Consider integrating a postmortem review process

[KirilYurovnikRiski]

In order to ensure/improve the quality of our postmortems, consider integrating postmortem reviews in our process, similarly to what is described in PagerDuty's original docs.

https://github.com/KirilYurovnikRiski/postmortem-docs/blob/master/docs/how_to_write/writing.md?plain=1#L229

[KirilYurovnikRiski]

Proposal from Production forum May 25th, 2022:

• Such a review process needs to be owned by the Production forum.
• We can have a monthly postmortem review meeting to go over recent postmortems, and refer to the following points:
  • Was the postmortem completed in a timely manner (within a week from the incident)?
  • Was the description & timeline complete and clear? Can we fully understand what happened from the postmortem summary?
  • Root cause analysis quality - did the postmortem uncover the actual root cause(s)? Do we need to ask the postmortem owner to follow up with a deeper analysis?
  • Action items:
  • Are there action items?
  • Are the action items clear and well-defined?
  • Is there an assigned owner for each action item?
  • Is there a Jira ticket for each action item (with a postmortem-action-item label)?