Holding a postmortem meeting
A postmortem meeting is the follow-up to the document. It often finalizes action items, discusses the findings of the root cause, and offers a safe setting for discussion. Usually, the best set of people to invite to a postmortem meeting are those involved in the incident—the tech lead for services affected, the product manager for the affected services, and any interested engineers. Finding the right balance is hard, because if the meeting is too large, you will not get much done, but if the meeting is too small, knowledge won't be disseminated well.
It's a good idea to have those involved in the incident present because they will know what happened in case data is missing from the document. Tech leads from affected services should be there in case assumptions are made about their services that aren't true and to accept responsibility to make sure that the action items get implemented. Product managers for affected services are important...