There are already a million questions and answers stating you cannot run a VPA+HPA at the same time in your cluster performing modifications, for obvious reasons.
However, my question is can you run a VPA in recommend only mode (updateMode: "Off") with an active HPA? Seems like others have had this question but I haven't found a definitive answer to my question. I just want to be really safe before I just start turning things on and have some stuff break.
Others have asked here: https://github.com/kubernetes/autoscaler/issues/3858
Well I just took the plunge and deployed it. So far I'm not having any issues. So it appears to be safe to deploy a VPA+HPA both watching CPU and Memory but have the VPA set with updateMode: "Off".