Context:

Once the first iteration is implemented, we should document the digest functionality.

AT:

• 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