Once the first iteration is implemented, we should document the digest functionality.
- digest functionality is mentioned in docs (do we have docs on processes overview yet?), explained what info to expect (current value and target of KPI reports of given process)
- docs mention which config fields are relevant for email sending (same as for alerts)
- docs explain digest will be sent to owner of process only
- docts explain digest frequency setting
- docs mention digests are "beta" feature subject to changes/improvements