Ceph-mgr Python error with prometheus plugin

[Ansgar Jazdzewski <a.jazdzewski@xxxxxxxxxxxxxx>]

Hi Folks,

i just try to get the prometheus plugin up and runing but as soon as i
browse /metrics i got:

500 Internal Server Error
The server encountered an unexpected condition which prevented it from
fulfilling the request.

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/cherrypy/_cprequest.py", line
670, in respond
    response.body = self.handler()
  File "/usr/lib/python2.7/dist-packages/cherrypy/lib/encoding.py",
line 217, in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/cherrypy/_cpdispatch.py",
line 61, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/usr/lib/ceph/mgr/prometheus/module.py", line 386, in metrics
    metrics = global_instance().collect()
  File "/usr/lib/ceph/mgr/prometheus/module.py", line 323, in collect
    self.get_metadata_and_osd_status()
  File "/usr/lib/ceph/mgr/prometheus/module.py", line 283, in
get_metadata_and_osd_status
    dev_class['class'],
KeyError: 'class'

I assume that i have to change the mkgr cephx kex? but iam not 100% sure

mgr.mgr01
       key: AQAqLIRasocnChAAbOIEMKVEWWHCbgVeEctwng==
       caps: [mds] allow *
       caps: [mon] allow profile mgr
       caps: [osd] allow *

thanks for your help,
Ansgar
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