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Hi Vitrages,

I deploy the Vitrage OS env with the latest code using devstack.
And I config the Nagios and start my_site.
I used the config two months ago, it works.
But this time, it can not get the nagio datasource.

In the function `prepare_service`, i add some log to print 
`conf.datasources.types` as follows:
It seems that the oslo_config can't get the Nagios opts.
I checked all the Nagios config and didn't find the error.
Is there any change about the config? 

2016-09-05 14:48:55.680 1288 INFO vitrage.service [-] 
-------------dwj---------prepare_service: nova.host
2016-09-05 14:48:55.680 1288 INFO vitrage.service [-] 
-------------dwj---------prepare_service: nova.instance
2016-09-05 14:48:55.681 1288 INFO vitrage.service [-] 
-------------dwj---------prepare_service: nova.zone
2016-09-05 14:48:55.681 1288 INFO vitrage.service [-] 
-------------dwj---------prepare_service: static_physical
2016-09-05 14:48:55.682 1288 INFO vitrage.service [-] 
-------------dwj---------prepare_service: aodh
2016-09-05 14:48:55.682 1288 INFO vitrage.service [-] 
-------------dwj---------prepare_service: cinder.volume
2016-09-05 14:48:55.683 1288 INFO vitrage.service [-] 
-------------dwj---------prepare_service: neutron.network
2016-09-05 14:48:55.683 1288 INFO vitrage.service [-] 
-------------dwj---------prepare_service: neutron.port

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