Ruby
Making the Most of Your Logs in Rails
It’s easy to get going with logging in Rails, but hard to master. Learn log levels, tagged and structured logging, and how to get the most from your logs.
APM Academy
Generating Random Numbers in Ruby: rand, Random & SecureRandom
Learn every way to generate random numbers in Ruby: rand and ranges, seeded Random instances for tests, and SecureRandom for tokens, UUIDs, and passwords.
Ruby
How to Use Shoulda Matchers with RSpec for Ruby on Rails
Set up shoulda-matchers 8 with RSpec on Rails 8.1: install and configure the gem, fix the validate_presence_of NoMethodError, and use grouped matcher tables.
Ruby
Sidekiq for Ruby on Rails: Setup, Jobs & Monitoring (2026)
Set up Sidekiq 8 in a Rails app, write and enqueue background jobs, weigh Sidekiq against Solid Queue, and monitor queue latency, failures, and memory.
Ruby
Custom Exceptions in Ruby: Classes, Messages & Hierarchies
Learn how to define custom exception classes in Ruby: inherit from StandardError, set default messages, add context, and group errors into hierarchies.
Ruby
Devise for Ruby on Rails: Setup, Modules & Rails 8 Auth
Devise is a full-featured Rails authentication gem built on Warden. Install it, use its 10 modules, and see when to pick it over Rails 8’s built-in auth.
Ruby
Handling Exceptions in Grape for Ruby: rescue_from and error!
Learn how to handle exceptions in a Grape API: rescue_from handlers, error! responses, validation errors, and custom error classes, verified on Grape 3.3.
AppSignal
Visualize Data Your Way, with Intelligence Dashboards Built for Your Stack
When you're troubleshooting in production, the right charts should already be in front of you. AppSignal dashboards now give you more control over layout, while Intelligence dashboards, Apdex, AppSignal MCP, and the CLI help you connect revisions, errors, throughput, and more.
AI Development
Add an App With Your Coding Agent
Give your coding agent one prompt to install AppSignal, then follow its progress as your app starts reporting.
Ruby
Rails 8 Guide: Features, Requirements & Upgrade Path (2026)
What Rails 8 ships and requires: built-in authentication, Solid Queue, Kamal 2, and production SQLite, plus support timelines and an upgrade checklist.
AppSignal
Distributed Tracing Is Now in Beta for Ruby, PHP, and Python
One trace across every service a request touches, including the Sidekiq job your Rails request just enqueued. In beta for Ruby, Python, and PHP, and here’s how to turn it on.
AppSignal
AppSignal Intelligence Just Got More Rails Context
We’re taking our partnership with Chris Oliver one step further: 10 Ruby and Rails tutorials, made with GoRails, now in the context store AppSignal Intelligence reads.
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- An Introduction to Testing LiveView in Elixir
- Ruby's Hidden Gems: Bullet
- AppSignal Error Tracking 2.0
- New Feature: Line-of-code-based Error Grouping
- Ruby Pattern Matching: case/in, Find Patterns, and the Pin Operator
- A Guide to Hot Code Reloading in Elixir
- How to Get Started with Prisma ORM for Node.js and PostgreSQL
- Building Aggregates in Elixir and PostgreSQL
- General Ruby on Rails Problems and Takeaways
- How to Monitor and Optimize Your Database Performance: A Practical Guide
- Adding Kubernetes Metadata to Your AppSignal Errors
- How to Test WebSocket Clients in Elixir with a Mock Server
- The Wolf Pack Tactic for Monitoring Slow APIs
- Performance, Stress, and Load Tests in Rails
- Uptime Monitoring: A One-week Project, a Decade In the Making
- Monitoring Memory Usage for Erlang and Elixir Applications
- Integrating AppSignal With Microsoft Teams
- Launching Uptime Monitoring In AppSignal
- Zero-touch SaaS Bookkeeping with Stripe and Moneybird
- Sidekiq Unique Jobs: Three Ways to Avoid Duplicates
- New Features: Heroku Errors and a Magic Dashboard
- A Quick Guide to CO2 Offsetting for Startups
- Linting Ruby Code
- Node.js's Underrated Combo: Passport and CASL
- Ruby on Rails Controller Patterns and Anti-patterns
- AppSignal Now Monitors Koa and All Your Cascading Middleware
- Exposing More Public Endpoints for Sending Metrics and Errors to AppSignal
- Engineering for Performance: Ghost Queries
- The Easiest Way to Monitor Ruby: Automatic Instrumentation
- Powerful Caching with Redis for Node.js Applications
- New Feature: Searching Through Samples in AppSignal
- Announcing AppSignal for Ruby Gem 3.0!
