Some sensors may combined and represented as set (array), for example: 5 HDD's S.M.A.R.T., 16 CPU's core temperature, 4 ethernet interfaces etc.
They may be getted by single request and return in case:

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Triggers must worked as usually, applied to every member of array. Some additional events(triggers): empty set, members count changes (increased, decreased), empty member.
mayby combined graph drawed