So much to know.. AppSignal (from blog home page): AppSignal Blog AppSignal APM combines performance monitoring and error tracking in one clear interface

So much to know.. AppSignal (from blog home page): AppSignal Blog AppSignal APM combines performance monitoring and error tracking in one clear interface. For Ruby (on Rails), Elixir and Node.js. Strong Migrations (from github README): Strong Migrations Catch unsafe migrations in development Detects potentially dangerous operations Prevents them from running by default Provides instructions on safer ways to do what you want Supports PostgreSQL, MySQL, and MariaDB Battle-tested at Instacart That's not what I'd mentally associate with 'strong' but hey it's their naming choice. Unless it does migrations without downtime, it's not interesting to me.