Installing the New Relic Gem

New Relic[59] is a popular application performance monitoring (APM) service that captures near real-time data about your web application’s performance. You can use this data to monitor, troubleshoot, and tune a production web server.

New Relic’s advantage over the other tools you’ve learned about is its ability to work with complete production systems, which may include more than one application. The JVM tools you used in Chapter 6, Managing a JRuby Application work specifically with a single process, but a production app is usually composed of multiple processes for handling web requests, running background jobs, and more. With New Relic, you’ll passively monitor your entire system. You’ll hope that nothing ...

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