metrixwire

https://github.com/metrixwire/ruby

Zero-config application performance monitoring for Ruby. Add the gem, set METRIXWIRE_KEY, and every request, database query, outbound HTTP call and cache op is instrumented automatically — no manual spans, no middleware to wire up. Detects N+1 queries, slow endpoints, slow queries and more. Non-blocking: traces are batched off the request path.