Comment 3 for bug 1869797

In the OpenStack charms, this is a result of the following code: https://github.com/openstack/charms.openstack/blob/94d446433b415a31afba8c540e55772877476930/charms_openstack/adapters.py#L186

As Junien says, the memcached charm doesn't do any sort of HA by default, but this can be configured via a charm option: repcached