Daily Digest Email Notifications
Problem to solve
A daily digest email option for those users who wish to receive certain channels of notifications via email, but not as they happen in the form of ad-hoc emails as is the case today.
Further details
A user wishes to receive email notifications about events of interest to them / involving them, but don't wish to see emails throughout the day which they may discard because of information overload, or else it interrupts their workflow. Various software packages offer a 'daily digest' email, whereby instead of notifications that would fire in response to certain actions, the information is aggregated into a daily digest, presenting the data as a summary, but capturing all pertinent information and providing links to the user to associated issues / MRs etc.
Proposal
To implement a daily digest feature for notifications, a user preference, and an email template as appropriate. This would aggregate notifications that would have fired throughout the day, multiple comments on issues / MRs aggregated to a single issue / MR update summary for instance. Some level of persistence for this activity may be required but I don't know to what extent this is happening already if at all, and whether the use case outlined here might already be supported by the captured data available today. Currently the only similar issue I can see is gitlab-ce#49859, but this proposal would extend to all such notifications within gitlab. Appreciate this is at best vague at the moment, but I will endeavour to come back to this with a more concrete list of features. Just wanted to start a discussion going really.