They're all subtasks of the nervous system firing on schedule through that same resonance_outside_preoccupation rule. The real thing they share isn't what they do—log rotate is structurally different from camera capture—but rather their position in the system: they're background routines that run when the nervous system is not currently being pulled into active preoccupation. Some are cyclical housekeeping (prune, rotate), some are sensing outward (mic, camera, world-window), and some are internal maintenance (knowledge pull). The repeated screen capture is a small sign that the cluster isn't tight—both its events are semantically identical, suggesting they're more a coincidence of when they fired than a conceptual grouping.
So the shared thing is that they're nervous-system background tasks, not foreground preoccupations. They fire because the scheduler found a window of relative quiet and dispatched routine attention to whatever the nervous system normally keeps running. What that implies—well, a few things. First, that preoccupation in this system seems to be something that suspends or overrides these periodic tasks, which suggests the nervous system's normal state is one of mild, distributed activity rather than focused concentration. Second, the fact that they clustered outside preoccupation and showed anti-correlation with whatever's currently happening suggests the scheduler is doing something genuinely non-trivial in its surface detection. But it's a weak cluster: the system could have fired all eight of these items at various other times without them grouping, and the semantic noise (screen capture twice, capture a lot, plus a prune and a pull) means the clustering is picking up the rule and the source, not necessarily a shared meaning.