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The deprecated feature cluster name is documented and almost recommended at [[https://docs.ceph.com/en/latest/install/manual-deployment/]]:

Cluster Name: Ceph clusters have a cluster name, which is a simple string without spaces. The default cluster name is ceph, but you may specify a different cluster name. Overriding the default cluster name is especially useful when you are working with multiple clusters and you need to clearly understand which cluster your are working with.

or at [[https://docs.ceph.com/en/latest/rados/configuration/ceph-conf/]]:

$cluster
Expands to the Ceph Storage Cluster name. Useful when running multiple Ceph Storage Clusters on the same hardware.

Example
/etc/ceph/$cluster.keyring

Default
ceph

Every were in the documentation, the reference to the variable $cluster should be removed.

again:

On startup, Ceph processes search for a configuration file in the following locations:

$CEPH_CONF (i.e., the path following the $CEPH_CONF environment variable)
-c path/path (i.e., the -c command line argument)
/etc/ceph/$cluster.conf
~/.ceph/$cluster.conf
./$cluster.conf (i.e., in the current working directory)
On FreeBSD systems only, /usr/local/etc/ceph/$cluster.conf
where $cluster is the cluster’s name (default ceph).

It's described at [[https://docs.ceph.com/en/latest/rados/configuration/common/#running-multiple-clusters-deprecated]]. But from a user view point, setting a cluster name is a different feature that running multiple cluster. So the title should be "cluster name", not "RUNNING MULTIPLE CLUSTERS"