<p class="separator" style="text-align: left; clear: both;">Just as the image shows.</p><p class="separator" style="text-align: left; clear: both;">I have some consumers to consume a queue. All of them are set "Ack required" in programming code.</p><p class="separator" style="text-align: left; clear: both;">I can only see deliver rates, but not ack rates.</p><p class="separator" style="text-align: left; clear: both;">This problem doesn't happen in other queue, other same code consumer. Only here.</p><p class="separator" style="text-align: left; clear: both;"><a imageanchor="1" href="https://lh3.googleusercontent.com/-xg92T1aWPek/UUlxygYfi3I/AAAAAAAAMs8/h9cjMvYrQ4w/s1600/%E9%80%89%E5%8C%BA_020.png" style="margin-left: 1em; margin-right: 1em;"><img style="" src="https://lh3.googleusercontent.com/-xg92T1aWPek/UUlxygYfi3I/AAAAAAAAMs8/h9cjMvYrQ4w/s1600/%E9%80%89%E5%8C%BA_020.png" border="0"></a></p><div style="text-align: center;"><br></div>