Re: "ceph fs perf stats" and "cephfs-top" don't work

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If I run the commands now, I still don't get any information returned with
ceph fs perf stats.
cephfs-top still says there is no cluster ceph.

The clients are all el7 & el8 kernel clients and show up in the Dashboard.

When I execute "ceph tell mds.<rank0 id> client ls", I can see all clients
are there. For example:

[
    {
        "id": 2916622,
        "entity": {
            "name": {
                "type": "client",
                "num": 2916622
            },
            "addr": {
                "type": "v1",
                "addr": "10.0.1.24:0",
                "nonce": 3286427868
            }
        },
        "state": "open",
        "num_leases": 0,
        "num_caps": 1,
        "request_load_avg": 0,
        "uptime": 44154.571553857997,
        "requests_in_flight": 0,
        "num_completed_requests": 0,
        "num_completed_flushes": 0,
        "reconnecting": false,
        "recall_caps": {
            "value": 0,
            "halflife": 60
        },
        "release_caps": {
            "value": 0,
            "halflife": 60
        },
        "recall_caps_throttle": {
            "value": 0,
            "halflife": 1.5
        },
        "recall_caps_throttle2o": {
            "value": 0,
            "halflife": 0.5
        },
        "session_cache_liveness": {
            "value": 0,
            "halflife": 300
        },
        "cap_acquisition": {
            "value": 0,
            "halflife": 10
        },
        "delegated_inos": [],
        "inst": "client.2916622 v1:10.0.1.24:0/3286427868",
        "completed_requests": [],
        "prealloc_inos": [],
        "client_metadata": {
            "client_features": {
                "feature_bits": "0x0000000000007bff"
            },
            "metric_spec": {
                "metric_flags": {
                    "feature_bits": "0x000000000000001f"
                }
            },
            "entity_id": "xxx",
            "hostname": "xxx.xxx.xx",
            "kernel_version": "4.18.0-305.7.1.el8_4.x86_64",
            "root": "/nodes/xxx/xxx"
        }
    },

So where Eugen gets "some" information back, I don't get any.
It looks as if the cluster isn't recognized, even while all other commands
are working.
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