The spectrumgtw_udm (Subject/l udm_inventory) queue is backing up and not processing all of the messages. There appears to be a delay.
1. Increase the following hub settings in the hub.cfg:
from:
postroute_reply_timeout = 180
hub_request_timeout = 120
to
postroute_reply_timeout = 300
hub_request_timeout = 240
2. Cold start the discovery_server (Deactivate, wait for port and PID to drop and then Activate).
3. Track if the discovery_server is using a lot of memory on the Primary.
4. If you have enough memory available, check the Task Manager/top command to see how much memory is being used, and set the java min/max memory accordingly for the discovery_server, then,
a. Deactivate it.
b. Wait for port and PID to drop.
c. Activate it.
d. Then the spectrumgtw_udm (udm_inventory) queue backup should not occur any longer, e.g.,
<startup>
<opt>
java_opts = -server -XX:ErrorFile=./hs_err_pid.log
java_mem_max = -Xmx5120m
java_mem_init = -Xms3072m
</opt>
</startup>