I've been adding a few QoE sensors since the NPM v11 release, but it's been a bit hit and miss so far.
Adding server agents has been painless, but they seem to connect to the NPM server only when they feel like it. The agents will all have a Connection Status of 'Connected' and Agent Status of 'Agent is running', but when I look at the main Manage QoE Agent Packet Sensors, some show Up, others show Down.
Now, having just completed the NPM upgrade to 11.0.1 and IPAM to 4.2, all sensors are showing 'Down', but the status is 'Connected' and 'Agent running'. Doesn't make much sense to me. I've tried re-starting all the agents, but it hasn't make any difference.