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I would suggest to go ahead and install ceilometer.

Then use the ceilometer command line tool to fetch the metrics.

Example: "ceilometer sample-list --query resource=e335e2fd-16bd-4f6d-a194-9cef6c1dcffa --meter=cpu_util"

The above command will fetch you the cpu_usage for the instance with id "e335e2fd-16bd-4f6d-a194-9cef6c1dcffa". Similarly you can query other system related metrics for different resources.

Alternatively, one can also use some monitoring tools such as grafana or kibana. In case of grafana, which i have little experience , there needs to be a telegraf agent running on the compute nodes as well as the VMs.