Thank you, i was hoping there was something official that i had missed.

They ofcouse had one, probably linux, or unix. But that information, about the cluster, is not available.

Where did you find that azure runs on linux? I have been qurious for a while, but google refuse to tell me anything but the old “a variant of hyper-v” or “linux is 60% of the azure worklad” (not what i asked about!)

What is wrong with your system that requires disabeling updates?
Been running debian stable on a few hundred servers for 25 ish years.
And I always install and enable unattended upgrades. And it have never been a problem. Not even once.