the dashboard uses absolute links for filesystems and clients
If ceph dashboard is accessed under a subpath (e.g. via kubernetes proxy), then some links are being rewritten correctly, but some are not.
Given ceph dashboard is served from `http://127.0.0.1:8001/api/v1/namespaces/ceph/services/ceph-mgr/proxy/health`,
cluster health points to: http://127.0.0.1:8001/api/v1/namespaces/ceph/services/ceph-mgr/proxy/health
servers points to http://127.0.0.1:8001/api/v1/namespaces/ceph/services/ceph-mgr/proxy/servers
but cephfs filesystem link points to http://127.0.0.1:8001/filesystem/1/ (incorrect absolute link)
within the filesystems page, client details points to http://127.0.0.1:8001/clients/1/ (incorrect absolute link)