- Using Webpacker in Your Ruby on Rails Application — a Deep Dive
- Ruby on Rails View Patterns and Anti-patterns
- Improving Node.js Application Performance With Clustering
- RBS: A New Ruby 3 Typing Language in Action
- AppSignal for Elixir Integration 2.1 Released
- How Absinthe Uses Compilation Callbacks for Schema Validation in Elixir
- Node.js Garbage Collection: Heap Statistics Magic Dashboard
- Ruby Modules and Mixins: include, extend, prepend, and Rails Concerns
- Microservices Monitoring: Using Namespaces for Data Structuring
- Top 5 Elixir Blog Posts in 2020 from AppSignal
- Top 5 JavaScript Blog Posts in 2020 from AppSignal
- Top 5 Ruby Blog Posts in 2020 from AppSignal
- New Magic Dashboard for Ruby on Rails: ActionMailer
- Setting Up AppSignal Monitoring for a Ruby on Rails Application
- The Easiest Way to Monitor Node.js: Automatic Instrumentation
- Building a Multi-tenant Ruby on Rails App With Subdomains
- Fast & Curious: Find and Fix Slow Queries & API Requests
- Server-side Rendering in JavaScript: A Modern Approach
- Ruby on Rails Model Patterns and Anti-patterns
- Announcing AppSignal for Elixir 2.0
- Understanding Associations in Elixir's Ecto
- Structuring Monitoring Data in Monolithic Applications With Namespaces
- Setting Up Triggers and Alerts From Graphs in AppSignal
- Triggers in AppSignal: Already Powerful — Now Easy To Set Up 🚀
- JavaScript Internals: Garbage Collection
- AppSignal is Free for Open-Source Software & "For Good" Projects
- Capabilities of Elixir's Logger
- Launching AppSignal Monitoring for Node.js 1.0
- Exploring Node.js Async Hooks
- Monitoring Any System with StatsD and AppSignal's Standalone Agent
- The Diagnose: How Support Works at AppSignal
- Rails Concerns: To Concern Or Not To Concern
- Improved Pagerduty Integration with Detailed Alerts
- Node.js Resiliency Concepts: Recovery and Self-Healing
- Going from Consulting to SaaS
- Getting Started With Web Vitals in Next.js
- Testing the Tricky Parts of an Absinthe Application
- Identifying and Resolving a Kafka Issue With AppSignal
- Security Best Practices for Node.js
- AppSignal Ruby Gem 2.11: Active Job and Friends
- AppSignal Now Automatically Instruments Apollo for Node.js Applications
- Introduction to Ruby on Rails Patterns and Anti-patterns
- AppSignal Now Supports Redis for Node.js Out of the Box
- The State of Elixir HTTP Clients
- Node.js Resiliency Concepts: The Circuit Breaker
- Building State Machines in Elixir with Ecto
- Scaling Queue Workers Efficiently with AppSignal Metrics
- How AppSignal Monitors Their Own Kafka Brokers
- A Deep Dive Into V8
- New Feature: Add Custom Metrics For Node.js in AppSignal
- Best Practices for Background Jobs in Elixir
- Git is About Communication
- Using Service Objects in Ruby on Rails
- A Major Overhaul of AppSignal Dashboards: Powerful and Easy to Use
- New feature: PostgreSQL Magic Dashboard in AppSignal for Node.js
- Performance and N+1 Queries: Explained, Spotted, and Solved
- Building APIs With GraphQL in Your Node.js Application
- AppSignal Adds Next.js Integration - Automatically Adds Web Vitals Monitoring
- Developer Dilemmas Are Now Online
- Using Mnesia in an Elixir Application
- JavaScript Growing Pains: From 0 to 13,000 Dependencies
- New Integration: PostgreSQL Instrumented for Node.js
- Developer Dilemmas are Coming Online Soon
- Quickly Duplicate Triggers Across Apps in AppSignal
