Switches are not showing traffic

Switches are not showing traffic

Installed OpManager trial and added 4 of our HP ProCurve switches via the Add Device option in the Inventory section.  Switches added fine; ie OpManager was able to query the switches and get info about them.  I can view the ports and all, but no traffic.  If I click into each switch in OpManager, I can see that Flow Monitoring seems to be off (red circle with an 'x'), and assume this is the issue, but I cannot find where to enable this.  sFlow is enabled on the switches and other software can see/read the traffic, so I'm hoping that I just need to turn this on/configure it somewhere in OpManager, but where?

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