What about when the current depth is not increasing?

If the current depth of your queue is not increasing, it might still be useful to monitor the queue to check whether your application is processing messages correctly. to do this, issue the following command periodically to gather performance data about the queue:

DISPLAY QSTATUS(Q1) TYPE(QUEUE) MSGAGE QTIME

In the output, if the value in MSGAGE increases over the period of time, and your application is designed to process all messages, this might indicate that some messages are not being processed at all.