You can craft one or multiple solar Goals as detailed here:
I suspect that Sense is considering an automatic alert for such situations because it’s one of those emphatic events that lends itself to some additional smarts. Thinking out loud:
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Correlate solar output with local sunshine and time of day; lower than expected output ==> problem ==> alert.
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and/or look at solar history when there is a change in generation not having a cloud movement signature or fitting the likely timing/pattern of shading events.
Not exactly disaggregation of the solar signature so much as using similar logic to the Mains analysis. i.e. Sense Labs > Power Analysis ==> Sense Labs > Solar Analysis.