- Avoiding Memory Leaks in Node.js: Best Practices for Performance
- RailsConf 2020.2 Couch Edition
- JavaScript Error Tracking with AppSignal v1.3.0 is Here
- Configuring your Elixir Application at Runtime with Vapor
- Elixir Package 1.13: Phoenix LiveView Helpers and Updated Typespecs
- Official AppSignal Discord Integration is Here
- New AppSignal Feature: Graph Builder
- Dissecting Rails Migrations: Anatomy, Rollbacks, and Errors (Rails 8.1)
- Ride Down Into JavaScript Dependency Hell
- The Citadel Architecture at AppSignal
- AppSignal Now Supports Node.js: Roadmap for the Coming Weeks
- Changing the Approach to Debugging in Ruby with TracePoint
- What's The Difference Between Monitoring Webhooks and Background Jobs
- How to Use gRPC in Elixir
- Facade Pattern in Rails for Performance and Maintainability
- Building Compile-time Tools With Elixir's Compiler Tracing Features
- Building a Rails App With Multiple Subdomains
- Elixir Package 1.12: Phoenix 1.5 Support & Better Channel Error Handling
- Hostname Filter for Anomaly Detection Host Triggers
- UI/UX Updates: Faster and Smoother Sample Navigation in AppSignal
- Migrating Production Data in Elixir
- Effective Profiling in Google Chrome
- How to Monitor Your Host Metrics Automatically
- Getting Started With System Tests in Rails With Minitest
- AppSignal Ruby Gem 2.10: Better Diagnose (And More)
- Monitoring the Erlang VM With AppSignal's Magic Dashboard
- How to Get Your Elixir Application Ready for CI/CD
- JavaScript Error Tracking v1.1.0
- Rails is Fast: Optimize Your View Performance
- structure.sql vs schema.rb: Choosing a Rails Schema Format
- Top 10 AppSignal Blog Posts in 2019
- How to Use Broadway in Your Elixir Application
- Configurable Ruby Modules: The Module Builder Pattern
- JavaScript Errors: An Exceptional History - Part II
- Caching with Elixir and ETS
- How to Read Performance Metrics in AppSignal
- Sidekiq Optimization and Monitoring
- JavaScript Errors: An Exceptional History
- Launching JavaScript Error Tracking v1.0.
- Typespecs and Behaviours in Elixir
- Introducing area charts for custom dashboards.
- How We Tracked Down an Exception Without Errors: A Detective Story
- Ruby Templating: Baking an Interpreter
- Migrate to our new Slack App!
- TL;DR: Our new logo
- Flags, Seeds and Idempotency: Database Tooling with Elixir
- The Inherited Hook Method in Ruby - and More Parenting Lessons
- New Sample Page Graphs and Navigation
- Type Checking in Ruby — Check Yo Self Before You Wreck Yo Self
- Cleaning Up Ruby Strings 13 Times Faster
- Multiplayer Go with Elixir's Registry, PubSub and dynamic supervisors
- Digging Deeper into Ruby Templating: The Parser
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- JavaScript Iterators and Iterables
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- Introducing our Clubhouse integration
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- New Magic Dashboard: Heroku Postgres
- Doing Background Work Using a Native Elixir Approach
- Up the Ancestor Chain with method_missing
- Kafka and Ruby, a Sidekiq Lovestory
- We've got your back at RailsConf
- More personal email notification preferences
- Routing in Phoenix Umbrella Apps
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- Memory Magic Dashboard
- Pinned apps
- Introducing Magic Dashboards
- Object Marshalling in Ruby
- Revamped dashboards!
