
the event log, and at which level:

ERROR