Quoting from the documentation:
Before using pools, you need to associate them with an application. Pools that will be used with CephFS, or pools that are automatically created by RADOS Gateway are automatically associated.
For other cases, you can manually associate a free-form application name to a pool:
Note: CephFS uses the application name cephfs, RADOS Block Device uses rbd, and RADOS Gateway uses rgw.
The Ceph Pool list and details view should display this information.