nusenu:
Due to this last sentence I'm not sure if you want to convey availability (only xx% of resources are available to tor) or usage (tor uses only xx% of the resources it has available)?
The latter - Tor uses only xx% of the resources it has available. It might help by knowing where capacity is available for extra services if and when required by the Tor Project. Just Saying.
since contactInfo is rather static/long term and the used resources can change very quickly I don't think it is a good fit to put into the ContactInfo
but I added the RelayBandwidthRate setting consideration to the uplinkbw field.