Hi,

I just upgraded our cluster to pacific 16.2.5.
As I'm curious what cephfs-top could give for insights, I followed the
steps in the documentation.
After enabling the mgr module "stats":

# ceph mgr module ls
...
    "enabled_modules": [
        "dashboard",
        "iostat",
        "restful",
        "stats",
        "zabbix"
...

I tried the following command:
# ceph fs perf stats
{"version": 1, "global_counters": ["cap_hit", "read_latency",
"write_latency", "metadata_latency", "dentry_lease", "opened_files",
"pinned_icaps", "opened_inodes"], "counters": [], "client_metadata": {},
"global_metrics": {}, "metrics": {"delayed_ranks": []}}

As you can see, this returns no info whatsoever. The same with:

# cephfs-top
cluster ceph does not exist

The actual cluster name is "ceph".

So I don't understand why "ceph fs perf stats" isn't showing any
information.
Maybe another indicator something isn't ritght:

# ceph fs status
cephfs - 0 clients
======
RANK  STATE      MDS        ACTIVITY     DNS    INOS   DIRS   CAPS
...

I see "0 clients". When I take a look in the mgr dashboard, I can actually
see all clients. Which are RHEL 7 & 8 cephfs kernel clients.
There is only 1 mds active, and 1 in standby-replay.
I have multiple pools active, but only 1 fs.

Does anyone have a suggestion where I can take a look enable gathering the
stats?
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