This is really silly, but I thought I would mention it so it can be fixed, just so nobody is confused in the future. The file "WEB-INF/mysql-utils/extensions-examples/extensions_queuemetrics.conf" has a small typo in the note that precedes extension 10.
[queuemetrics]
; extension 0 is a dummy end point
exten => 10,1,Answer
I presume it should read "; extension 10 is a dummy end point"?
No big deal, but thought I'd point it out.
Tom