A fair enough question but can I suggest that you're less passive about it and speak to them? I've had incidents in my team where there are people I thought we

A fair enough question but can I suggest that you're less passive about it and speak to them? I've had incidents in my team where there are people I thought weren't productive who were genuinely engaged in a million minor support tasks I never knew about. But in any case, talking to them like adults rather than spying on them is the way forward.