- Iteration, Recursion, and Tail-call Optimization in Elixir
- Improved navigation for better feature discovery.
- Ruby's Hidden Gems, StringScanner
- Diving into Ruby's #dup and #clone
- Pouring Protocols in Elixir
- Monitoring MongoDB Replicaset Lag with AppSignal
- Introducing our Google Hangouts Chat integration
- Unraveling Classes, Instances and Metaclasses in Ruby
- Introducing our Asana integration
- An instrumental intro to GraphQL with Ruby
- Serving Plug - Building an Elixir HTTP server from scratch
- Bindings and Lexical Scope in Ruby
- Elixir package 1.9: Improved Erlang error & Container memory support
- Ruby gem 2.8 - Container memory & JRuby on Alpine Linux support
- Don't be mean: Statistical means and percentiles 101
- Fibers and Enumerators in Ruby - Turning Blocks Inside Out
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- Testing Asynchronous Threads in Ruby
- Building a Ruby C Extension From Scratch
- The innards of a RubyGem
- Hot Code Reloading in Elixir
- ActiveRecord vs. Ecto Part Two
- Improved Navigation
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- ActiveRecord vs. Ecto Part One
- #to_s or #to_str? Explicitly casting vs. implicitly coercing types in Ruby
- How OTP Applications are structured
- Differences Between #nil?, #empty?, #blank?, and #present?
- Push and Pub/Sub in Ruby
- Lists vs Tuples in Elixirs
- Rails Collection Caching
- Elixir package 1.8: Improvements!
- Ruby gem 2.7: Improvements and bug fixes
- Changing the Way Ruby Creates Objects
- Ruby Magic Summer Special: The Best of AppSignal Academy
- Parsing Numbers in Elixir
- JavaScript-sprinkled Rails Applications
- Elixir integration 1.7 released
- Under the Hood: “Slurping” and Streaming Files in Ruby
- AppSignal Dashboard: Live updating insights
- Rebooting the Luftschiff!
- Caching counters with ActiveRecord's counter caches
- Deconstructing Elixir's GenServers
- Ruby's redo, retry and next keywords
- Enumerable and Enumerator in Ruby: each, Lazy, and Custom Classes
- Speeding up your app’s navigation with Turbolinks
- Ruby’s ensure, retry, and raise: Retrying and Reraising Exceptions
- Elixir integration 1.6: The GDPR release!
- General Data Protection Regulation (GDPR)
- Ruby gem 2.6: The GDPR release!
- Client-side caching in Rails: conditional GET requests
- Post-mortem: April 19th, 2018
- Rails' built-in cache stores: an overview
- New GitHub integration
- Rescuing Exceptions in Ruby: raise, rescue & retry
- AppSignal UI updates
- Elixir integration 1.5 released
- Russian doll caching in Rails
- Understanding system load and load averages
- Fragment caching in Rails
- Understanding CPU statistics
- Benchmarking Ruby Code
- Inspecting data in Ruby
- Comparing host metrics
- Syntactic sugar methods in Ruby
- Ruby gem 2.5 - JRuby support!
- Debugging Exceptions in Rails: Common Errors and Fixes
- Improved host metrics and alerts
- How to Read Ruby Stack Traces: Backtraces, Causes and Fixes
- Track cache hits with custom metrics
- Elixir integration 1.4 released
- Ruby gem 2.4 - FreeBSD support and more exceptions!"
