Service annotations missing, so not possible to use prometheus autodiscovery

[gpkc]

As far as I understand, it's not possible to set e.g. prometheus.io/port and prometheus.io/scrape on the Service annotations currently, and prometheus autodiscovery would look for those. It's possible to set on the pod, but this is not ideal since it could cause metrics to be duplicated momentarily if two copies coexist, and since the pod port is not directly configurable as well, and could change in the future

[danihodovic]

Would you like to open a pull-request?

[gpkc]

@danihodovic Sure! #338