Speed is more than a feature, it's a requirement. Capture the average, 95th percentile response time, and throughput for all your requests. Find out where to focus your optimizations on, and the line in your code causing the slowing down.

Don't waste time tailing log files. Supervise Delayed::Job, Resque, Sidekiq and cron jobs. Have knowledge of the average runtime per kind of job, CPU and error rate. As for requests, get detailed insights about the slowest SQL queries.

Discover issues before your customers do. Be notified by email or in your favorite Slack channel whenever a new kind of exception happens. Get the frequency, backtrace and all the information you need to eradicate bugs in your app.