How to use this checklist
The gate before a cluster carries production traffic. It is deliberately an index: each line points at the detailed checklist that proves it. A cluster passes this list only when the underlying lists have been worked, not when someone believes they would pass.
Mark an item N/A when it genuinely does not apply, and write down why. An unexplained N/A is the most common way a checklist stops working.
Sign-off
Every critical item must pass. A failing critical item blocks the deployment or the maintenance window; it is not a note for later. Record the date, the reviewer, and the disposition of every item that did not pass.