I've set up two items against my Zabbix Server to capture the state of the Zabbix queue:
zabbix[queue,60]
zabbix[queue,1s]

I would expect the first to give me a count of any items in the queue that are delayed for more than one minute, and the second more than one second.

Currently I can see two items that have been in the queue for more than 10 minutes, and both of these items are returning a value of 0.

In fact, I've been running the "zabbix[queue,60]" item for over 10 days now and it still hasn't recorded a number other than 0 despite items regularly queueing. (And the queue item runs every 60 seconds).

The "zabbix[queue,1s]" has recorded a value of 1 for two consecutive checks (so 2 minutes) since I started it an hour ago, whereas in that time two items have been queueing for over 20 minutes (see attached screenshot).

Are any items excluded from this count, or should it return the entire size of the queue?