add cinder runbook

[eviljeff]

Fixes mozilla/addons#15639

Description

Adds a runbook for Cinder.

Context

I also tinkered with the runbooks in general - despite the instructions, defining the steps with ## Steps and then the steps at level 3 means the TOC doesn't show the step names.

After writing this file, I'm not sure if it should live in runbooks or elsewhere - it's part explainer, part runbook? Suggestions welcome. About the structure/content too.

Testing

Checklist

• Add #ISSUENUM at the top of your PR to an existing open issue in the mozilla/addons repository.
• Successfully verified the change locally.
• The change is covered by automated tests, or otherwise indicated why doing so is unnecessary/impossible.
• Add before and after screenshots (Only for changes that impact the UI).
• Add or update relevant docs reflecting the changes made.

[eviljeff]

Christina has been allocated the review - along with the general r? I'd be interested to know if this explains Cinder to you, as someone who was not already familiar with it.

Mat - I'm interested, does this "fit" with our existing docs, is it written as a runbook, should it be somewhere else in the docs, (should it be split up?) etc.

[diox]

Mat - I'm interested, does this "fit" with our existing docs, is it written as a runbook, should it be somewhere else in the docs, (should it be split up?) etc.

It's a weird one - what you have here is fine IMHO, what I would maybe do is make it clear this is more engineer-focused with a sentence towards the beginning stating that fact. We're not trying to document how moderators/operations should use it, just how we use it in AMO engineering land to set up scenarios etc.

[chrstinalin]

I'd be interested to know if this explains Cinder to you, as someone who was not already familiar with it.
Seems a pretty good explanation to me

[chrstinalin]

Probably not be necessary given I imagine anyone touching this would be familiar with it already, but it might be nice to link to the waffle switch section here

[eviljeff]

47b640a