Need confirmation about the timescale / period refresh for QHWM in the MQQPERF command and whether the figure is accurately reported on shared queues.
About the Started Master Tasks, one of the Queue Manager has a shared queue which reports with a curdepth of 408
However, in SYSVIEW and the MQQPERF command its shown with a QHWM value of zero in this case in the other Queue Manager.
SYSVIEW 15.0 & 16.0 - z/OS supported releases -