You might like Honeybadger:
https://www.honeybadger.io/Full text search, a lightning-fast drill-down UI, and advanced collaboration tools make Honeybadger the best option to manage Rails errors. IMHO
Since our public launch we've gained a lot of traction. Many of the apps we monitor are household names. For the latest news: @honeybadgerapp.
Sorry for the blatant plug, but you asked. :)