* Add service target metric
* Add service min replicas metric
* Add scale type metric
These combined allow new auto-scaling modes and parameters
for OpenFaaS Pro customers.
Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
The queue type now resides in the provider, so that there is
no risk of a circular reference.
Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>