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When opening the grafana performance details tab for any host on the page "Hosts", the displays for the "Disk IOPS" and the "Throughput by Disk" are emtpy. When clicking on the red exclamation mark in the upper left corner of one of the displays, a JSON error is displayed.
Here is an example of the error message:

error:Object

message:""found duplicate series for the match group {device="dm-3", instance="ceph_cluster"} on the right hand-side of the operation: 
[
{__name__="ceph_disk_occupation", ceph_daemon="osd.62", device="dm-3", exported_instance="iz-ceph-01-osd-04", instance="ceph_cluster", job="ceph"},  
{__name__="ceph_disk_occupation", ceph_daemon="osd.100", device="dm-3", exported_instance="iz-ceph-01-osd-01", instance="ceph_cluster", job="ceph"}
];
many-to-many matching not allowed: matching labels must be unique on one side"" 

refId:"B" 

status:422

statusText:"Unprocessable Entity" 

The system used is Ceph 15.2.7 on Ubuntu 20.04.2