Our hosting partners, Blue Box, up to the north of us1 have recently published a series of articles about managing larger Ruby on Rails applications titled, Managing Real World Rails Apps at Massive Scale (also see parts 1, 2, and 3). These posts came out of a few interviews at RailsConf 2012. Definitely worth reading through to get a few ideas on how best to monitor and evaluate application performance.
1 We’ll forgive them for being fans of the Seattle Flounders (Sounders). ;-)