AWS ruby sdk for Async non blocking calls

I want to publish custom application level metrics to be pushed to aws cloudwatch service. (http://ift.tt/1wl6yXS), so that I can see all the metrics both system and application level custom metrics in AWS dashboard. This way I don't have to use third party monitoring solution like graphite etc.

The thing here is that I don't want my application to get slowed down by making blocking calls to push metrics. Is there way I can make async calls (fire and forget) using aws ruby sdk? I know there are Async client in Java SDK but can't find anything for ruby sdk.