Runbooks, incident reports, postmortems, change requests and on-call handovers.
Operational Runbook
What to do when the alert fires, written for someone half asleep who did not build the system.
Incident Report
The factual record of an outage: timeline, impact, actions — written during and immediately after, not weeks later.
Postmortem
Blameless analysis of why an incident was possible, and what change would prevent the class of it.
Change Request
The approval record for a production change: what, when, risk, backout, and who said yes.
On-call Handover
Live context passed between shifts, so the next engineer does not start from zero.