Master Key rotation

[veochen-octopus]

Add docs and instructions for

• rotate-master-key
• set-master-key

[veochen-octopus]

Thanks @harrisonmeister. I've applied all of your excellent suggestions. Included a snippet of a report from a dev run to show the high level summary. Let me know if this is ok.

[veochen-octopus]

Thanks @harrisonmeister. Some weird formatting on my part. Good catch on all of them 👍.

Intending to merge when 2022.4 goes GA.

[johnsimons]

@veochen-octopus @zentron, on average, how long does this process take? Let's say a large customer instance.

[veochen-octopus]

on average, how long does this process take? Let's say a large customer instance.

@johnsimons We didn't benchmark this too much. Obviously many factors that could affect the time. But I did make sure that it's not unacceptable, by rotating ~100,000 variables on my machine, and restricting the db to 4G of ram and 2 cores. It would take ~10min. Hope that at least gives an idea.