No metrics shown in dashboard (18.2.1)

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Hi,
I just freshly deployed a new cluster (v18.2.1) using cephadm. Now before creating pools, cephfs and so on I wanted to check if the dashboard is working and if I get some metrics.
If I navigate to Cluster >> Hosts and open one of the OSD hosts the "Performance Details" tab is shown but all graphs display "no data". "OSDs" and "Raw Capacity" in that tab display "N/A". 

Prometheus is running:

[root@cephmon-01 ~]# ceph orch ps --service_name prometheus
NAME HOST PORTS STATUS REFRESHED AGE MEM USE MEM LIM VERSION IMAGE ID CONTAINER ID prometheus.cephmon-01 cephmon-01 *:9095 running (54m) 9m ago 3d 51.4M - 2.43.0 a07b618ecd1d 11b4b19df0d6 

However it has no data collected:
[root@cephmon-01 ~]# curl -s -XGET http://127.0.0.1:9095/api/v1/targets/metadata 
{"status":"success","data":[]}

ceph-exporter services also seem to be running:

[root@cephmon-01 ~]# ceph orch ps --service_name ceph-exporter
NAME HOST PORTS STATUS REFRESHED AGE MEM USE MEM LIM VERSION IMAGE ID CONTAINER ID ceph-exporter.cephmon-01 cephmon-01 running (46h) 10m ago 3d 16.7M - 18.2.1 d2cdd87030d1 191eedccbcd8 ceph-exporter.cephmon-02 cephmon-02 running (3d) 2m ago 3d 16.5M - 18.2.1 d2cdd87030d1 7a08e9f1401c ceph-exporter.cephmon-03 cephmon-03 running (3d) 6m ago 3d 16.5M - 18.2.1 d2cdd87030d1 1eb4856a60d4 ceph-exporter.cephosd-01 cephosd-01 running (2d) 10m ago 2d 19.9M - 18.2.1 d2cdd87030d1 05642098f7de ceph-exporter.cephosd-02 cephosd-02 running (2d) 10m ago 2d 19.9M - 18.2.1 d2cdd87030d1 648715ecaa9d ceph-exporter.cephosd-03 cephosd-03 running (2d) 10m ago 2d 19.4M - 18.2.1 d2cdd87030d1 b8bb6dcb5386 ceph-exporter.cephosd-04 cephosd-04 running (2d) 10m ago 2d 19.5M - 18.2.1 d2cdd87030d1 4f1964f79ffe ceph-exporter.cephosd-05 cephosd-05 running (2d) 10m ago 2d 19.8M - 18.2.1 d2cdd87030d1 8ca8cbbf3984 ceph-exporter.cephosd-06 cephosd-06 running (2d) 10m ago 2d 19.4M - 18.2.1 d2cdd87030d1 a5e2860cc98e ceph-exporter.cephosd-07 cephosd-07 running (2d) 3m ago 2d 19.8M - 18.2.1 d2cdd87030d1 4eb01b8ebd33 ceph-exporter.cephosd-08 cephosd-08 running (2d) 3m ago 2d 19.9M - 18.2.1 d2cdd87030d1 b934866d2a1d ceph-exporter.cephosd-10 cephosd-10 running (2d) 3m ago 2d 19.4M - 18.2.1 d2cdd87030d1 457368d07579 ceph-exporter.cephosd-11 cephosd-11 running (2d) 3m ago 2d 19.5M - 18.2.1 d2cdd87030d1 e561cfac4209 ceph-exporter.cephosd-12 cephosd-12 running (2d) 9m ago 2d 19.9M - 18.2.1 d2cdd87030d1 0e5773c8e038 

as well as node-exporter services:

[root@cephmon-01 ~]# ceph orch ps --service_name node-exporter
NAME HOST PORTS STATUS REFRESHED AGE MEM USE MEM LIM VERSION IMAGE ID CONTAINER ID node-exporter.cephmon-01 cephmon-01 *:9100 running (46h) 19s ago 3d 11.3M - 1.5.0 0da6a335fe13 72fefb7966ff node-exporter.cephmon-02 cephmon-02 *:9100 running (3d) 3m ago 3d 13.5M - 1.5.0 0da6a335fe13 2041d3d385b0 node-exporter.cephmon-03 cephmon-03 *:9100 running (3d) 7m ago 3d 12.9M - 1.5.0 0da6a335fe13 6ef204d12a7d node-exporter.cephosd-01 cephosd-01 *:9100 running (2d) 18s ago 2d 13.0M - 1.5.0 0da6a335fe13 6b05483b05c6 node-exporter.cephosd-02 cephosd-02 *:9100 running (2d) 18s ago 2d 11.4M - 1.5.0 0da6a335fe13 ede4995ffb1d node-exporter.cephosd-03 cephosd-03 *:9100 running (2d) 18s ago 2d 11.5M - 1.5.0 0da6a335fe13 cfbf15168667 node-exporter.cephosd-04 cephosd-04 *:9100 running (2d) 18s ago 2d 13.2M - 1.5.0 0da6a335fe13 5dc4794a7f6e node-exporter.cephosd-05 cephosd-05 *:9100 running (2d) 18s ago 2d 13.4M - 1.5.0 0da6a335fe13 8dfa1e252f82 node-exporter.cephosd-06 cephosd-06 *:9100 running (2d) 18s ago 2d 13.5M - 1.5.0 0da6a335fe13 93467e37df08 node-exporter.cephosd-07 cephosd-07 *:9100 running (2d) 4m ago 2d 13.2M - 1.5.0 0da6a335fe13 11795b83732d node-exporter.cephosd-08 cephosd-08 *:9100 running (2d) 4m ago 2d 13.5M - 1.5.0 0da6a335fe13 04197f3a6eb1 node-exporter.cephosd-10 cephosd-10 *:9100 running (2d) 4m ago 2d 13.2M - 1.5.0 0da6a335fe13 9e904581442c node-exporter.cephosd-11 cephosd-11 *:9100 running (2d) 4m ago 2d 13.0M - 1.5.0 0da6a335fe13 5164113044ed node-exporter.cephosd-12 cephosd-12 *:9100 running (2d) 16s ago 2d 13.3M - 1.5.0 0da6a335fe13 5c8af368eed4 

I'm a bit lost, how can I get this running?

Thanks for any help
   Dietmar

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