I have multiple K8S clusters that have Prometheus-operator Helm chart installed in monitoring namespace. Each operator consists of Prometheus/Alertmanager/Grafana. Aside from it I have Istio Helm chart installed in istio-namespace. I want to integrate the Prometheus/Grafana from Istio into my Prometheus-Operator setup and remove them from istio-namespace and the helm release for Istio. Based on this PR - https://github.com/istio/installer/pull/71 it looks like it's possible, but I can't find exact guidance on how to do it, the end result should be prom-operator prometheus scrapping exactly what it was + what was being scrapped by Istio's Prometheus and then when using the Grafana from prom-operator I should have all mixins + istio dashboards.