This is a couple of years ago, so I fully expect most of the issues we had back then to be fixed by now, but it was definitely Azure that was the problem.

We wanted to use their hosted kubernetes solution(I forget the name) and pods would just randomly lose connection to eachother, everything network related was just ridiculously unstable. Host machines would report their status as healthy, but then be unable to start any pods, making scaling out the cluster unreliable. I also remember a colleague I regarded as a bit of a wizard being very frustrated with cosmosdb, but I cannot for the life of me remember what the specific issue was.

Our solution was actually quite well written, if I do say so myself, we had designed it to be cloud agnostic, just on the off chance that something like this would happen (there may have been rumours this acquisition would happen ahead of time).

But Azure was just utterly unable to deliver on anything they promised, thus the write-off on my part.