A guideline for postmortem communication

Building on previous posts, the following is a proposed Guideline for Postmortem Communication:

Prerequisites:

1. Admit failure - Hiding downtime is no longer an option
2. Sound like a human - Do not use a standard template, do not apologize for "inconveniencing" us
3. Have a communication channel - Set up a process to handle incidents prior the event (e.g. public health dashboard, status blog, twitter account, etc.)
4. Above all else, be authentic - You must be believed to be heard

Requirements:

1. Start time and end time of the incident
2. Who/what was impacted - Should I be worried about this incident?
3. What went wrong - What broke and how you fixed it (with insight into the root cause analysis process)
4. Lessons learned - What's being done to improve the situation for the future, in technology, process, and communication

Bonus:

1. Details on the technologies involved
2. Answers to the Five Why's
3. Human elements - heroic efforts, unfortunate coincidences, effective teamwork, etc
4. What others can learn from this experience