Comment 2 for bug 1412388

Hi,
please help me
I am testing autoscaling with heat and ceilometer .For the ceilometer alarm I would like to use the outputs of a shell script( like a function which return a number and the scale up/scale down will depends on this number according to ceilometer)

So how can I manage the communication betwen my shell script and ceilometer?
In others words ,I have to call to the script or the ouputs of my script somewhere while creating my new measure.Must I do settings in the ceilometer configuration to includ my script file?