I have installed kubernetes monitoring stack using this https://marketplace.digitalocean.com/apps/kubernetes-monitoring-stack, and works fine, but I want to know where is the storage location of prometheus data?

According to this tutorial https://www.digitalocean.com/community/tutorials/how-to-set-up-digitalocean-kubernetes-cluster-monitoring-with-helm-and-prometheus-operator I can specified prometheus storage to use block storage,

I’m just afraid if the data stored in my k8s cluster it will get bloated