Add memory swap in and out metric

Registered by Shaoman Zhang

In order to monitor the VM's memory usage information, increase the memory swap-in and swap-out meter.
Like memory.usage, this metric requires the virtio balloon driver installed in VM.

Blueprint information

Status:
Complete
Approver:
gordon chung
Priority:
Undefined
Drafter:
Shaoman Zhang
Direction:
Approved
Assignee:
Shaoman Zhang
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Shaoman Zhang
Completed by
Shaoman Zhang

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