Sentry Ruby Setup

Install and configure Sentry in Ruby projects.

Invoke This Skill When

User asks to "add Sentry to Ruby" or "install Sentry" in a Ruby app
User wants error monitoring, logging, or tracing in Ruby
User mentions "sentry-ruby" gem or Ruby on Rails

Important: The configuration options and code samples below are examples. Always verify against docs.sentry.io before implementing, as APIs and defaults may have changed.

Requirements

Ruby 2.4+ or recent JRuby versions

Install

Add to Gemfile:

gem "sentry-ruby"

# For profiling, add ONE of:
gem "stackprof"  # SDK 5.9.0+ — works on all Ruby versions
# gem "vernier"  # SDK 5.21.0+ — requires Ruby 3.2.1+, better for multi-threaded servers
                 # Also requires: config.profiler_class = Sentry::Vernier::Profiler

Then run:

bundle install

Configure

Initialize as early as possible:

require "sentry-ruby"

Sentry.init do |config|
  config.dsn = "YOUR_SENTRY_DSN"
  config.send_default_pii = true
  
  # Breadcrumbs from logs
  config.breadcrumbs_logger = [:sentry_logger, :http_logger]
  
  # Tracing
  config.traces_sample_rate = 1.0
  
  # Profiling (requires stackprof or vernier gem)
  config.profiles_sample_rate = 1.0
  # config.profiler_class = Sentry::Vernier::Profiler  # Uncomment if using vernier
  
  # Logs
  config.enable_logs = true
end

Rails Integration

For Rails, add to config/initializers/sentry.rb:

Sentry.init do |config|
  config.dsn = ENV["SENTRY_DSN"]
  config.send_default_pii = true
  config.breadcrumbs_logger = [:active_support_logger, :http_logger]
  config.traces_sample_rate = 1.0
  config.profiles_sample_rate = 1.0
  config.enable_logs = true
end

Rails-specific Gems

# Gemfile
gem "sentry-ruby"
gem "sentry-rails"  # Rails integration
gem "sentry-sidekiq"  # If using Sidekiq
gem "sentry-delayed_job"  # If using Delayed Job
gem "sentry-resque"  # If using Resque

Configuration Options

Option	Description	Default
`dsn`	Sentry DSN	`nil` (SDK no-ops without it)
`send_default_pii`	Include user data	`false`
`traces_sample_rate`	% of transactions traced	`nil` (tracing disabled)
`profiles_sample_rate`	% of traces profiled	`nil` (profiling disabled)
`enable_logs`	Send logs to Sentry	`false`
`environment`	Environment name	`"development"` (checks `SENTRY_CURRENT_ENV`, `SENTRY_ENVIRONMENT`, `RAILS_ENV`, `RACK_ENV` in order)
`release`	Release version	Auto-detected

Breadcrumb Loggers

Logger	Description
`:sentry_logger`	Sentry's own logger
`:http_logger`	HTTP request breadcrumbs
`:redis_logger`	Redis command breadcrumbs
`:active_support_logger`	Rails ActiveSupport (Rails only)

Environment Variables

SENTRY_DSN=https://xxx@o123.ingest.sentry.io/456
SENTRY_AUTH_TOKEN=sntrys_xxx
SENTRY_ORG=my-org
SENTRY_PROJECT=my-project

Verification

# Capture test message
Sentry.capture_message("Test message from Ruby")

# Or trigger intentional error
1 / 0

Troubleshooting

Issue	Solution
Errors not appearing	Ensure `Sentry.init` called early, check DSN
No traces	Set `traces_sample_rate` > 0
No profiles	Add `stackprof` gem, set `profiles_sample_rate`
Rails errors missing	Use `sentry-rails` gem instead of `sentry-ruby`

sentry-ruby-setup

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