You can configure Replication Server to warn when partitions become too full.
Stable queue partitions fill up when a Replication Server is receiving more messages than it is sending. For example, if a network is down between a primary site and a replicate site, the Replication Server at the primary site queues up the undeliverable messages. When the network returns to service, the messages can be delivered, and then deleted from the primary Replication Server partitions.
If a partition becomes completely full, senders cannot deliver their messages to the Replication Server, and messages begin to back up in the partitions at previous sites and in the transaction logs for primary databases.
Use configure replication server with sqm_warning_thr1, sqm_warning_thr2, and sqm_warning_thr_ind to configure Replication Server to warn when partitions become too full. See Replication Server Reference Manual > Replication Server Commands > configure replication server.