Replication Server 15.5 introduces a system command to identify performance issues in data replication.
sysadmin issue_ticket injects an rs_ticket marker into the inbound queue, bypassing the need for the RepAgent on the primary database to process the ticket. rs_ticket processes from this point by appending the system time at the end of the marker as it passes through certain modules on the Replication Server. The information gathered by this marker is stored in the rs_ticket_history table in the replicated database.
See Chapter 3, “Replication Server Commands” in the Replication Server Reference Manual.