After completing the FFU from 16.2 to 17.1 + CEPH 7, no performance metrics data was displyaed for individual RBD images in the CEPH Dashboard
This residual is connected to a wrong query implemented by the Ceph dashboard when the individual entities are queried

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It seems that in the generated url for volumes performance (if we query a single volume) there are some variable uppercase characters that are preventing metrics to be displayed:
This is the generated url:
http://ceph.lab-1.sddc.bankit.it:3100/d/YhCYGcuZz/rbd-details?**var-Pool**=volumes&**var-Image**=volume-07cbeb7d-d194-4edf-91de-a2ffc7c048df&refresh=5s&var-datasource=Dashboard1&kiosk&from=now-1h&to=now&orgId=1

Changing in
http://ceph.lab-1.sddc.bankit.it:3100/d/YhCYGcuZz/rbd-details?**var-pool**=volumes&**var-image**=volume-07cbeb7d-d194-4edf-91de-a2ffc7c048df&refresh=5s&var-datasource=Dashboard1&kiosk&from=now-1h&to=now&orgId=1

works correctly.
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