[hcm]

Another open-source alternative is Sentry (https://getsentry.com/), which supports multiple languages and frameworks. A hosted version is also available.

The Ruby support in Sentry currently isn't quite as good as the Python support, but it's not bad at all, and constantly improving.

[bruth]

I second using Sentry, and it has UDP support. Maybe a few Ruby devs can just improve the Sentry Ruby client?

[marc_omorain]

I third using Sentry. I love it. David has been making huge improvements in the Ruby client in recent weeks.