etcd only is useful for Kubernetes models, and mysql only is useful for OpenStack models. OpenStack deployment assumes MAAS provider by nature so it has less resource limitation since etcd can be deployed as LXD containers. So from a resource allocation point of view, etcd only backend has some priority IMHO. Anyway, the mysql one is tracked as: https://bugs.launchpad.net/vault-charm/+bug/1835356
> How about mysql only instead of etcd only?
etcd only is useful for Kubernetes models, and mysql only is useful for OpenStack models. OpenStack deployment assumes MAAS provider by nature so it has less resource limitation since etcd can be deployed as LXD containers. So from a resource allocation point of view, etcd only backend has some priority IMHO. Anyway, the mysql one is tracked as: /bugs.launchpad .net/vault- charm/+ bug/1835356
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