Question to those that use GCP/AWS and cert-manager....why not use a managed certificates service that both now offer? I found cert-manager to be the biggest pain point in my cluster (albeit this was 18 months ago)
I've added some information on why we made the choices we did in the Discussion section. Briefly, the GCP managed certs are only available with the native GKE load balancer solution. For costs reasons, we use nginx-ingress rather than the native solution.