document prometheus-server persistent storage
in https://gitlab.com/charts/gitlab/blob/master/doc/installation/storage.md
--set prometheus.server.persistentVolume.storageClass=...
And possibly other components like redis-ha (?)
in https://gitlab.com/charts/gitlab/blob/master/doc/installation/storage.md
--set prometheus.server.persistentVolume.storageClass=...
And possibly other components like redis-ha (?)