nova/releasenotes/notes/bp-memory-bw-4ceb971cfe1a2f...

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---
upgrade:
- The get_metrics API has been replaced by
populate_metrics in nova.compute.monitors.base
module. This change is introduced to allow each
monitor plugin to have the flexibility of setting
it's own metric value types. The in-tree metrics
plugins are modified as a part of this change.
However, the out-of-tree plugins would have to
adapt to the new API in order to work with nova.