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You can probably get the information you need by using the std.ssh Mistral action. I don't have experience with this myself but I think you would do something like this.

get_instance_stats:
    task: std.ssh
    input:
        cmd: free -m
        host: instance-hostname
        # ...

You can see more about this task in the docs here: http://docs.openstack.org/developer/mistral/dsl/dsl_v2.html#std-ssh