Doing canary releases with Galaxy

I’d like to find a way to do a canary release with a galaxy deployment. So last.mycompany.com gets 90% and next.mycompany.com gets 10% of the traffic to www mc com. Is there a common pattern for this? I get I can deploy somewhere else and do the reverse proxying myself but was hoping to do this with galaxy features and possibly some CDN (or like) features if applicable.