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By default, Ceilometer uses polling.yaml as cfg_file [1][2] that defines the limit default numbers of metrics polled. Users may want to define their own polled metrics. [1] https://github.com/openstack/ceilometer/blob/master/ceilometer/polling/manager.py#L54 [2] https://github.com/openstack/ceilometer/blob/master/etc/ceilometer/polling.yaml Change-Id: Iadd627ca3c767453e71c8a0c2044f00f30055f16