each metric is output is identified by 2 variables %s.%s % (name,metric)
name is created by
name = instance.name.lower().replace('-', '_')
if name has spaces the metrics fail to be picked up by the alarm setup as spaces are not filtered
I ended up defaulting the name to a fixed string 'lb', as I am re using the alert syntax between load balancer checks.
For setting up checks I do not see the value of changing the name of the metrics based on the load balancer the name of the metrics should remain the same regardless of the load balancer.