- Koos: keeping others off support
- Better, more and more specific notification options
- Two-factor authentication
- (Mass) Change incident status
- Introducing Anomaly detection (Beta)
- Improved Snapshots of your apps
- Supervisors: Building fault-tolerant Elixir applications
- Elixir integration 1.3 released
- A look at how Ruby interprets your code
- Improved Slack notifications
- Gem 2.3 - ActionCable!
- Concurrency Deep Dive: Event loops
- Demystifying processes in Elixir
- Gem 2.2 - Custom namespaces!
- Concurrency Deep Dive: Multi-threading
- Elixir integration 1.2 released
- Elixir integration 1.1 released
- Concurrency Deep Dive: Multi-process
- Launching AppSignal for Elixir
- Gem 2.1 released - Alpine Linux support!
- Documentation updates
- Running Rack: How Ruby HTTP servers run Rails apps
- Escaping Characters in Ruby Strings and Regular Expressions
- Learning how to become a product business
- Review active browser sessions
- Add custom markers from any graph
- Building a 30 line HTTP server in Ruby
- Custom Markers
- Gem 2.0 released 🎉
- Rebasing a complex branch in Git
- Introducing: A new layout for AppSignal
- Gem 1.3: Giving Sinatra some love
- How to tame your growing users table
- Introduction to Garbage Collection (Part II)
- Host metrics in samples
- Introduction to Garbage Collection (Part I)
- Monitor MongoDB (query) load with Custom Metrics
- New event timeline
- Gem 1.2: Host metrics
- Gem version 1.1
- Upgrading to Mongoid 5 / mongo-ruby-driver
- Mastering Concurrency
- Introducing Graph Toggles
- Stroopwafels and how to eat them
- How to use custom metrics
- Getting high on our own supply
- Shipped it: A partnership with the Ruby on Rails podcast
- Event type graphs
- AppSignal agent release
- Phabricator integration
- PagerDuty integration
- OpsGenie integration
- Five Signs to Recognize a Future Customer
- Gem version 0.11.13 released
- Custom notifications with Zapier
- Automated screenshots using Capybara and Selenium
- Padrino support
- Issue states, notification settings & interface updates
- Introducing the Intercom integration beta
- Handling VAT with Stripe: Follow up
- Introducing the JIRA beta
- Official Sinatra support
- Introducing the Zapier beta (No Official Support Since 2017)
- GitLab integration
- Gem version 0.11
- AppSignal integrates with Pivotal Tracker, GitHub & Trello
- First steps towards a new front-end architecture
- Handling VAT with Stripe
- Post-Mortem: Why our gem disabled itself
- Gem version 0.10
- Consistent API
- Flowdock integration
- Gem version 0.9
- Our response to Heartbleed
- Stroopwafels as a Service
- Set notification settings per application
- Vastly improve performance for MongoDB, Mongoid and Sidekiq
- Refactoring design
- Error, performance and deploy notifications in Slack
- We now monitor your background jobs
- Realtime graphs from MongoDB with aggregations
- AppSignal API
- Error request tagging
- AppSignal and Shelly Cloud partner up
- Improved graphs and snapshots
- Taming our MongoDB database size.
- AppSignal Sunday
- Poor man's usability testing
- Developers and designers: an arranged marriage.
- Gem version 0.6
- A quick post about reducing MongoDB queries
- User test
- Designing AppSignal
- Opening up shop
- 401: Unauthorized
- Filtering sensitive data from params
- Better graphs, event tree & new hosts section
- jQuery toggle() is slow, JavaScript to the rescue
- Welcome to AppSignal!
$appsignal install
AppSignal monitors your apps
AppSignal provides insights for Ruby, Rails, Elixir, Phoenix, Node.js, Express and many other frameworks and libraries. We are located in beautiful Amsterdam. We love stroopwafels. If you do too, let us know. We might send you some!