We've been using the [celery_statsd](https://github.com/lyst/celery-statsd) for
additional Celery monitoring but have recently noticed issues with the config
passing, i.e.,
```
>>> from celery import Celery
>>>
>>>
>>> class Config:
... STATSD_HOST = 'localhost'
...
>>> app = Celery(source_config=Config)
>>> app.conf.STATSD_HOST
Traceback (most recent call last):
File ".../celery/utils/collections.py", line 130, in __getattr__
return self[k]
File ".../celery/utils/collections.py", line 436, in __getitem__
return self.__missing__(key)
File ".../celery/utils/collections.py", line 269, in __missing__
raise KeyError(key)
KeyError: 'STATSD_HOST'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File ".../celery/utils/collections.py", line 134, in __getattr__
type(self).__name__, k))
AttributeError: 'Settings' object has no attribute 'STATSD_HOST'
```
According to the
[documentation](http://docs.celeryproject.org/en/latest/userguide/application.html#config-from-object)
it seems like the `config_from_object` is the suggested approach, which
provides the correct behavior,
```
>>> app = Celery()
>>> app.config_from_object(Config)
>>> app.conf.STATSD_HOST
'localhost'
>>>
```
to: @graceguo-supercat @kristw @michellethomas @mistercrunch @timifasubaa
[ Full content available at:
https://github.com/apache/incubator-superset/pull/5726 ]
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