Reports unhandled exceptions, Rails.error reports, failed ActiveJob and Sidekiq jobs, and failures the application handled, with who was affected, to Dev Bench. Fingerprints and counts in-process and sends one small request a minute; detail is uploaded only when Dev Bench asks for it, scrubbed first. Set DEVBENCH_DSN and it hooks itself into Rails. Adds no dependencies beyond the standard library, never alters a response body, and never raises: a diagnostics gem that can fail a request is worse than no diagnostics.