Julien Danjou b62fa85400 Limit the default numbers of metrics polled
Enabling everything to be polled and transformed by default is quite heavy and
can lead to a massive amount of unused metrics. Limit the default to a few
metrics known to be actually useful to common deployers.

We keep all pollsters enabled on unit tests and devstack.

Change-Id: Ifb5aa684e575b7904726276b7205824f2dcaa7ce
2017-07-11 17:35:23 +02:00
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