Distinguish between unsupported meters and data loss

Registered by Shaoman Zhang

Now we can't distinguish between unsupported meters and data loss, for example, memory.usage relies on virtio balloon driver. If the vm does not install the driver, ceilometer can not get data.
But if we can't query the memory.usage, We don't know whether it was unsupported or the data was lost.
So it would be helpful to distinguish between the two situations.

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Priority:
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Drafter:
Shaoman Zhang
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Needs approval
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Definition:
New
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Unknown
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